10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

(Mark One)

þ	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
	For the quarterly period ended September 30, 2012

or

o	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
	For the transition period fromto

Commission file number 001-14989

WESCO International, Inc.

(Exact name of registrant as specified in its charter)

Delaware (State or other jurisdiction of incorporation or organization)	25-1723342 (I.R.S. Employer Identification No.)
225 West Station Square Drive Suite 700 Pittsburgh, Pennsylvania (Address of principal executive offices)	(412) 454-2200 (Registrant's telephone number, including area code)

N/A

(Former name, former address and former fiscal year, if changed since last report) 

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for at least the past 90 days. Yes þ No o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes þ No o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer,” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer þ	Accelerated filer o	Non-accelerated filer o	Smaller reporting company o
		(Do not check if a smaller reporting company)

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes o No þ

As of October 29, 2012, WESCO International, Inc. had 43,746,966 shares of common stock outstanding.

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

QUARTERLY REPORT ON FORM 10-Q

Table of Contents

	Page
PART I - FINANCIAL INFORMATION
Item 1. Financial Statements
Condensed Consolidated Balance Sheets as of September 30, 2012 and December 31, 2011 (unaudited)	2
Condensed Consolidated Statements of Income and Comprehensive Income for the three and nine months ended	3
September 30, 2012 and 2011 (unaudited)
Condensed Consolidated Statements of Cash Flows for the nine months ended September 30, 2012 and 2011	4
(unaudited)
Notes to Condensed Consolidated Financial Statements (unaudited)	5
Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations	17
Item 3. Quantitative and Qualitative Disclosures About Market Risk	23
Item 4. Controls and Procedures	23
PART II - OTHER INFORMATION
Item 1. Legal Proceedings	24
Item 6. Exhibits	24
Signatures and Certifications	25
EX-31.1
EX-31.2
EX-32.1
EX-32.2
EX-101 INSTANCE DOCUMENT
EX-101 SCHEMA DOCUMENT
EX-101 CALCULATION LINKBASE DOCUMENT
EX-101 LABELS LINKBASE DOCUMENT
EX-101 PRESENTATION LINKBASE DOCUMENT
EX-101 DEFINITION LINKBASE DOCUMENT

1

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED BALANCE SHEETS

(unaudited)

Amounts in thousands, except share data	September 30, 2012			December 31, 2011
Assets
Current Assets:
Cash and cash equivalents	$	107,637		$	63,869
Trade accounts receivable, net of allowance for doubtful accounts of $20,496 and $21,590 in 2012 and 2011, respectively	1,020,454			939,422
Other accounts receivable	48,246			43,442
Inventories, net	662,764			626,967
Current deferred income taxes	29,431			28,217
Income taxes receivable	11,284			12,206
Prepaid expenses and other current assets	26,109			23,297
Total current assets	1,905,925			1,737,420
Property, buildings and equipment, net of accumulated depreciation of $195,051 and $190,385 in 2012 and 2011, respectively	140,998			133,550
Intangible assets, net	204,572			156,874
Goodwill	1,127,001			1,008,127
Deferred income taxes	17,926			18,090
Other assets	23,572			24,391
Total assets	$	3,419,994		$	3,078,452
Liabilities and Stockholders’ Equity
Current Liabilities:
Accounts payable	$	693,177		$	642,777
Accrued payroll and benefit costs	63,103			76,915
Short-term debt	22,848			3,261
Current portion of long-term debt	2,137			3,150
Bank overdrafts	57,681			47,489
Other current liabilities	71,090			72,254
Total current liabilities	910,036			845,846
Long-term debt, net of discount of $173,685 and $175,908 in 2012 and 2011, respectively	696,758			642,922
Deferred income taxes	244,175			223,005
Other noncurrent liabilities	24,495			20,769
Total liabilities	$	1,875,464		$	1,732,542
Commitments and contingencies (Note 6)
Stockholders’ Equity:
Preferred stock, $.01 par value; 20,000,000 shares authorized, no shares issued or outstanding	—			—
Common stock, $.01 par value; 210,000,000 shares authorized, 57,420,260 and 57,021,523 shares issued and 43,717,573 and 43,424,031 shares outstanding in 2012 and 2011, respectively	575			571
Class B nonvoting convertible common stock, $.01 par value; 20,000,000 shares authorized, 4,339,431 issued and no shares outstanding in 2012 and 2011, respectively	43			43
Additional capital	1,053,493			1,036,867
Retained earnings	1,066,216			891,789
Treasury stock, at cost; 18,042,118 and 17,936,923 shares in 2012 and 2011, respectively	(600,059		)	(593,329		)
Accumulated other comprehensive income	24,354			10,057
Total WESCO International stockholders' equity	1,544,622			1,345,998
Noncontrolling interest	(92		)	(88		)
Total stockholders’ equity	1,544,530			1,345,910
Total liabilities and stockholders’ equity	$	3,419,994		$	3,078,452

The accompanying notes are an integral part of the condensed consolidated financial statements.

2

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME

(unaudited)

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
Amounts in thousands, except share data	2012			2011			2012			2011
Net sales	$	1,656,186		$	1,580,376		$	4,934,938		$	4,536,196
Cost of goods sold (excluding depreciation and amortization below)	1,317,432			1,264,745			3,940,762			3,627,666
Selling, general and administrative expenses	225,812			216,205			685,130			644,176
Depreciation and amortization	9,910			7,674			26,431			22,861
Income from operations	103,032			91,752			282,615			241,493
Interest expense, net	12,654			15,079			33,093			41,651
Income before income taxes	90,378			76,673			249,522			199,842
Provision for income taxes	26,987			22,783			74,259			58,440
Net income	63,391			53,890			175,263			141,402
Less: Net loss attributable to noncontrolling interest	(24		)	—			(4		)	—
Net income attributable to WESCO International, Inc.	$	63,415		$	53,890		$	175,267		$	141,402
Comprehensive income:
Foreign currency translation adjustment	10,652			(26,411		)	14,297			(16,685		)
Comprehensive income attributable to WESCO International, Inc.	$	74,067		$	27,479		$	189,564		$	124,717
Earnings per share attributable to WESCO International, Inc.
Basic	$	1.45		$	1.24		$	4.02		$	3.27
Diluted	$	1.25		$	1.11		$	3.43		$	2.84

The accompanying notes are an integral part of the condensed consolidated financial statements.

3

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(unaudited)

	Nine Months Ended
	September 30,
Amounts in thousands	2012			2011
Operating Activities:
Net income	$	175,263		$	141,402
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	26,431			22,861
Amortization of debt issuance costs	1,898			3,838
Amortization of debt discount	2,208			1,850
Deferred income taxes	21,934			7,702
Stock-based compensation expense	11,722			12,360
Loss on sale of property, buildings and equipment	439			171
Excess tax benefit from stock-based compensation	(5,560		)	(3,523		)
Interest related to uncertain tax positions	(3,288		)	1,581
Changes in assets and liabilities
Trade and other receivables, net	(64,017		)	(154,686		)
Inventories, net	(16,028		)	(44,155		)
Prepaid expenses and other current assets	9,129			(998		)
Accounts payable	38,540			110,550
Accrued payroll and benefit costs	(15,403		)	(2,686		)
Other current and noncurrent liabilities	6,415			(24,439		)
Net cash provided by operating activities	189,683			71,828
Investing Activities:
Capital expenditures	(19,469		)	(23,966		)
Acquisition payments, net of cash acquired	(201,123		)	(8,166		)
Proceeds from sale of assets	51			86
Net cash used in investing activities	(220,541		)	(32,046		)
Financing Activities:
Proceeds from issuance of short-term debt	21,388			—
Repayments of short-term debt	(2,129		)	—
Proceeds from issuance of long-term debt	740,450			464,981
Repayments of long-term debt	(691,202		)	(464,900		)
Debt issuance costs	(137		)	(4,248		)
Proceeds from the exercise of stock options	208			210
Excess tax benefit from stock-based compensation	5,560			3,523
Repurchase of common stock	(8,237		)	(6,250		)
Increase in bank overdrafts	10,192			12,999
Payments on capital lease obligations	(1,702		)	(1,110		)
Net cash provided by financing activities	74,391			5,205
Effect of exchange rate changes on cash and cash equivalents	235			(4,515		)
Net change in cash and cash equivalents	43,768			40,472
Cash and cash equivalents at the beginning of period	63,869			53,577
Cash and cash equivalents at the end of period	$	107,637		$	94,049
Supplemental disclosures:
Non-cash investing and financing activities:
Property, buildings and equipment acquired through capital leases	$	2,693		$	210
Issuance of treasury stock	—			960

The accompanying notes are an integral part of the condensed consolidated financial statements.

4

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(unaudited)

1. ORGANIZATION

WESCO International, Inc. and its subsidiaries (collectively, “WESCO”), headquartered in Pittsburgh, Pennsylvania, is a full-line distributor of electrical, industrial and communications maintenance, repair and operating (“MRO”) and original equipment manufactures (“OEM”) products, construction materials, and advanced supply chain management and logistics services used primarily in the industrial, construction, utility and commercial, institutional and government markets. We serve over 65,000 active customers globally, through approximately 400 full service branches and eight distribution centers located primarily in the United States, Canada and Mexico, with offices in 11 additional countries.

2. ACCOUNTING POLICIES

Basis of Presentation

The unaudited condensed consolidated financial statements of WESCO have been prepared in accordance with Rule 10-01 of Regulation S-X of the Securities and Exchange Commission (the “SEC”). The unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in WESCO’s 2011 Annual Report on Form 10-K filed with the SEC. The December 31, 2011 condensed consolidated balance sheet data was derived from audited financial statements but does not include all disclosures required by accounting principles generally accepted in the United States.

The unaudited condensed consolidated balance sheet as of September 30, 2012, the unaudited condensed consolidated statements of income for the three and nine months ended September 30, 2012 and 2011, respectively, and the unaudited condensed consolidated statements of cash flows for the nine months ended September 30, 2012 and 2011, respectively, in the opinion of management, have been prepared on the same basis as the audited consolidated financial statements and include all adjustments necessary for the fair statement of the results of the interim periods. All adjustments reflected in the unaudited condensed consolidated financial statements are of a normal recurring nature unless indicated. Results for the interim periods presented are not necessarily indicative of the results to be expected for the full year.

Reclassification

Certain prior period amounts have been reclassified to conform with the current period's financial statement presentation.

Fair Value of Financial Instruments

The Company measures the fair value of financial assets and liabilities based on the guidance of ASC 820, "Fair Value Measurements and Disclosures," which defines fair value, establishes a framework for measuring fair value, and expands disclosures about fair value measurements.

ASC 820 establishes a fair value hierarchy, which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. ASC 820 describes three levels of inputs that may be used to measure fair value:

Level 1 inputs are quoted prices in active markets for identical assets or liabilities.

Level 2 inputs include inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices in active markets for similar assets and liabilities, quoted prices for identical or similar assets or liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of assets or liabilities.

Level 3 inputs are unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions.

At September 30, 2012, the carrying value of WESCO’s 7.50% Senior Subordinated Notes due 2017 (the "2017 Notes") and 6.0% Convertible Senior Debentures due 2029 (the "2029 Debentures") was $494.9 million and the fair value was approximately $892.9 million. At December 31, 2011, the carrying value of WESCO’s 2017 Notes and 2029 Debentures was $495.0 million and the fair value was approximately $850.9 million. The fair value of WESCO’s 2017 Notes and 2029 Debentures is based on quoted prices in active markets and is therefore classified as Level 1 within the valuation hierarchy. The reported carrying amounts of WESCO’s other debt instruments approximate their fair values and are classified as Level 2 within the valuation hierarchy. Other debt instruments included in Level 2 are valued using a market approach, utilizing interest rates and other relevant information generated by market transactions involving similar instruments.

5

Recent Accounting Pronouncements

In July 2012, the Financial Accounting Standards Board (the "FASB"), issued updated guidance on the periodic testing of indefinite-lived intangible assets, other than goodwill, for impairment. This updated guidance will allow companies the option to first assess qualitative factors to determine if it is more-likely-than-not that an indefinite-lived intangible asset might be impaired and whether it is necessary to perform the quantitative impairment test required under current accounting standards. This guidance is effective for annual and interim impairment tests performed for fiscal years beginning after September 15, 2012. WESCO will adopt this guidance in 2013. Adoption of this guidance is not expected to have a material impact on WESCO's financial position, results of operations or cash flows.

3. ACQUISITIONS

The following table sets forth the consideration paid for acquisitions:

Nine Months Ended September 30	2012			2011
(In thousands)
Details of acquisitions:
Fair value of assets acquired	$	215,303		$	11,187
Fair value of liabilities assumed	(14,180		)	(3,021		)
Cash paid for acquisitions	$	201,123		$	8,166

2011 Acquisition of RECO, LLC

On March 14, 2011, WESCO Distribution, Inc. ("WESCO Distribution") completed its acquisition of RECO, LLC ("RECO"), an automation, controls, and electrical distributor located in the midwest and southeastern regions of the United States with approximately $25 million in annual sales. WESCO funded the purchase price paid at closing with cash and borrowings under the Receivables Facility. The purchase price was allocated to the respective assets and liabilities based upon their estimated fair values as of the acquisition date. The excess of the purchase price over the fair value of the net assets acquired has been allocated to goodwill valued at $6.0 million. Management believes the majority of goodwill will be deductible for tax purposes.

2012 Acquisitions of RS Electronics, Trydor Industries (Canada), Ltd., and Conney Safety Products, LLC

On January 3, 2012, WESCO Distribution, Inc. completed its acquisition of RS Electronics, a leading North American distributor of electronic and electrical products serving primarily the industrial, medical equipment, automotive, and contract manufacturing end markets with eight branches located in the midwest and southeastern United States and approximately $60 million in annual sales. WESCO funded the purchase price paid at closing with cash and borrowings under the Receivables Facility.

On July 5, 2012, WESCO completed its acquisition of Trydor Industries (Canada), Ltd. (“Trydor”) through one of its wholly-owned Canadian subsidiaries.  Trydor Industries (Canada), Ltd. is a full-line distributor of high-voltage electrical products and services addressing the transmission, substation and distribution network needs for utilities, independent power producers and utility contractors in Canada with approximately $35 million in annual sales.  WESCO funded the purchase price paid at closing with borrowings under the Revolving Credit Facility.

On July 10, 2012, WESCO Distribution completed its acquisition of Conney Safety Products, LLC (“Conney Safety”), a premier distributor of MRO safety products with approximately $85 million in annual sales.  WESCO funded the purchase price paid at closing with borrowings under the Receivables Facility.

6

For all 2012 acquisitions, the purchase price was allocated to the respective assets and liabilities based upon their estimated fair values as of the acquisition date. The purchase price allocation of RS Electronics was finalized in the first quarter of 2012. The purchase price allocation of Conney Safety and Trydor will be finalized during the fourth quarter of 2012. The excess of the purchase price over the fair value of the net assets acquired, including intangible assets, has been allocated to goodwill. The fair value of intangible assets was estimated by management and the allocation resulted in goodwill and intangible assets of $114.9 million and $57.0 million, respectively. Management believes the majority of goodwill will be deductible for tax purposes. The intangible assets for all 2012 acquisitions include customer relationships of $49.2 million amortized over 10 to 12 years, supplier relationships of $2.7 million amortized over 10 years and trademarks of $5.1 million. Certain trademarks have been assigned an indefinite life while others are being amortized over 4 to 15 years. No residual value is estimated for the intangible assets.

4. STOCK-BASED COMPENSATION

WESCO’s stock-based employee compensation plans are comprised of stock options, stock-settled stock appreciation rights, restricted stock units and performance-based awards. Compensation cost for all stock-based awards is measured at fair value on the date of grant, and compensation cost is recognized, net of estimated forfeitures, over the service period for awards expected to vest. The fair value of stock options and stock-settled appreciation rights is determined using the Black-Scholes valuation model. The fair value of restricted stock units is determined by the grant-date closing price of WESCO’s common stock. The forfeiture assumption is based on WESCO’s historical employee behavior that is reviewed on an annual basis. No dividends are assumed.

During the three and nine month periods ended September 30, 2012 and 2011, WESCO granted the following stock-settled stock appreciation rights, restricted stock units and performance-based awards at the following weighted average assumptions:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2012		2011		2012		2011
Stock-settled appreciation rights granted	850		15,156		257,932		399,330
Restricted stock units granted	2,400		—		74,724		53,852
Performance-based awards granted	—		—		46,804		—
Risk free interest rate	0.6	%	1.0	%	0.9	%	2.3	%
Expected life (in years)	5.0		5.0		5.0		5.0
Expected volatility	50	%	48	%	50	%	49	%

For the three and nine months ended September 30, 2012, the weighted average fair value per stock-settled appreciation right granted was $24.33 and $27.89, respectively. For the three and nine months ended September 30, 2011, the weighted average fair value per stock-settled appreciation right granted was $16.42 and $26.47, respectively. For the three and nine months ended September 30, 2012, the weighted average fair value per restricted stock unit granted was $62.49 and $64.27, respectively. For the nine months ended September 30, 2011, the weighted average fair value per restricted stock unit granted was $60.05. For the nine months ended September 30, 2012, the weighted average fair value per performance-based award granted was $75.72.

The following table sets forth a summary of stock options and stock-settled stock appreciation rights and related information for the nine months ended September 30, 2012:

	Awards		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (In Years)	Aggregate Intrinsic Value (In thousands)
Outstanding at December 31, 2011	4,266,533		$	39.64
Granted	257,932		64.12
Exercised	(697,037	)	32.46
Forfeited	(36,061	)	49.43
Outstanding at September 30, 2012	3,791,367		42.54		5.8	$	72,535
Exercisable at September 30, 2012	3,084,703		$	40.06	5.1	$	66,470

7

The following table sets forth a summary of restricted stock units and related information for the nine months ended September 30, 2012:

	Awards		Weighted Average Fair Value
Unvested at December 31, 2011	203,291		$	37.16
Granted	74,724		64.27
Vested	(78,305	)	25.37
Forfeited	(8,684	)	45.02
Unvested at September 30, 2012	191,026		$	52.24

Performance shares are awards for which the vesting will occur based on market or performance conditions. The following table sets forth a summary of performance-based awards for the nine months ended September 30, 2012:

	Awards		Weighted Average Fair Value
Unvested at December 31, 2011	—		—
Granted	46,804		$	75.72
Vested	—		—
Forfeited	(304	)	75.72
Unvested at June 30, 2012	46,500		$	75.72

The performance-based awards in the table above include 23,250 shares in which vesting of the ultimate number of shares underlying such awards will be dependent upon WESCO's total stockholder return in relation to the total stockholder return of a select group of peer companies over a three-year period. These awards are valued based upon a Monte Carlo simulation model, which is a valuation model that represents the characteristics of these grants. The probability of meeting the market criteria was considered when calculating the estimated fair market value on the date of grant. These awards were accounted for as awards with market conditions, which are recognized over the service period, regardless of whether the market conditions are achieved and the awards ultimately vest.

The fair value of the performance shares granted during the nine months ended September 30, 2012 were estimated using the following weighted-average assumptions:

Weighted Average Assumptions
Grant date share price	$	64.33
WESCO expected volatility	41.97		%
Peer group median volatility	33.40		%
Risk-free interest rate	0.40		%
Correlation	135.4		%

Vesting of the remaining 23,250 shares of performance-based awards in the table above will be dependent upon the three-year average growth rate of WESCO's net income. These awards are valued based upon the grant-date closing price of WESCO's common stock. These awards were accounted for as awards with performance conditions, in which stock-based compensation expense is recognized over the performance period based upon WESCO's determination of whether it is probable that the performance targets will be achieved.

8

WESCO recognized $3.2 million and $2.9 million of non-cash stock-based compensation expense, which is included in selling, general and administrative expenses, for the three months ended September 30, 2012 and 2011, respectively. WESCO recognized $11.7 million and $12.4 million of non-cash stock-based compensation expense, which is included in selling, general and administrative expenses, for the nine months ended September 30, 2012 and 2011, respectively. As of September 30, 2012, there was $21.4 million of total unrecognized compensation cost related to non-vested stock-based compensation arrangements for all awards previously made, of which approximately $3.4 million is expected to be recognized over the remainder of 2012, $11.4 million in 2013, $5.9 million in 2014 and $0.7 million in 2015.

During the nine months ended September 30, 2012 and 2011, the total intrinsic value of awards exercised was $22.4 million and $12.0 million, respectively. The total amount of cash received from the exercise of options was $0.2 million for both the nine months ended September 30, 2012 and 2011. The tax benefit associated with the exercise of awards for the nine months ended September 30, 2012 and 2011 totaled $5.4 million and $3.5 million, respectively, and was recorded as an increase to additional capital.

5. EARNINGS PER SHARE

Basic earnings per share are computed by dividing net income by the weighted average common shares outstanding during the periods. Diluted earnings per share are computed by dividing net income by the weighted average common shares and common share equivalents outstanding during the periods. The dilutive effect of common share equivalents is considered in the diluted earnings per share computation using the treasury stock method, which includes consideration of stock-based compensation and convertible debt.

The following table sets forth the details of basic and diluted earnings per share:

	Three Months Ended
	September 30,
	2012		2011
Net income attributable to WESCO International, Inc.	$	63,415	$	53,890
Weighted average common shares outstanding used in computing basic earnings per share	43,705		43,289
Common shares issuable upon exercise of dilutive equity awards	1,032		976
Common shares issuable from contingently convertible debentures (see below for basis of calculation)	6,036		4,206
Weighted average common shares outstanding and common share equivalents used in computing diluted earnings per share	50,773		48,471
Earnings per share attributable to WESCO International, Inc.
Basic	$	1.45	$	1.24
Diluted	$	1.25	$	1.11

	Nine Months Ended
	September 30,
	2012		2011
Net income attributable to WESCO International, Inc.	$	175,267	$	141,402
Weighted average common shares outstanding used in computing basic earnings per share	43,596		43,181
Common shares issuable upon exercise of dilutive equity awards	1,199		1,202
Common shares issuable from contingently convertible debentures (see below for basis of calculation)	6,262		5,400
Weighted average common shares outstanding and common share equivalents used in computing diluted earnings per share	51,057		49,783
Earnings per share attributable to WESCO International, Inc.
Basic	$	4.02	$	3.27
Diluted	$	3.43	$	2.84

For the three and nine months ended September 30, 2012, the computation of diluted earnings per share attributable to WESCO International, Inc. excluded 1.0 million and 1.2 million, respectively, of stock-settled stock appreciation rights at weighted average exercise prices of $64 per share and $62 per share, respectively. These amounts were excluded because their effect would have been antidilutive.

9

Because of WESCO’s obligation to settle the par value of the 6.0% Convertible Senior Debentures due 2029 (the “2029 Debentures”) and the previously outstanding 1.75% Convertible Senior Debentures due 2026 (the “2026 Debentures” and together with the 2029 Debentures, the “Debentures”) in cash upon conversion, WESCO is not required to include any shares underlying the Debentures in its diluted weighted average shares outstanding until the average stock price per share for the period exceeds the conversion price of the respective Debentures. At such time, only the number of shares that would be issuable (under the treasury stock method of accounting for share dilution) would be included, which is based upon the amount by which the average stock price exceeds the conversion price. The conversion price of the 2029 Debentures is $28.87. Share dilution is limited to a maximum of 11,949,513 shares for the 2029 Debentures. For the three and nine months ended September 30, 2012, the effect of the Debentures on diluted earnings per share attributable to WESCO International, Inc. was a decrease of $0.17 and $0.48, respectively. For the three and nine months ended September 30, 2011, the effect of the Debentures on diluted earnings per share attributable to WESCO International, Inc. was a decrease of $0.11 and $0.35, respectively.

6. EMPLOYEE BENEFIT PLANS

A majority of WESCO’s employees are covered by defined contribution retirement savings plans for their services rendered subsequent to WESCO’s formation. WESCO also offers a deferred compensation plan for select individuals. For U.S. participants, WESCO will make contributions in an amount equal to 50% of the participant’s total monthly contributions up to a maximum of 6% of eligible compensation. For Canadian participants, WESCO will make contributions in an amount ranging from 1% to 7% of the participant’s eligible compensation based on years of continuous service. In addition, employer contributions may be made at the discretion of the Board of Directors. For the nine months ended September 30, 2012 and 2011, WESCO incurred charges of $24.2 million and $19.5 million, respectively, for all such plans. Contributions are made in cash to defined contribution retirement savings plans. The deferred compensation plan is an unfunded plan. Employees have the option to transfer balances allocated to their accounts into any of the available investment options, including WESCO common stock.

7. COMMITMENTS AND CONTINGENCIES

WESCO is a co-defendant in a lawsuit filed in a state court in Indiana in which a customer alleges that WESCO sold defective products manufactured or remanufactured by others and is seeking monetary damages in the amount of approximately $50 million. WESCO has denied any liability, continues to believe that it has meritorious defenses and intends to vigorously defend itself against these allegations. Accordingly, no liability was recorded for this matter as of September 30, 2012. Furthermore, due to the uncertainty of this litigation, WESCO is not currently able to reasonably estimate the possible loss or range of loss from this legal proceeding.

8. INCOME TAXES

The effective tax rate for the three months ended September 30, 2012 and 2011 was 29.9% and 29.7% respectively, and the effective tax rate for the nine months ended September 30, 2012 and 2011 was 29.8% and 29.2%, respectively. WESCO’s three and nine month effective tax rates are lower than the federal statutory rate of 35% primarily due to benefits resulting from the recapitalization of Canadian operations, which are partially offset by nondeductible expenses, state taxes and foreign rate differences. The effective tax rate for the nine months ended September 30, 2012 and 2011 reflects beneficial discrete adjustments totaling $3.2 million and $2.1 million, respectively, primarily related to state taxes and changes in uncertain tax positions. The beneficial discrete adjustments in the effective tax rate for the three months ended September 30, 2012 and 2011 were immaterial.

The total amount of net unrecognized tax benefits were $20.1 million and $20.9 million as of September 30, 2012 and December 31, 2011, respectively. A related deferred tax asset in the amount of $23.1 million excluding interest was recorded in 2011. If these tax benefits were recognized in the consolidated financial statements, the portion of these amounts that would reduce WESCO’s effective tax rate would be $20.2 million and $19.7 million, respectively. This amount would be offset by a decrease in the corresponding deferred tax asset discussed above.

During the next twelve months, it is reasonably possible that the amount of unrecognized tax benefits will decrease by as much as $15.5 million (all of which will be offset by the reversal of a deferred tax asset) due to possible resolution of federal, state and/or foreign tax examinations and/or the expiration of statutes of limitations. Management does not expect this decrease to have an impact on the effective tax rate.

10

WESCO records interest related to uncertain tax positions as a part of interest expense in the consolidated statement of income. Penalties are recognized as part of income tax expense. As of September 30, 2012 and December 31, 2011, WESCO had an accrued liability for interest related to uncertain tax positions of $8.1 million and $11.4 million, respectively. During the nine months ended September 30, 2012, accrued interest and net interest expense decreased by $3.3 million primarily as a result of a favorable Internal Revenue Service appeals settlement in the first quarter of 2012 related to the years 2000 to 2006. There were no material penalties recorded during the three or nine months ended September 30, 2012 or 2011.

9. OTHER FINANCIAL INFORMATION

WESCO Distribution, a 100% owned subsidiary of WESCO International, Inc. ("WESCO International"), has outstanding $150.0 million in aggregate principal amount of 7.50% Senior Subordinated Notes due 2017 (the "2017 Notes"), and WESCO International has outstanding $344.9 million in aggregate principal amount of 2029 Debentures. The 2017 Notes are fully and unconditionally guaranteed by WESCO International on a subordinated basis to all existing and future senior indebtedness of WESCO International. The 2029 Debentures are fully and unconditionally guaranteed by WESCO Distribution on a senior subordinated basis to all existing and future senior indebtedness of WESCO Distribution.

Condensed consolidating financial information for WESCO International, WESCO Distribution and the non-guarantor subsidiaries is as follows:

11

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATING BALANCE SHEETS

(unaudited)

	September 30, 2012
	(In thousands)
	WESCO International, Inc.		WESCO Distribution, Inc.		Non-Guarantor Subsidiaries		Consolidating and Eliminating Entries			Consolidated
Cash and cash equivalents	$	3	$	75,673	$	31,961	$	—		$	107,637
Trade accounts receivable, net	—		—		1,020,454		—			1,020,454
Inventories, net	—		337,316		325,448		—			662,764
Other current assets	—		38,423		76,647		—			115,070
Total current assets	3		451,412		1,454,510		—			1,905,925
Intercompany receivables, net	—		—		1,751,125		(1,751,125		)	—
Property, buildings and equipment, net	—		59,543		81,455		—			140,998
Intangible assets, net	—		6,360		198,212		—			204,572
Goodwill and other intangibles, net	—		246,125		880,876		—			1,127,001
Investments in affiliates and other noncurrent assets	2,426,032		3,601,264		30,989		(6,016,787		)	41,498
Total assets	$	2,426,035	$	4,364,704	$	4,397,167	$	(7,767,912	)	$	3,419,994
Accounts payable	$	—	$	444,291	$	248,886	$	—		$	693,177
Other current liabilities	2,578		57,161		157,120		—			216,859
Total current liabilities	2,578		501,452		406,006		—			910,036
Intercompany payables, net	679,405		1,071,720		—		(1,751,125		)	—
Long-term debt	171,244		187,988		337,526		—			696,758
Other noncurrent liabilities	28,126		182,443		58,101		—			268,670
Stockholders’ equity	1,544,682		2,421,101		3,595,534		(6,016,787		)	1,544,530
Total liabilities and stockholders’ equity	$	2,426,035	$	4,364,704	$	4,397,167	$	(7,767,912	)	$	3,419,994

	December 31, 2011
	(In thousands)
	WESCO International, Inc.		WESCO Distribution, Inc.		Non-Guarantor Subsidiaries		Consolidating and Eliminating Entries			Consolidated
Cash and cash equivalents	$	5	$	44,412	$	19,452	$	—		$	63,869
Trade accounts receivable, net	—		—		939,422		—			939,422
Inventories, net	—		341,423		285,544		—			626,967
Other current assets	270		32,548		74,344		—			107,162
Total current assets	275		418,383		1,318,762		—			1,737,420
Intercompany receivables, net	—		—		1,771,921		(1,771,921		)	—
Property, buildings and equipment, net	—		54,038		79,512		—			133,550
Intangible assets, net	—		6,981		149,893		—			156,874
Goodwill and other intangibles, net	—		246,125		762,002		—			1,008,127
Investments in affiliates and other noncurrent assets	2,219,323		3,422,885		31,745		(5,631,472		)	42,481
Total assets	$	2,219,598	$	4,148,412	$	4,113,835	$	(7,403,393	)	$	3,078,452
Accounts payable	$	—	$	423,509	$	219,268	$	—		$	642,777
Other current liabilities	7,797		56,035		139,237		—			203,069
Total current liabilities	7,797		479,544		358,505		—			845,846
Intercompany payables, net	668,447		1,103,474		—		(1,771,921		)	—
Long-term debt	169,054		188,081		285,787		—			642,922
Other noncurrent liabilities	28,131		163,177		52,466		—			243,774
Stockholders’ equity	1,346,169		2,214,136		3,417,077		(5,631,472		)	1,345,910
Total liabilities and stockholders’ equity	$	2,219,598	$	4,148,412	$	4,113,835	$	(7,403,393	)	$	3,078,452

12

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF INCOME AND COMPREHENSIVE INCOME

(unaudited)

	Three Months Ended September 30, 2012
	(In thousands)
	WESCO International, Inc.		WESCO Distribution, Inc.		Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net sales	$	—	$	868,289	$	816,211		$	(28,314	)	$	1,656,186
Cost of goods sold	—		689,522		656,224			(28,314		)	1,317,432
Selling, general and administrative expenses	25		121,006		104,781			—			225,812
Depreciation and amortization	—		3,980		5,930			—			9,910
Results of affiliates’ operations	69,571		44,115		—			(113,686		)	—
Interest expense, net	6,095		3,706		2,853			—			12,654
Provision for income taxes	—		24,679		2,308			—			26,987
Net income (loss)	63,451		69,511		44,115			(113,686		)	63,391
Less: Net loss attributable to noncontrolling interest	—		—		(24		)	—			(24		)
Net income (loss) attributable to WESCO International, Inc.	$	63,451	$	69,511	$	44,139		$	(113,686	)	$	63,415
Comprehensive income:
Foreign currency translation adjustment	10,652		10,652		10,652			(21,304		)	10,652
Comprehensive income attributable to WESCO International, Inc.	$	74,103	$	80,163	$	54,791		$	(134,990	)	$	74,067

	Three Months Ended September 30, 2011
	(In thousands)
	WESCO International, Inc.			WESCO Distribution, Inc.			Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net sales	$	—		$	847,745		$	764,880		$	(32,249	)	$	1,580,376
Cost of goods sold	—			680,897			616,097			(32,249		)	1,264,745
Selling, general and administrative expenses	18			134,671			81,516			—			216,205
Depreciation and amortization	—			2,780			4,894			—			7,674
Results of affiliates’ operations	60,336			53,846			—			(114,182		)	—
Interest expense, net	6,428			5,573			3,078			—			15,079
Provision for income taxes	—			17,334			5,449			—			22,783
Net income (loss) attributable to WESCO International, Inc.	$	53,890		$	60,336		$	53,846		$	(114,182	)	$	53,890
Comprehensive income:
Foreign currency translation adjustment	(26,411		)	(26,411		)	(26,411		)	52,822			(26,411		)
Comprehensive income attributable to WESCO International, Inc.	$	27,479		$	33,925		$	27,435		$	(61,360	)	$	27,479

13

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF INCOME AND COMPREHENSIVE INCOME

(unaudited)

	Nine Months Ended September 30, 2012
	(In thousands)
	WESCO International, Inc.		WESCO Distribution, Inc.		Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net sales	$	—	$	2,602,688	$	2,432,239		$	(99,989	)	$	4,934,938
Cost of goods sold	—		2,074,165		1,966,586			(99,989		)	3,940,762
Selling, general and administrative expenses	49		413,540		271,541			—			685,130
Depreciation and amortization	—		11,231		15,200			—			26,431
Results of affiliates’ operations	192,729		164,338		—			(357,067		)	—
Interest expense, net	17,417		7,667		8,009			—			33,093
Provision for income taxes	—		67,694		6,565			—			74,259
Net income (loss)	175,263		192,729		164,338			(357,067		)	175,263
Less: Net loss attributable to noncontrolling interest	—		—		(4		)	—			(4		)
Net income (loss) attributable to WESCO International, Inc.	$	175,263	$	192,729	$	164,342		$	(357,067	)	$	175,267
Comprehensive income:
Foreign currency translation adjustment	14,297		14,297		14,297			(28,594		)	14,297
Comprehensive income attributable to WESCO International, Inc.	$	189,560	$	207,026	$	178,639		$	(385,661	)	$	189,564

	Nine Months Ended September 30, 2011
	(In thousands)
	WESCO International, Inc.			WESCO Distribution, Inc.			Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net sales	$	—		$	2,386,968		$	2,223,588		$	(74,360	)	$	4,536,196
Cost of goods sold	—			1,913,902			1,788,124			(74,360		)	3,627,666
Selling, general and administrative expenses	62			404,112			240,002			—			644,176
Depreciation and amortization	—			8,228			14,633			—			22,861
Results of affiliates’ operations	159,957			156,191			—			(316,148		)	—
Interest expense, net	18,493			12,839			10,319			—			41,651
Provision for income taxes	—			44,121			14,319			—			58,440
Net income (loss) attributable to WESCO International, Inc.	$	141,402		$	159,957		$	156,191		$	(316,148	)	$	141,402
Comprehensive income:
Foreign currency translation adjustment	(16,685		)	(16,685		)	(16,685		)	33,370			(16,685		)
Comprehensive income attributable to WESCO International, Inc.	$	124,717		$	143,272		$	139,506		$	(282,778	)	$	124,717

14

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS

(unaudited)

	Nine Months Ended September 30, 2012
	(In thousands)
	WESCO International, Inc.			WESCO Distribution, Inc.			Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries		Consolidated
Net cash (used) provided by operating activities	$	(8,490	)	$	201,343		$	(3,170	)	$	—	$	189,683
Investing activities:
Capital expenditures	—			(15,654		)	(3,815		)	—		(19,469		)
Acquisition payments	—			(201,123		)	—			—		(201,123		)
Other	—			51			—			—		51
Net cash used in investing activities	—			(216,726		)	(3,815		)	—		(220,541		)
Financing activities:
Net borrowings	10,957			36,589			19,259			—		66,805
Equity transactions	(2,469		)	—			—			—		(2,469		)
Other	—			10,055			—			—		10,055
Net cash provided by financing activities	8,488			46,644			19,259			—		74,391
Effect of exchange rate changes on cash and cash equivalents	—			—			235			—		235
Net change in cash and cash equivalents	(2.4		)	31,261			12,509			—		43,768
Cash and cash equivalents at the beginning of year	5			44,412			19,452			—		63,869
Cash and cash equivalents at the end of period	$	3		$	75,673		$	31,961		$	—	$	107,637

	Nine Months Ended September 30, 2011
	(In thousands)
	WESCO International, Inc.			WESCO Distribution, Inc.			Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries		Consolidated
Net cash provided (used) by operating activities	$	(2,450	)	$	33,256		$	41,022		$	—	$	71,828
Investing activities:
Capital expenditures	—			(21,700		)	(2,266		)	—		(23,966		)
Acquisition payments	—			(8,166		)	—			—		(8,166		)
Other	—			86			—			—		86
Net cash used in investing activities	—			(29,780		)	(2,266		)	—		(32,046		)
Financing activities:
Net (repayments) borrowings	4,973			(6,002		)	—			—		(1,029		)
Equity transactions	(2,517		)	—			—			—		(2,517		)
Other	—			8,751			—			—		8,751
Net cash provided by financing activities	2,456			2,749			—			—		5,205
Effect of exchange rate changes on cash and cash equivalents	—			—			(4,515		)	—		(4,515		)
Net change in cash and cash equivalents	6			6,225			34,241			—		40,472
Cash and cash equivalents at the beginning of year	1			32,342			21,234			—		53,577
Cash and cash equivalents at the end of period	$	7		$	38,567		$	55,475		$	—	$	94,049

15

10. SUBSEQUENT EVENTS

On October 15, 2012, WESCO entered into a definitive agreement to acquire EECOL Electric Corporation, headquartered in Calgary, Alberta, Canada, and various affiliated companies for a purchase price of approximately CAD$1.14 billion. EECOL Electric is one of Canada's premier full-line distributors of electrical equipment, products and services with approximately $0.9 billion in annual sales, 57 locations across Canada and 20 in South America, and more than 20,000 customers. Consummation of the transaction is subject to certain conditions, including approval under the Canadian Competition Act. The acquisition is expected to be financed utilizing a new institutional term loan to be entered into on or before closing, as well as WESCO's existing credit facilities. Closing is expected to occur during the fourth quarter of 2012.

16

Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations

The following discussion should be read in conjunction with the information in the unaudited condensed consolidated financial statements and notes thereto included herein and WESCO International, Inc.’s Financial Statements and Management’s Discussion and Analysis of Financial Condition and Results of Operations included in its 2011 Annual Report on Form 10-K. The matters discussed herein may contain forward-looking statements that are subject to certain risks and uncertainties that could cause actual results to differ materially from expectations. Certain of these risks are set forth in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2011, as well as the Company’s other reports filed with the Securities and Exchange Commission.

Company Overview

WESCO International, Inc., incorporated in 1993 and effectively formed in February 1994 upon acquiring a distribution business from Westinghouse Electric Corporation, is a leading North American based distributor of products and provider of advanced supply chain management and logistics services used primarily in industrial, construction, utility and commercial, institutional and government markets. We serve over 65,000 active customers globally through approximately 400 full-service branches and eight distribution centers located in the United States, Canada, and Mexico, with offices in 11 additional countries. Approximately 80% of our net sales for the first nine months of 2012 were generated from operations in the United States, 16% from Canada and the remainder from other countries.

We sell electrical, industrial, and communications maintenance, repair and operating (“MRO”) and original equipment manufacturers (“OEM”) products, construction materials, and advanced supply chain management and logistics services. Our primary product categories include general electrical and industrial supplies, wire, cable and conduit, data and broadband communications, power distribution equipment, lighting and lighting control systems, control and automation, and motors. We distribute over 1,000,000 products from more than 18,000 suppliers utilizing a highly automated, proprietary electronic procurement and inventory replenishment system. In addition, we offer a comprehensive portfolio of value-added services, which includes supply chain management, logistics and transportation procurement, warehousing and inventory management, as well as kitting, limited assembly of products and system installation. Our value-added capabilities, extensive geographic reach, experienced workforce and broad product and supply chain solutions have enabled us to grow our business and establish a leading position in North America.

Our financial results for the first nine months of 2012 reflect the continued execution of our growth strategy and the positive impact from recent acquisitions. Net sales increased $398.7 million, or 8.8%, over the same period last year. Cost of goods sold as a percentage of net sales was 79.9% and 80.0% for the first nine months of 2012 and 2011, respectively. Operating income increased by $41.1 million, or 17.0%, primarily from organic growth of the base business and from recent acquisitions. Net income attributable to WESCO International, Inc. for the nine months ended September 30, 2012 and 2011 was $175.3 million and $141.4 million, respectively.

Cash Flow

We generated $189.7 million in operating cash flow for the first nine months of 2012. Included in this amount was increased income as a result of improved operating results offset by investments in working capital to fund our growth. Investing activities included payments of $201.1 million for the acquisitions of RS Electronics, Conney Safety Products, and Trydor Industries along with $19.5 million for capital expenditures. Financing activities consisted of borrowings and repayments of $413.2 million and $414.8 million, respectively, related to our revolving credit facility (the "Revolving Credit Facility"), and borrowings and repayments of $327.2 million and $275.0 million, respectively, related to our accounts receivable securitization facility (the “Receivables Facility”).

Financing Availability

As of September 30, 2012, we had $476.4 million in total available borrowing capacity. The available borrowing capacity under our Revolving Credit Facility, which has a maturity date in August 2016, was $328.6 million, of which $200.3 million was available for U.S. borrowings and $128.3 million was available for Canadian borrowings. The available borrowing capacity under the Receivables Facility, which has a maturity date in August 2014, was $147.8 million. We monitor the depository institutions that hold our cash and cash equivalents on a regular basis, and we believe that we have placed our deposits with creditworthy financial institutions. For further discussion refer to “Liquidity and Capital Resources.”

17

Critical Accounting Policies and Estimates

During the nine months ended September 30, 2012, there were no significant changes to our critical accounting policies and estimates referenced in our 2011 Annual Report on Form 10-K.

Results of Operations

Third Quarter of 2012 versus Third Quarter of 2011

The following table sets forth the percentage relationship to net sales of certain items in our condensed consolidated statements of income for the periods presented:

	Three Months Ended
	September 30,
	2012		2011
Net sales	100.0	%	100.0	%
Cost of goods sold	79.5		80.0
Selling, general and administrative expenses	13.6		13.7
Depreciation and amortization	0.7		0.5
Income from operations	6.2		5.8
Interest expense	0.8		0.9
Income before income taxes	5.4		4.9
Provision for income taxes	1.6		1.5
Net income attributable to WESCO International, Inc.	3.8	%	3.4	%

Net sales in the third quarter of 2012 totaled $1,656.2 million versus $1,580.4 million in the comparable period for 2011, an increase of $75.8 million, or 4.8%, over the same period last year. Sales were positively impacted by recent acquisitions and the execution of growth initiatives. The increase in net sales included a positive impact from acquisitions of 4.0%, a negative impact of 1.6% due to one less workday in the quarter, and a negative impact from foreign exchange of 0.6%. Additionally, management estimates the positive impact on net sales due to pricing was approximately 0.5%.

Cost of goods sold for the third quarter of 2012 was $1,317.4 million versus $1,264.7 million for the comparable period in 2011, and cost of goods sold as a percentage of net sales was 79.5% and 80.0% in 2012 and 2011, respectively. The decrease in the cost of goods sold percentage was primarily due to higher supplier volume rebate rates driven by the increase in sales and the positive margin impact from recent acquisitions.

Selling, general and administrative ("SG&A") expenses in the third quarter of 2012 totaled $225.8 million versus $216.2 million in last year's comparable quarter. The increase in SG&A is primarily due to the recent acquisitions and payroll expenses related to the growth in headcount. As a percentage of net sales, SG&A expenses were 13.6% in the third quarter of 2012 compared to 13.7% in the third quarter of 2011. SG&A expenses expanded at a lower rate than sales due to the fixed cost nature of certain SG&A expense components and the effective execution of cost containment initiatives.

SG&A payroll expenses for the third quarter of 2012 of $161.6 million increased by $10.8 million compared to the same quarter in 2011. The increase in payroll expenses was primarily due to an increase in salaries and wages of $10.2 million and an increase in benefit and incentive costs of $1.1 million, both related to the recent acquisitions and growth in headcount. Other SG&A payroll related expenses decreased $0.6 million.

The remaining SG&A expenses for the third quarter of 2012 of $64.2 million decreased by $1.2 million compared to the same quarter in 2011 due to the effective execution of cost containment initiatives.

Depreciation and amortization for the third quarter of 2012 was $9.9 million versus $7.7 million in last year's comparable quarter. The increase in depreciation and amortization is due to an increase in capital expenditures in 2011.

Interest expense totaled $12.7 million for the third quarter of 2012 versus $15.1 million in last year's comparable quarter, a decrease of 16.1%. The decrease in interest expense was primarily due to a decrease in non-cash interest expense of $2.2 million. Interest expense for the three months ended September 30, 2011 included the write-off of $1.8 million of deferred financing fees as the result of a new Revolving Credit Facility in the third quarter of 2011.

18

Income tax expense totaled $27.0 million in the third quarter of 2012 compared to $22.8 million in last year's comparable quarter, and the effective tax rate was 29.9% compared to 29.7% in the same quarter in 2011. The increase in the effective tax rate is primarily due to increased income related to our domestic operations as well as the impact of discrete items.

For the third quarter of 2012, net income increased by $9.5 million to $63.4 million compared to $53.9 million in the third quarter of 2011.

Net loss attributable to the noncontrolling interest was less than $0.1 million for the third quarter of 2012.

Net income and diluted earnings per share attributable to WESCO International, Inc. was $63.4 million and $1.25 per share, respectively, for the third quarter of 2012, compared with $53.9 million and $1.11 per share, respectively, for the third quarter of 2011.

Nine Months Ended September 30, 2012 versus Nine Months Ended September 30, 2011

The following table sets forth the percentage relationship to net sales of certain items in our condensed consolidated statements of income for the periods presented:

	Nine Months Ended
	September 30,
	2012		2011
Net sales	100.0	%	100.0	%
Cost of goods sold	79.9		80.0
Selling, general and administrative expenses	13.9		14.2
Depreciation and amortization	0.5		0.5
Income from operations	5.7		5.3
Interest expense	0.7		0.9
Income before income taxes	5.0		4.4
Provision for income taxes	1.5		1.3
Net income attributable to WESCO International, Inc.	3.5	%	3.1	%

Net sales in the first nine months of 2012 totaled $4,934.9 million versus $4,536.2 million in the comparable period for 2011, an increase of $398.7 million, or 8.8%, over the same period last year. Sales were positively impacted by our growth initiatives and recent acquisitions. The increase in net sales included a positive impact from acquisitions of 2.9% and a negative impact of 0.5% from foreign exchange rates. Additionally, management estimates the positive impact on net sales due to pricing was approximately 1.0%.

Cost of goods sold for the first nine months of 2012 was $3,940.8 million versus $3,627.7 million for the comparable period in 2011, and cost of goods sold as a percentage of net sales was 79.9% in 2012 and 80.0% in 2011.

SG&A expenses in the first nine months of 2012 totaled $685.1 million versus $644.2 million in last year's comparable period. The increase in SG&A expenses was primarily due to payroll expenses related to the recent acquisitions and growth in headcount. As a percentage of net sales, SG&A expenses were 13.9% in the first nine months of 2012 compared to 14.2% in the first nine months of 2011. SG&A expenses increased at a lower rate than sales due to the fixed cost nature of certain SG&A expense components and the effective execution of cost containment initiatives.

SG&A payroll expenses for the first nine months of 2012 of $491.7 million increased by $39.9 million compared to the same period in 2011. The increase in payroll expenses was primarily due to an increase in salaries and wages of $29.0 million and benefit costs of $9.4 million, both due to the recent acquisitions and an increase in headcount. The increase in commissions and incentives of $4.7 million is related to the growth in sales and income along with the recent acquisitions. Other SG&A payroll related expenses decreased $3.2 million.

The remaining SG&A expenses for the first nine months of 2012 of $193.4 million increased by approximately $1.0 million compared to the same period in 2011 due to an increase in variable operating expenses associated with the growth in sales. Expenses expanded at a lower rate than sales due to the effective execution of cost containment initiatives.

19

Depreciation and amortization for the first nine months of 2012 was $26.4 million versus $22.9 million in last year's comparable period. The increase in depreciation and amortization is primarily due to the increase in capital expenditures in 2011.

Interest expense totaled $33.1 million for the first nine months of 2012 versus $41.7 million in last year's comparable period, a decrease of 20.5%. Non-cash interest expense, which includes convertible debt interest, interest related to uncertain tax positions, and the amortization of deferred financing fees, for the first nine months of 2012 and 2011 was $0.8 million and $7.2 million, respectively. Non-cash interest for the nine months ended September 30, 2012 included a favorable adjustment of $3.3 million of previously recorded interest related to uncertain tax positions. This adjustment was the result of a favorable Internal Revenue Service appeals settlement in the first quarter of 2012 related to years 2000 to 2006. Interest expense for the nine months ended September 30, 2011 included the write-off of $1.8 million of deferred financing fees as the result of a new Revolving Credit Facility in the third quarter of 2011. The decrease in cash interest expense for the first nine months of 2012 was the result of a decrease in interest rates due to entering into a new Revolving Credit Facility and amending the Receivables Facility in August 2011.

Income tax expense totaled $74.3 million in the first nine months of 2012 compared to $58.4 million in the first nine months of 2011, and the effective tax rate was 29.8% compared to 29.2% in the same period in 2011. The increase in the effective tax rate is primarily due to increased income related to our domestic operations as well as the impact of discrete items.

For the first nine months of 2012, net income increased by $33.9 million to $175.3 million compared to $141.4 million in the first nine months of 2011.

Net loss attributable to the noncontrolling interest was less than $0.1 million for the first nine months of 2012.

Net income and diluted earnings per share attributable to WESCO International, Inc. was $175.3 million and $3.43 per share, respectively, for the first nine months of 2012, compared with $141.4 million and $2.84 per share, respectively, for the first nine months of 2011.

Liquidity and Capital Resources

Total assets were $3.4 billion at September 30, 2012, compared to $3.1 billion at December 31, 2011. The $341.5 million increase in total assets was primarily attributable to an increase in other assets of $173.1 million due to an increase in goodwill of $118.9 million and an increase in intangible assets of $47.7 million. The increase in total assets was also due to an increase in accounts receivable of $81.0 million and an increase in inventory of $35.8 million. Total liabilities at September 30, 2012 and December 31, 2011 were $1.9 billion and $1.7 billion, respectively. The $142.9 million increase in total liabilities was primarily a result of the increase in current and long-term debt of $72.5 million due to 2012 acquisitions and the increase in accounts payable of $50.4 million. Stockholders’ equity increased by 14.8% to $1,544.5 million at September 30, 2012, compared with $1,345.9 million at December 31, 2011, primarily as a result of net earnings of $175.3 million, stock-based compensation expense of $11.7 million, and foreign currency translation adjustments of $14.3 million.

Our liquidity needs generally arise from fluctuations in our working capital requirements, capital expenditures, acquisitions and debt service obligations. As of September 30, 2012, we had $328.6 million in available borrowing capacity under our Revolving Credit Facility, which combined with our $147.8 million of available borrowing capacity under our Receivables Facility and our invested cash of $12.7 million provided liquidity of $489.1 million. Invested cash included in our determination of liquidity represents cash deposited in interest bearing accounts. Our intent is to repay our mortgage financing facility, which becomes due in early 2013, with borrowings under either the Revolving Credit Facility or the Receivables Facility. We believe cash provided by operations and financing activities will be adequate to cover our current operational and business needs.

We communicate on a regular basis with our lenders regarding our financial and working capital performance and liquidity position. We are in compliance with all covenants and restrictions contained in our debt agreements as of September 30, 2012.

At September 30, 2012, we had cash and cash equivalents totaling $107.6 million, of which $39.1 million was held by foreign subsidiaries. The cash held by some of our foreign subsidiaries could be subject to additional U.S. income taxes if repatriated. We believe that we are able to maintain a sufficient level of liquidity for our domestic operations and commitments without repatriation of the cash held by these foreign subsidiaries.

We did not note any conditions or events during the third quarter of 2012 requiring an interim evaluation of impairment of goodwill. We will perform our annual impairment testing of goodwill and indefinite-lived intangible assets during the fourth quarter of 2012.

20

Over the next several quarters, we expect to maintain working capital productivity, and it is expected that excess cash will be directed primarily at debt reduction and acquisitions. Our near term focus will be managing our working capital as we experience sales growth and maintaining ample liquidity and credit availability. We believe our balance sheet and ability to generate ample cash flow provides us with a durable business model and should allow us to fund expansion needs and growth initiatives.

Cash Flow

Operating Activities. Cash provided by operating activities for the first nine months of 2012 totaled $189.7 million, compared with $71.8 million of cash generated for the first nine months of 2011. Cash provided by operating activities included net income of $175.3 million and adjustments to net income totaling $70.1 million. Other sources of cash in 2012 were generated from an increase in accounts payable of $38.5 million due to the increase in purchasing activity, a decrease in prepaid expenses and other current assets of $9.1 million, and an increase in other current and noncurrent liabilities of $6.4 million. Primary uses of cash in 2012 included: $64.0 million for the increase in trade and other receivables, resulting from the increase in sales; $15.4 million for the decrease in accrued payroll and benefit costs resulting from the payment of the 2011 management incentive compensation and 401(k) discretionary contribution; and $16.0 million for the increase in inventory. In the first nine months of 2011, primary sources of cash were net income of $141.4 million and adjustments to net income totaling $46.8 million. Other sources of cash included an increase in accounts payable of $110.6 million resulting from the increase in purchasing activity. Primary uses of cash in the first nine months of 2011 included: $154.7 million for the increase in trade and other receivables resulting from the increase in sales; $44.2 million for the increase in inventory; $24.4 million for the decrease in other current and noncurrent liabilities; and $2.7 million for the decrease in accrued payroll and benefit costs resulting from the payment of the 2010 management incentive compensation and 401(k) discretionary contribution; and a decrease in prepaid expenses and other current assets of $1.0 million.

Investing Activities. Net cash used by investing activities for the first nine months of 2012 was $220.5 million, compared with $32.0 million of net cash used during the first nine months of 2011. Included in 2012 were payments of $201.1 million related to the acquisition of RS Electronics, Conney Safety, and Trydor. Included in 2011 were payments of $8.2 million related to the acquisition of the business of RECO. Capital expenditures were $19.5 million and $24.0 million in the first nine months of 2012 and 2011, respectively.

Financing Activities. Net cash used by financing activities for the first nine months of 2012 and 2011 was $74.4 million and $5.2 million, respectively. During the first nine months of 2012, borrowings and repayments of long-term debt of $413.2 million and $414.8 million, respectively, were made to our Revolving Credit Facility. Borrowings and repayments of $327.2 million and $275.0 million respectively, were applied to our Receivables Facility, and there were repayments of $1.3 million to our mortgage financing facility. Financing activities in 2012 also included borrowings on our various international lines of credit of approximately $21.4 million. During the first nine months of 2011, borrowings and repayments of long-term debt of $323.5 million were made to our Revolving Credit Facility. Borrowings and repayments of $140.0 million were applied to our Receivables Facility, and there were repayments of $1.3 million to our mortgage financing facility.

Contractual Cash Obligations and Other Commercial Commitments

There were no material changes in our contractual obligations and other commercial commitments that would require an update to the disclosure provided in our 2011 Annual Report on Form 10-K, other than the borrowings for acquisitions discussed in Note 3 of our Notes to these Condensed Consolidated Financial Statements. Management believes that cash generated from operations, together with amounts available under our Revolving Credit Facility and the Receivables Facility, will be sufficient to meet our working capital, capital expenditures and other cash requirements for the foreseeable future. However, there can be no assurances that this will continue to be the case.

Inflation

The rate of inflation affects different commodities, the cost of products purchased, and ultimately the pricing of our different products and product classes to our customers. Our pricing related to inflation was approximately 1.0% of our sales revenue for the first nine months of 2012. Historically, price changes from suppliers have been consistent with inflation and have not had a material impact on the results of operations.

Seasonality

Our operating results are not significantly affected by seasonal factors. Sales during the first and fourth quarters are generally 1 to 3% below the sales of the second and third quarters, due to a reduced level of activity during the winter months of November through February. Sales typically increase beginning in March, with slight fluctuations per month through October. During periods of economic expansion or contraction, our sales by quarter have varied significantly from this pattern.

21

Impact of Recently Issued Accounting Standards

See Note 2 of our Notes to the Condensed Consolidated Financial Statements for information regarding the effect of new accounting pronouncements.

Forward-Looking Statements

From time to time in this report and in other written reports and oral statements, references are made to expectations regarding our future performance. When used in this context, the words “anticipates,” “plans,” “believes,” “estimates,” “intends,” “expects,” “projects,” “will” and similar expressions may identify forward-looking statements, although not all forward-looking statements contain such words. Such statements including, but not limited to, our statements regarding business strategy, growth strategy, competitive strengths, productivity and profitability enhancement, competition, new product and service introductions and liquidity and capital resources are based on management’s beliefs, as well as on assumptions made by and information currently available to, management, and involve various risks and uncertainties, some of which are beyond our control. Our actual results could differ materially from those expressed in any forward-looking statement made by us or on our behalf. In light of these risks and uncertainties, there can be no assurance that the forward-looking information will in fact prove to be accurate. Certain of these risks are set forth in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2011, as well as the Company’s other reports filed with the Securities and Exchange Commission. We have undertaken no obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

22

Item 3.Quantitative and Qualitative Disclosures about Market Risks

There have not been any material changes to our exposures to market risk during the quarter ended September 30, 2012 that would require an update to the disclosures provided in our 2011 Annual Report on Form 10-K.

Item 4.Controls and Procedures

Conclusion Regarding the Effectiveness of Disclosure Controls and Procedures

Under the supervision and with the participation of our management, including our principal executive officer and principal financial officer, we conducted an evaluation of our disclosure controls and procedures as such term is defined under Rule 13a-15(e) promulgated under the Exchange Act. Based on this evaluation, our principal executive officer and our principal financial officer concluded that our disclosure controls and procedures were effective as of the end of the period covered by this report.

Changes in Internal Control Over Financial Reporting

During the third quarter of 2012, there were no changes in our internal control over financial reporting identified in connection with management's evaluation of the effectiveness of our internal control over financial reporting that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting. In making its assessment of changes in internal control over financial reporting as of September 30, 2012, management has excluded Conney Safety and Trydor, two companies acquired in business combinations during the third quarter of 2012. The Company is currently assessing the control environments of these acquisitions. The total revenue of these companies for the three month period ended September 30, 2012 represents approximately 1.8% of the Company's consolidated revenue for the same period.

23

Part II - Other Information

Item 1. Legal Proceedings

From time to time, a number of lawsuits and claims have been or may be asserted against us relating to the conduct of our business, including routine litigation relating to commercial and employment matters. The outcome of any litigation cannot be predicted with certainty, and some lawsuits may be determined adversely to us. However, management does not believe, based on information presently available, that the ultimate outcome of any such pending matters is likely to have a material adverse effect on our financial condition or liquidity, although the resolution in any quarter of one or more of these matters may have a material adverse effect on our results of operations for that period.

As initially reported in our 2008 Annual Report on Form 10-K, we are a co-defendant in a lawsuit filed in a state court in Indiana in which a customer alleges that we sold defective products manufactured or remanufactured by others and is seeking monetary damages in the amount of approximately $50 million. We have denied any liability, continue to believe that we have meritorious defenses and intend to vigorously defend ourselves against these allegations. Accordingly, no liability was recorded for this matter as of September 30, 2012. Furthermore, due to the uncertainty of this litigation, we are not currently able to reasonably estimate the possible loss or range of loss from this legal proceeding.

Item 6.Exhibits

(a) Exhibits

31.1 Certification of Chief Executive Officer pursuant to Rules 13a-14(a) promulgated under the Exchange Act.

31.2 Certification of Chief Financial Officer pursuant to Rules 13a-14(a) promulgated under the Exchange Act.

32.1 Certification of Chief Executive Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

32.2 Certification of Chief Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

101 Interactive Data File*

* In accordance with Rule 406T of Regulation S-T promulgated by the Securities and Exchange Commission, Exhibit 101 is deemed not filed or part of a registration statement or prospectus for purposes of Sections 11 or 12 of the Securities Act of 1933, is deemed not filed for purposes of Section 18 of the Securities Exchange Act of 1934, and otherwise is not subject to liability under these sections.

24

Signatures

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

WESCO International, Inc.

Date: October 31, 2012	By:	/s/ Kenneth S. Parks
		Kenneth S. Parks
		Vice President and Chief Financial Officer

25

EX-31.1

Exhibit 31.1

CERTIFICATION

     I, John J. Engel, certify that:

     1.      I have reviewed this quarterly report on Form 10-Q of WESCO International, Inc.;

     2.     Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

     3.     Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

     4.      The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

    (a)      Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

    (b)      Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

    (c)      Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

    (d)      Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

     5.      The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

    (a)      All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date:	October 31, 2012	By:	/s/ John J. Engel
			John J. Engel
			Chairman, President and Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION

     I, Kenneth S. Parks, certify that:

     1.      I have reviewed this quarterly report on Form 10-Q of WESCO International, Inc.;

     2.     Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

     3.     Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

     4.      The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

    (a)      Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

    (b)      Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

    (c)      Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

    (d)      Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

     5.      The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

    (a)      All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

    (b)      Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date:	October 31, 2012	By:	/s/ Kenneth S. Parks
			Kenneth S. Parks
			Vice President and Chief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of WESCO International, Inc. (the “Company”) on Form 10-Q for the period ended September 30, 2012 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), the undersigned, in the capacity and on the date indicated below, hereby certifies pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to his knowledge:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operation of the Company.

Date: October 31, 2012	By:	/s/ John J. Engel
		John J. Engel
		Chairman, President and Chief Executive Officer

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of WESCO International, Inc. (the “Company”) on Form 10-Q for the period ended September 30, 2012 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), the undersigned, in the capacity and on the date indicated below, hereby certifies pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to his knowledge:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operation of the Company.

Date: October 31, 2012	By:	/s/ Kenneth S. Parks
		Kenneth S. Parks
		Vice President and Chief Financial Officer

XML

CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS (Details) (USD $)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Condensed Financial Information [Line Items]
Net cash (used) provided by operating activities	$ 189,683,000	$ 71,828,000
Investing Activities:
Capital expenditures	(19,469,000)	(23,966,000)
Acquisition payments	(201,123,000)	(8,166,000)
Other	51,000	86,000
Net cash used in investing activities	(220,541,000)	(32,046,000)
Financing Activities:
Net borrowings (repayments)	66,805,000	(1,029,000)
Equity transactions	(2,469,000)	(2,517,000)
Other	10,055,000	8,751,000
Net cash (used in) provided by financing activities	74,391,000	5,205,000
Effect of exchange rate changes on cash and cash equivalents	235,000	(4,515,000)
Net change in cash and cash equivalents	43,768,000	40,472,000
Cash and cash equivalents at the beginning of the period	63,869,000	53,577,000
Cash and cash equivalents at the end of the period	107,637,000
Parent Company [Member]
Condensed Financial Information [Line Items]
Net cash (used) provided by operating activities	(8,490,000)	(2,450,000)
Investing Activities:
Capital expenditures	0	0
Acquisition payments	0	0
Other	0	0
Net cash used in investing activities	0	0
Financing Activities:
Net borrowings (repayments)	10,957,000	4,973,000
Equity transactions	(2,469,000)	(2,517,000)
Other	0	0
Net cash (used in) provided by financing activities	8,488,000	2,456,000
Effect of exchange rate changes on cash and cash equivalents	0	0
Net change in cash and cash equivalents	(2,400)	6,000
Cash and cash equivalents at the beginning of the period	5,000	1,000
Cash and cash equivalents at the end of the period	3,000
Guarantor Subsidiaries [Member]
Condensed Financial Information [Line Items]
Net cash (used) provided by operating activities	201,343,000	33,256,000
Investing Activities:
Capital expenditures	(15,654,000)	(21,700,000)
Acquisition payments	(201,123,000)	(8,166,000)
Other	51,000	86,000
Net cash used in investing activities	(216,726,000)	(29,780,000)
Financing Activities:
Net borrowings (repayments)	36,589,000	(6,002,000)
Equity transactions	0	0
Other	10,055,000	8,751,000
Net cash (used in) provided by financing activities	46,644,000	2,749,000
Effect of exchange rate changes on cash and cash equivalents	0	0
Net change in cash and cash equivalents	31,261,000	6,225,000
Cash and cash equivalents at the beginning of the period	44,412,000	32,342,000
Cash and cash equivalents at the end of the period	75,673,000
Non-Guarantor Subsidiaries [Member]
Condensed Financial Information [Line Items]
Net cash (used) provided by operating activities	(3,170,000)	41,022,000
Investing Activities:
Capital expenditures	(3,815,000)	(2,266,000)
Acquisition payments	0	0
Other	0	0
Net cash used in investing activities	(3,815,000)	(2,266,000)
Financing Activities:
Net borrowings (repayments)	19,259,000	0
Equity transactions	0	0
Other	0	0
Net cash (used in) provided by financing activities	19,259,000	0
Effect of exchange rate changes on cash and cash equivalents	235,000	(4,515,000)
Net change in cash and cash equivalents	12,509,000	34,241,000
Cash and cash equivalents at the beginning of the period	19,452,000	21,234,000
Cash and cash equivalents at the end of the period	31,961,000
Consolidation, Eliminations [Member]
Condensed Financial Information [Line Items]
Net cash (used) provided by operating activities	0	0
Investing Activities:
Capital expenditures	0	0
Acquisition payments	0	0
Other	0	0
Net cash used in investing activities	0	0
Financing Activities:
Net borrowings (repayments)	0	0
Equity transactions	0	0
Other	0	0
Net cash (used in) provided by financing activities	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0
Net change in cash and cash equivalents	0	0
Cash and cash equivalents at the beginning of the period	0	0
Cash and cash equivalents at the end of the period	$ 0

XML

EMPLOYEE BENEFIT PLANS (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Schedule of Employee Benefit Plans [Line Items]
Defined Contribution Plan, Cost Recognized	$ 24.2	$ 19.5
UNITED STATES
Schedule of Employee Benefit Plans [Line Items]
Defined Contribution Plan Employer Matching Contribution Percent	50.00%
Defined Contribution Plan Maximum Annual Contribution Per Employee Percent	6.00%
Minimum [Member] | CANADA
Schedule of Employee Benefit Plans [Line Items]
Defined Contribution Plan Maximum Annual Contribution Per Employee Percent	1.00%
Maximum [Member] | CANADA
Schedule of Employee Benefit Plans [Line Items]
Defined Contribution Plan Maximum Annual Contribution Per Employee Percent	7.00%

XML

SCHEDULE OF SHARE-BASED COMPENSATION, STOCK OPTIONS AND STOCK APPRECIATION RIGHTS AWARD ACTIVITY (Details) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2012 Y
Share-based Compensation Arrangement By Share-based Payment Award, Options and Stock Appreciation Rights, Outstanding [Roll Forward]
Beginning of Year (in shares)	4,266,533
Grants in Period (in shares)	257,932
Exercises in Period (in shares)	697,037
Forfeitures in Period (in shares)	36,061
End of Period (in shares)	3,791,367
Exercisable (in shares)	3,084,703
Weighted Average Exercise Price, Beginning of Year (in dollars per share)	$ 39.64
Weighted Average Exercise Price, Grants in Period (in dollars per share)	$ 64.12
Weighted Average Exercise Price, Exercises in Period (in dollars per share)	$ 32.46
Weighted Average Exercise Price, Forfeitures in Period (in dollars per share)	$ 49.43
Weighted Average Exercise Price, End of Period (in dollars per share)	$ 42.54
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 40.06
Weighted Average Remaining Contractual Term, Outstanding (in years)	5.8
Weighted Average Remaining Contractual Term, Exercisable (in years)	5.1
Aggregate Intrinsic Value, Outstanding	$ 72,535
Aggregate Intrinsic Value, Exercisable	$ 66,470

XML

CONDENSED CONSOLIDATED BALANCE SHEETS (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Jun. 30, 2011	Dec. 31, 2010
Condensed Financial Information [Line Items]
Cash and cash equivalents	$ 107,637	$ 63,869	$ 94,049	$ 53,577
Trade accounts receivable, net	1,020,454	939,422
Inventories, net	662,764	626,967
Other current assets	115,070	107,162
Total current assets	1,905,925	1,737,420
Intercompany receivables, net	0	0
Property, buildings and equipment, net	140,998	133,550
Intangible assets, net	204,572	156,874
Goodwill and other intangibles, net	1,127,001	1,008,127
Investments in affiliates and other noncurrent assets	41,498	42,481
Total assets	3,419,994	3,078,452
Accounts payable	693,177	642,777
Other current liabilities	216,859	203,069
Total current liabilities	910,036	845,846
Intercompany payables, net	0	0
Long-term debt	696,758	642,922
Other noncurrent liabilities	268,670	243,774
Total stockholders' equity	1,544,530	1,345,910
Total liabilities and stockholders' equity	3,419,994	3,078,452
Parent Company [Member]
Condensed Financial Information [Line Items]
Cash and cash equivalents	3	5	7	1
Trade accounts receivable, net	0	0
Inventories, net	0	0
Other current assets	0	270
Total current assets	3	275
Intercompany receivables, net	0	0
Property, buildings and equipment, net	0	0
Intangible assets, net	0	0
Goodwill and other intangibles, net	0	0
Investments in affiliates and other noncurrent assets	2,426,032	2,219,323
Total assets	2,426,035	2,219,598
Accounts payable	0	0
Other current liabilities	2,578	7,797
Total current liabilities	2,578	7,797
Intercompany payables, net	679,405	668,447
Long-term debt	171,244	169,054
Other noncurrent liabilities	28,126	28,131
Total stockholders' equity	1,544,682	1,346,169
Total liabilities and stockholders' equity	2,426,035	2,219,598
Guarantor Subsidiaries [Member]
Condensed Financial Information [Line Items]
Cash and cash equivalents	75,673	44,412	38,567	32,342
Trade accounts receivable, net	0	0
Inventories, net	337,316	341,423
Other current assets	38,423	32,548
Total current assets	451,412	418,383
Intercompany receivables, net	0	0
Property, buildings and equipment, net	59,543	54,038
Intangible assets, net	6,360	6,981
Goodwill and other intangibles, net	246,125	246,125
Investments in affiliates and other noncurrent assets	3,601,264	3,422,885
Total assets	4,364,704	4,148,412
Accounts payable	444,291	423,509
Other current liabilities	57,161	56,035
Total current liabilities	501,452	479,544
Intercompany payables, net	1,071,720	1,103,474
Long-term debt	187,988	188,081
Other noncurrent liabilities	182,443	163,177
Total stockholders' equity	2,421,101	2,214,136
Total liabilities and stockholders' equity	4,364,704	4,148,412
Non-Guarantor Subsidiaries [Member]
Condensed Financial Information [Line Items]
Cash and cash equivalents	31,961	19,452	55,475	21,234
Trade accounts receivable, net	1,020,454	939,422
Inventories, net	325,448	285,544
Other current assets	76,647	74,344
Total current assets	1,454,510	1,318,762
Intercompany receivables, net	1,751,125	1,771,921
Property, buildings and equipment, net	81,455	79,512
Intangible assets, net	198,212	149,893
Goodwill and other intangibles, net	880,876	762,002
Investments in affiliates and other noncurrent assets	30,989	31,745
Total assets	4,397,167	4,113,835
Accounts payable	248,886	219,268
Other current liabilities	157,120	139,237
Total current liabilities	406,006	358,505
Intercompany payables, net	0	0
Long-term debt	337,526	285,787
Other noncurrent liabilities	58,101	52,466
Total stockholders' equity	3,595,534	3,417,077
Total liabilities and stockholders' equity	4,397,167	4,113,835
Consolidation, Eliminations [Member]
Condensed Financial Information [Line Items]
Cash and cash equivalents	0	0	0	0
Trade accounts receivable, net	0	0
Inventories, net	0	0
Other current assets	0	0
Total current assets	0	0
Intercompany receivables, net	(1,751,125)	(1,771,921)
Property, buildings and equipment, net	0	0
Intangible assets, net	0	0
Goodwill and other intangibles, net	0	0
Investments in affiliates and other noncurrent assets	(6,016,787)	(5,631,472)
Total assets	(7,767,912)	(7,403,393)
Accounts payable	0	0
Other current liabilities	0	0
Total current liabilities	0	0
Intercompany payables, net	(1,751,125)	(1,771,921)
Long-term debt	0	0
Other noncurrent liabilities	0	0
Total stockholders' equity	(6,016,787)	(5,631,472)
Total liabilities and stockholders' equity	$ (7,767,912)	$ (7,403,393)

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STOCK-BASED COMPENSATION

9 Months Ended

Sep. 30, 2012

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

STOCK-BASED COMPENSATION

STOCK-BASED COMPENSATION

WESCO’s stock-based employee compensation plans are comprised of stock options, stock-settled stock appreciation rights, restricted stock units and performance-based awards. Compensation cost for all stock-based awards is measured at fair value on the date of grant, and compensation cost is recognized, net of estimated forfeitures, over the service period for awards expected to vest. The fair value of stock options and stock-settled appreciation rights is determined using the Black-Scholes valuation model. The fair value of restricted stock units is determined by the grant-date closing price of WESCO’s common stock. The forfeiture assumption is based on WESCO’s historical employee behavior that is reviewed on an annual basis. No dividends are assumed.

During the three and nine month periods ended September 30, 2012 and 2011, WESCO granted the following stock-settled stock appreciation rights, restricted stock units and performance-based awards at the following weighted average assumptions:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2012		2011		2012		2011
Stock-settled appreciation rights granted	850		15,156		257,932		399,330
Restricted stock units granted	2,400		—		74,724		53,852
Performance-based awards granted	—		—		46,804		—
Risk free interest rate	0.6	%	1.0	%	0.9	%	2.3	%
Expected life (in years)	5.0		5.0		5.0		5.0
Expected volatility	50	%	48	%	50	%	49	%

For the three and nine months ended September 30, 2012, the weighted average fair value per stock-settled appreciation right granted was $24.33 and $27.89, respectively. For the three and nine months ended September 30, 2011, the weighted average fair value per stock-settled appreciation right granted was $16.42 and $26.47, respectively. For the three and nine months ended September 30, 2012, the weighted average fair value per restricted stock unit granted was $62.49 and $64.27, respectively. For the nine months ended September 30, 2011, the weighted average fair value per restricted stock unit granted was $60.05. For the nine months ended September 30, 2012, the weighted average fair value per performance-based award granted was $75.72.

The following table sets forth a summary of stock options and stock-settled stock appreciation rights and related information for the nine months ended September 30, 2012:

	Awards		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (In Years)	Aggregate Intrinsic Value (In thousands)
Outstanding at December 31, 2011	4,266,533		$	39.64
Granted	257,932		64.12
Exercised	(697,037	)	32.46
Forfeited	(36,061	)	49.43
Outstanding at September 30, 2012	3,791,367		42.54		5.8	$	72,535
Exercisable at September 30, 2012	3,084,703		$	40.06	5.1	$	66,470

The following table sets forth a summary of restricted stock units and related information for the nine months ended September 30, 2012:

	Awards		Weighted Average Fair Value
Unvested at December 31, 2011	203,291		$	37.16
Granted	74,724		64.27
Vested	(78,305	)	25.37
Forfeited	(8,684	)	45.02
Unvested at September 30, 2012	191,026		$	52.24

Performance shares are awards for which the vesting will occur based on market or performance conditions. The following table sets forth a summary of performance-based awards for the nine months ended September 30, 2012:

	Awards		Weighted Average Fair Value
Unvested at December 31, 2011	—		—
Granted	46,804		$	75.72
Vested	—		—
Forfeited	(304	)	75.72
Unvested at June 30, 2012	46,500		$	75.72

The performance-based awards in the table above include 23,250 shares in which vesting of the ultimate number of shares underlying such awards will be dependent upon WESCO's total stockholder return in relation to the total stockholder return of a select group of peer companies over a three-year period. These awards are valued based upon a Monte Carlo simulation model, which is a valuation model that represents the characteristics of these grants. The probability of meeting the market criteria was considered when calculating the estimated fair market value on the date of grant. These awards were accounted for as awards with market conditions, which are recognized over the service period, regardless of whether the market conditions are achieved and the awards ultimately vest.

The fair value of the performance shares granted during the nine months ended September 30, 2012 were estimated using the following weighted-average assumptions:

Weighted Average Assumptions
Grant date share price	$	64.33
WESCO expected volatility	41.97		%
Peer group median volatility	33.40		%
Risk-free interest rate	0.40		%
Correlation	135.4		%

Vesting of the remaining 23,250 shares of performance-based awards in the table above will be dependent upon the three-year average growth rate of WESCO's net income. These awards are valued based upon the grant-date closing price of WESCO's common stock. These awards were accounted for as awards with performance conditions, in which stock-based compensation expense is recognized over the performance period based upon WESCO's determination of whether it is probable that the performance targets will be achieved.

WESCO recognized $3.2 million and $2.9 million of non-cash stock-based compensation expense, which is included in selling, general and administrative expenses, for the three months ended September 30, 2012 and 2011, respectively. WESCO recognized $11.7 million and $12.4 million of non-cash stock-based compensation expense, which is included in selling, general and administrative expenses, for the nine months ended September 30, 2012 and 2011, respectively. As of September 30, 2012, there was $21.4 million of total unrecognized compensation cost related to non-vested stock-based compensation arrangements for all awards previously made, of which approximately $3.4 million is expected to be recognized over the remainder of 2012, $11.4 million in 2013, $5.9 million in 2014 and $0.7 million in 2015.

During the nine months ended September 30, 2012 and 2011, the total intrinsic value of awards exercised was $22.4 million and $12.0 million, respectively. The total amount of cash received from the exercise of options was $0.2 million for both the nine months ended September 30, 2012 and 2011. The tax benefit associated with the exercise of awards for the nine months ended September 30, 2012 and 2011 totaled $5.4 million and $3.5 million, respectively, and was recorded as an increase to additional capital.

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SCHEDULE OF SHARE-BASED PAYMENT AWARD, PERFORMANCE-BASED AWARDS, VALUATION ASSUMPTIONS (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Jun. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
WESCO expected volatility	50.00%	48.00%	50.00%	49.00%
Risk free interest rate	0.60%	1.00%	0.90%	2.30%
Performance-based Awards - Peer Group Total Shareholder Return [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date share price			64.33
WESCO expected volatility			41.97%
Peer group mean volatility			33.40%
Risk free interest rate			0.40%
Correlation			135.40%

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SUMMARY OF PERFORMANCE-BASED AWARDS (Details) (Performance-based Awards [Member], USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Jun. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Performance-based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Unvested (in shares)	46,500		46,500		0
Granted (in shares)	0	0	46,804	0
Vested (in shares)			0
Forfeited (in shares)			(304)
Unvested, Weighted Average Fair Value (in dollars per share)	$ 75.72		$ 75.72		$ 0.00
Granted, Weighted Average Fair Value (in dollars per share)			$ 75.72
Vested in Period, Weighted Average Fair Value (in dollars per share)			$ 0.00
Forfeited in Period, Weighted Average Fair Value (in dollars per share)	$ 75.72		$ 75.72

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STOCK-BASED COMPENSATION (Details) (USD $)	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended			9 Months Ended
	Sep. 30, 2012	Jun. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Stock Appreciation Rights (SARs) [Member]	Jun. 30, 2011 Stock Appreciation Rights (SARs) [Member]	Sep. 30, 2012 Stock Appreciation Rights (SARs) [Member]	Sep. 30, 2011 Stock Appreciation Rights (SARs) [Member]	Sep. 30, 2012 Restricted Stock Units (RSUs) [Member]	Sep. 30, 2012 Restricted Stock Units (RSUs) [Member]	Sep. 30, 2011 Restricted Stock Units (RSUs) [Member]	Dec. 31, 2011 Restricted Stock Units (RSUs) [Member]	Sep. 30, 2012 Performance-based Awards [Member]	Dec. 31, 2011 Performance-based Awards [Member]	Sep. 30, 2012 Performance-based Awards - Peer Group Total Shareholder Return [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, Weighted Average Fair Value (in dollars per share)					$ 24.33	$ 16.42	$ 27.89	$ 26.47	$ 62.49	$ 64.27	$ 60.05		$ 75.72
Performance-based awards outstanding (in shares)									191,026	191,026		203,291	46,500	0	23,250
Stock-based compensation expense	$ 3,200,000	$ 2,900,000	$ 11,722,000	$ 12,360,000
Total unrecognized compensation cost	21,400,000		21,400,000
Compensation cost expected to be recognized over the remainder of 2012			3,400,000
Compensation cost expected to be recognized in 2013			11,400,000
Compensation cost expected to be recognized in 2014			5,900,000
Compensation cost expected to be recognized in 2015			700,000
Total intrinsic value of awards exercised			22,400,000	12,000,000
Cash received from exercise of options			200,000
Tax benefit associated with exercise of awards			$ 5,400,000	$ 3,500,000

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SCHEDULE OF EARNINGS PER SHARE, BASIC AND DILUTED (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Jun. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Earnings Per Share [Abstract]
Net income attributable to WESCO International, Inc.	$ 63,415	$ 53,890	$ 175,267	$ 141,402
Weighted average common shares outstanding used in computing basic earnings per share (in shares)	43,705,000	43,289,000	43,596,000	43,181,000
Common shares issuable upon exercise of dilutive stock options (in shares)	1,032,000	976,000	1,199,000	1,202,000
Common shares issuable from contingently convertible debentures (in shares)	6,036,000	4,206,000	6,262,000	5,400,000
Weighted average common shares outstanding and common share equivalents used in computing diluted earnings per share (in shares)	50,773,000	48,471,000	51,057,000	49,783,000
Earnings Per Share, Basic and Diluted [Abstract]
Basic (in dollars per share)	$ 1.45	$ 1.24	$ 4.02	$ 3.27
Diluted (in dollars per share)	$ 1.25	$ 1.11	$ 3.43	$ 2.84

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ACQUISITIONS

9 Months Ended

Sep. 30, 2012

Business Combinations [Abstract]

ACQUISITIONS

ACQUISITIONS

The following table sets forth the consideration paid for acquisitions:

Nine Months Ended September 30	2012			2011
(In thousands)
Details of acquisitions:
Fair value of assets acquired	$	215,303		$	11,187
Fair value of liabilities assumed	(14,180		)	(3,021		)
Cash paid for acquisitions	$	201,123		$	8,166

2011 Acquisition of RECO, LLC

On March 14, 2011, WESCO Distribution, Inc. ("WESCO Distribution") completed its acquisition of RECO, LLC ("RECO"), an automation, controls, and electrical distributor located in the midwest and southeastern regions of the United States with approximately $25 million in annual sales. WESCO funded the purchase price paid at closing with cash and borrowings under the Receivables Facility. The purchase price was allocated to the respective assets and liabilities based upon their estimated fair values as of the acquisition date. The excess of the purchase price over the fair value of the net assets acquired has been allocated to goodwill valued at $6.0 million. Management believes the majority of goodwill will be deductible for tax purposes.

2012 Acquisitions of RS Electronics, Trydor Industries (Canada), Ltd., and Conney Safety Products, LLC

On January 3, 2012, WESCO Distribution, Inc. completed its acquisition of RS Electronics, a leading North American distributor of electronic and electrical products serving primarily the industrial, medical equipment, automotive, and contract manufacturing end markets with eight branches located in the midwest and southeastern United States and approximately $60 million in annual sales. WESCO funded the purchase price paid at closing with cash and borrowings under the Receivables Facility.

On July 5, 2012, WESCO completed its acquisition of Trydor Industries (Canada), Ltd. (“Trydor”) through one of its wholly-owned Canadian subsidiaries.  Trydor Industries (Canada), Ltd. is a full-line distributor of high-voltage electrical products and services addressing the transmission, substation and distribution network needs for utilities, independent power producers and utility contractors in Canada with approximately $35 million in annual sales.  WESCO funded the purchase price paid at closing with borrowings under the Revolving Credit Facility.

On July 10, 2012, WESCO Distribution completed its acquisition of Conney Safety Products, LLC (“Conney Safety”), a premier distributor of MRO safety products with approximately $85 million in annual sales.  WESCO funded the purchase price paid at closing with borrowings under the Receivables Facility.

For all 2012 acquisitions, the purchase price was allocated to the respective assets and liabilities based upon their estimated fair values as of the acquisition date. The purchase price allocation of RS Electronics was finalized in the first quarter of 2012. The purchase price allocation of Conney Safety and Trydor will be finalized during the fourth quarter of 2012. The excess of the purchase price over the fair value of the net assets acquired, including intangible assets, has been allocated to goodwill. The fair value of intangible assets was estimated by management and the allocation resulted in goodwill and intangible assets of $114.9 million and $57.0 million, respectively. Management believes the majority of goodwill will be deductible for tax purposes. The intangible assets for all 2012 acquisitions include customer relationships of $49.2 million amortized over 10 to 12 years, supplier relationships of $2.7 million amortized over 10 years and trademarks of $5.1 million. Certain trademarks have been assigned an indefinite life while others are being amortized over 4 to 15 years. No residual value is estimated for the intangible assets.

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EARNINGS PER SHARE (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Jun. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Convertible Senior Debentures Due in 2029 [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.00%		6.00%
Convertible Senior Debentures Due in 2026 [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.75%		1.75%
Stock Appreciation Rights (SARs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			1,000,000	1,200,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Weighted Average Exercise Price (in dollars per share)			$ 64	$ 62
Convertible Debt Securities [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Effect of Dilutive Securities on Earnings Per Share (in dollars per share)	$ (0.17)	$ (0.11)	$ (0.48)	$ (0.35)
Convertible Debt Securities [Member] | Convertible Senior Debentures Due in 2029 [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Debt Instrument, Convertible, Conversion Price (in dollars per share)	$ 28.87		$ 28.87
Earnings Per Share Dilution Limit (in shares)			11,949,513

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SUBSEQUENT EVENTS (Details) (Acquisition [Member], Eeecol Electric Corporation [Member])	0 Months Ended	9 Months Ended
	Oct. 15, 2012 CAD customers	Sep. 30, 2012 USD ($)	Oct. 15, 2012 CANADA location	Oct. 15, 2012 South America [Member] location
Subsequent Event [Line Items]
Business Acquisition, Effective Date of Acquisition	10/15/2012
Business Acquisition, Cost of Acquired Entity, Purchase Price	1,140,000,000
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period		$ 900,000,000
Business Acquisition, Number of Locations Acquired			57	20
Business Acquisition, Number of Customers Acquired	20,000

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CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Current Assets:
Cash and cash equivalents	$ 107,637	$ 63,869
Trade accounts receivable, net of allowance for doubtful accounts of $20,811 and $21,590 in 2012 and 2011, respectively	1,020,454	939,422
Other accounts receivable	48,246	43,442
Inventories, net	662,764	626,967
Current deferred income taxes	29,431	28,217
Income taxes receivable	11,284	12,206
Prepaid expenses and other current assets	26,109	23,297
Total current assets	1,905,925	1,737,420
Property, buildings and equipment, net of accumulated depreciation of $189,971 and $190,385 in 2012 and 2011, respectively	140,998	133,550
Intangible assets, net	204,572	156,874
Goodwill	1,127,001	1,008,127
Deferred income taxes	17,926	18,090
Other assets	23,572	24,391
Total assets	3,419,994	3,078,452
Current Liabilities:
Accounts payable	693,177	642,777
Accrued payroll and benefit costs	63,103	76,915
Short-term debt	22,848	3,261
Current portion of long-term debt	2,137	3,150
Bank overdrafts	57,681	47,489
Other current liabilities	71,090	72,254
Total current liabilities	910,036	845,846
Long-term debt, net of discount of $174,485 and $175,908 in 2012 and 2011, respectively	696,758	642,922
Deferred income taxes	244,175	223,005
Other noncurrent liabilities	24,495	20,769
Total liabilities	1,875,464	1,732,542
Stockholders' Equity:
Preferred stock, $.01 par value; 20,000,000 shares authorized, no shares issued or outstanding	0	0
Additional capital	1,053,493	1,036,867
Retained earnings	1,066,216	891,789
Treasury stock, at cost; 18,023,348 and 17,936,923 shares in 2012 and 2011, respectively	(600,059)	(593,329)
Accumulated other comprehensive income	24,354	10,057
Total WESCO International stockholders' equity	1,544,622	1,345,998
Noncontrolling interest	(92)	(88)
Total stockholders' equity	1,544,530	1,345,910
Total liabilities and stockholders' equity	3,419,994	3,078,452
Common Stock [Member]
Stockholders' Equity:
Common stock	575	571
Common Class B [Member]
Stockholders' Equity:
Common stock	$ 43	$ 43

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ORGANIZATION

9 Months Ended

Sep. 30, 2012

Organization, Consolidation and Presentation of Financial Statements [Abstract]

ORGANIZATION

ORGANIZATION

WESCO International, Inc. and its subsidiaries (collectively, “WESCO”), headquartered in Pittsburgh, Pennsylvania, is a full-line distributor of electrical, industrial and communications maintenance, repair and operating (“MRO”) and original equipment manufactures (“OEM”) products, construction materials, and advanced supply chain management and logistics services used primarily in the industrial, construction, utility and commercial, institutional and government markets. We serve over 65,000 active customers globally, through approximately 400 full service branches and eight distribution centers located primarily in the United States, Canada and Mexico, with offices in 11 additional countries.

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INCOME TAXES (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Jun. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Effective tax rate	29.90%	29.70%	29.80%	29.20%
Federal statutory rate			35.00%
Discrete adjustments			$ 3.2	$ 2.1
Unrecognized tax benefits	20.1		20.1		20.9
Deferred tax asset					23.1
Unrecognized tax benefits that would impact effective tax rate	20.2		20.2		19.7
Significant change in unrecognized tax benefits that is reasonably possible	15.5		15.5
Liability for interest related to uncertain tax positions	8.1		8.1		11.4
Decrease in interest related to unrecognized tax benefits			$ (3.3)

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ACCOUNTING POLICIES (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Accounting Policies [Abstract]
Fixed Rate Debt, Par Value	$ 494.9	$ 495.0
Fixed Rate Debt, Fair Value Disclosures	$ 892.9	$ 850.9

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OTHER FINANCIAL INFORMATION (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012
2017 Senior Subordinated Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 150.0
Debt Instrument, Interest Rate, Stated Percentage	7.50%
Convertible Senior Debentures Due in 2029 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 344.9

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ACQUISITIONS - ACQUISITIONS (Details) (USD $) In Millions, unless otherwise specified		3 Months Ended	12 Months Ended	0 Months Ended	9 Months Ended	0 Months Ended	12 Months Ended	0 Months Ended	12 Months Ended		9 Months Ended
	Sep. 30, 2012	Mar. 14, 2011 RECO, LLC [Member]	Dec. 31, 2011 RECO, LLC [Member]	Jan. 03, 2012 RS Electronics [Member]	Sep. 30, 2012 RS Electronics [Member]	Jul. 05, 2012 Trydor Industries (Canada), Ltd. [Member]	Dec. 31, 2011 Trydor Industries (Canada), Ltd. [Member]	Jul. 10, 2012 Conney Safety Products, LLC [Member]	Dec. 31, 2011 Conney Safety Products, LLC [Member]	Sep. 30, 2012 Customer Relationships [Member]	Sep. 30, 2012 Customer Relationships [Member] Minimum [Member] Y	Sep. 30, 2012 Customer Relationships [Member] Maximum [Member] Y	Sep. 30, 2012 Supplier Relationships [Member] Y	Sep. 30, 2012 Trademarks [Member] Minimum [Member] Y	Sep. 30, 2012 Trademarks [Member] Maximum [Member] Y
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition		March 14, 2011		January 3, 2012		July 5, 2012		July 10, 2012
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period			$ 25		$ 60		$ 35		$ 85
Business Acquisition, Purchase Price Allocation, Goodwill Amount	114.9	6.0
Business Acquisition, Purchase Price Allocation, Intangible Assets	57.0
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets										49.2			2.7
Acquired Finite-lived Intangible Asset, Weighted Average Useful Life											10	12	10	4	15
Acquired Intangible Asset, Trademark	$ 5.1

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ACCOUNTING POLICIES

9 Months Ended

Sep. 30, 2012

Accounting Policies [Abstract]

ACCOUNTING POLICIES

ACCOUNTING POLICIES

Basis of Presentation

The unaudited condensed consolidated financial statements of WESCO have been prepared in accordance with Rule 10-01 of Regulation S-X of the Securities and Exchange Commission (the “SEC”). The unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in WESCO’s 2011 Annual Report on Form 10-K filed with the SEC. The December 31, 2011 condensed consolidated balance sheet data was derived from audited financial statements but does not include all disclosures required by accounting principles generally accepted in the United States.

The unaudited condensed consolidated balance sheet as of September 30, 2012, the unaudited condensed consolidated statements of income for the three and nine months ended September 30, 2012 and 2011, respectively, and the unaudited condensed consolidated statements of cash flows for the nine months ended September 30, 2012 and 2011, respectively, in the opinion of management, have been prepared on the same basis as the audited consolidated financial statements and include all adjustments necessary for the fair statement of the results of the interim periods. All adjustments reflected in the unaudited condensed consolidated financial statements are of a normal recurring nature unless indicated. Results for the interim periods presented are not necessarily indicative of the results to be expected for the full year.

Reclassification

Certain prior period amounts have been reclassified to conform with the current period's financial statement presentation.

Fair Value of Financial Instruments

The Company measures the fair value of financial assets and liabilities based on the guidance of ASC 820, "Fair Value Measurements and Disclosures," which defines fair value, establishes a framework for measuring fair value, and expands disclosures about fair value measurements.

ASC 820 establishes a fair value hierarchy, which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. ASC 820 describes three levels of inputs that may be used to measure fair value:

Level 1 inputs are quoted prices in active markets for identical assets or liabilities.

Level 2 inputs include inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices in active markets for similar assets and liabilities, quoted prices for identical or similar assets or liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of assets or liabilities.

Level 3 inputs are unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions.

At September 30, 2012, the carrying value of WESCO’s 7.50% Senior Subordinated Notes due 2017 (the "2017 Notes") and 6.0% Convertible Senior Debentures due 2029 (the "2029 Debentures") was $494.9 million and the fair value was approximately $892.9 million. At December 31, 2011, the carrying value of WESCO’s 2017 Notes and 2029 Debentures was $495.0 million and the fair value was approximately $850.9 million. The fair value of WESCO’s 2017 Notes and 2029 Debentures is based on quoted prices in active markets and is therefore classified as Level 1 within the valuation hierarchy. The reported carrying amounts of WESCO’s other debt instruments approximate their fair values and are classified as Level 2 within the valuation hierarchy. Other debt instruments included in Level 2 are valued using a market approach, utilizing interest rates and other relevant information generated by market transactions involving similar instruments.

Recent Accounting Pronouncements

In July 2012, the Financial Accounting Standards Board (the "FASB"), issued updated guidance on the periodic testing of indefinite-lived intangible assets, other than goodwill, for impairment. This updated guidance will allow companies the option to first assess qualitative factors to determine if it is more-likely-than-not that an indefinite-lived intangible asset might be impaired and whether it is necessary to perform the quantitative impairment test required under current accounting standards. This guidance is effective for annual and interim impairment tests performed for fiscal years beginning after September 15, 2012. WESCO will adopt this guidance in 2013. Adoption of this guidance is not expected to have a material impact on WESCO's financial position, results of operations or cash flows.

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CONSOLIDATED BALANCE SHEETS PARENTHETICAL (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Allowance for doubtful accounts	$ 20,496	$ 21,590
Accumulated depreciation	195	190
Debt discount	$ 173,685	$ 175,908
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	20,000,000	20,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Treasury stock, shares (in shares)	18,042,118	17,936,923
Common Stock [Member]
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	210,000,000	210,000,000
Common stock, shares issued (in shares)	57,420,260	57,021,523
Common stock, shares outstanding (in shares)	43,717,573	43,424,031
Common Class B [Member]
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	20,000,000	20,000,000
Common stock, shares issued (in shares)	4,339,431	4,339,431
Common stock, shares outstanding (in shares)	0	0

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ACQUISITIONS (Tables)

9 Months Ended

Sep. 30, 2012

Business Combinations [Abstract]

Schedule of Business Acquisitions, by Acquisition [Table Text Block]

The following table sets forth the consideration paid for acquisitions:

Nine Months Ended September 30	2012			2011
(In thousands)
Details of acquisitions:
Fair value of assets acquired	$	215,303		$	11,187
Fair value of liabilities assumed	(14,180		)	(3,021		)
Cash paid for acquisitions	$	201,123		$	8,166

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Document and Entity Information	9 Months Ended
	Sep. 30, 2012	Oct. 29, 2012
Entity Information [Line Items]
Entity Registrant Name	WESCO INTERNATIONAL INC.
Entity Central Index Key	0000929008
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding (in shares)		43,746,966

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STOCK-BASED COMPENSATION (Tables)

9 Months Ended

Sep. 30, 2012

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

During the three and nine month periods ended September 30, 2012 and 2011, WESCO granted the following stock-settled stock appreciation rights, restricted stock units and performance-based awards at the following weighted average assumptions:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2012		2011		2012		2011
Stock-settled appreciation rights granted	850		15,156		257,932		399,330
Restricted stock units granted	2,400		—		74,724		53,852
Performance-based awards granted	—		—		46,804		—
Risk free interest rate	0.6	%	1.0	%	0.9	%	2.3	%
Expected life (in years)	5.0		5.0		5.0		5.0
Expected volatility	50	%	48	%	50	%	49	%

Schedule of Share-based Compensation, Stock Options and Stock Appreciation Rights Award Activity [Table Text Block]

The following table sets forth a summary of stock options and stock-settled stock appreciation rights and related information for the nine months ended September 30, 2012:

	Awards		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (In Years)	Aggregate Intrinsic Value (In thousands)
Outstanding at December 31, 2011	4,266,533		$	39.64
Granted	257,932		64.12
Exercised	(697,037	)	32.46
Forfeited	(36,061	)	49.43
Outstanding at September 30, 2012	3,791,367		42.54		5.8	$	72,535
Exercisable at September 30, 2012	3,084,703		$	40.06	5.1	$	66,470

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

The following table sets forth a summary of restricted stock units and related information for the nine months ended September 30, 2012:

	Awards		Weighted Average Fair Value
Unvested at December 31, 2011	203,291		$	37.16
Granted	74,724		64.27
Vested	(78,305	)	25.37
Forfeited	(8,684	)	45.02
Unvested at September 30, 2012	191,026		$	52.24

Schedule of Nonvested Performance-based Units Activity [Table Text Block]

The following table sets forth a summary of performance-based awards for the nine months ended September 30, 2012:

	Awards		Weighted Average Fair Value
Unvested at December 31, 2011	—		—
Granted	46,804		$	75.72
Vested	—		—
Forfeited	(304	)	75.72
Unvested at June 30, 2012	46,500		$	75.72

Schedule of Share-based Payment Award, Performance-based Awards, Valuation Assumptions [Table Text Block]

The fair value of the performance shares granted during the nine months ended September 30, 2012 were estimated using the following weighted-average assumptions:

Weighted Average Assumptions
Grant date share price	$	64.33
WESCO expected volatility	41.97		%
Peer group median volatility	33.40		%
Risk-free interest rate	0.40		%
Correlation	135.4		%

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CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Jun. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net sales	$ 1,656,186	$ 1,580,376	$ 4,934,938	$ 4,536,196
Cost of goods sold	1,317,432	1,264,745	3,940,762	3,627,666
Selling, general and administrative expense	225,812	216,205	685,130	644,176
Depreciation and amortization	9,910	7,674	26,431	22,861
Income from operations	103,032	91,752	282,615	241,493
Interest expense, net	12,654	15,079	33,093	41,651
Income before income taxes	90,378	76,673	249,522	199,842
Provision for income taxes	26,987	22,783	74,259	58,440
Net income	63,391	53,890	175,263	141,402
Net income attributable to noncontrolling interest	(24)	0	(4)	0
Net income attributable to WESCO International, Inc.	63,415	53,890	175,267	141,402
Comprehensive Income:
Foreign currency translation adjustment	10,652	(26,411)	14,297	(16,685)
Comprehensive income attributable to WESCO International, Inc.	$ 74,067	$ 27,479	$ 189,564	$ 124,717
Earnings per share attributable to WESCO International, Inc.
Basic (in dollars per share)	$ 1.45	$ 1.24	$ 4.02	$ 3.27
Diluted (in dollars per share)	$ 1.25	$ 1.11	$ 3.43	$ 2.84

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COMMITMENTS AND CONTINGENCIES

9 Months Ended

Sep. 30, 2012

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES

WESCO is a co-defendant in a lawsuit filed in a state court in Indiana in which a customer alleges that WESCO sold defective products manufactured or remanufactured by others and is seeking monetary damages in the amount of approximately $50 million. WESCO has denied any liability, continues to believe that it has meritorious defenses and intends to vigorously defend itself against these allegations. Accordingly, no liability was recorded for this matter as of September 30, 2012. Furthermore, due to the uncertainty of this litigation, WESCO is not currently able to reasonably estimate the possible loss or range of loss from this legal proceeding.

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EMPLOYEE BENEFIT PLANS

9 Months Ended

Sep. 30, 2012

Compensation and Retirement Disclosure [Abstract]

EMPLOYEE BENEFIT PLANS

EMPLOYEE BENEFIT PLANS

A majority of WESCO’s employees are covered by defined contribution retirement savings plans for their services rendered subsequent to WESCO’s formation. WESCO also offers a deferred compensation plan for select individuals. For U.S. participants, WESCO will make contributions in an amount equal to 50% of the participant’s total monthly contributions up to a maximum of 6% of eligible compensation. For Canadian participants, WESCO will make contributions in an amount ranging from 1% to 7% of the participant’s eligible compensation based on years of continuous service. In addition, employer contributions may be made at the discretion of the Board of Directors. For the nine months ended September 30, 2012 and 2011, WESCO incurred charges of $24.2 million and $19.5 million, respectively, for all such plans. Contributions are made in cash to defined contribution retirement savings plans. The deferred compensation plan is an unfunded plan. Employees have the option to transfer balances allocated to their accounts into any of the available investment options, including WESCO common stock.

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ACQUISITIONS - SCHEDULE OF BUSINESS ACQUISITIONS (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Business Acquisition [Line Items]
Fair value of assets acquired	$ 215,303	$ 11,187
Fair value of liabilities assumed	(14,180)	(3,021)
Cash paid for acquisitions	$ 201,123	$ 8,166

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EARNINGS PER SHARE (Tables)

9 Months Ended

Sep. 30, 2012

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

The following table sets forth the details of basic and diluted earnings per share:

	Three Months Ended
	September 30,
	2012		2011
Net income attributable to WESCO International, Inc.	$	63,415	$	53,890
Weighted average common shares outstanding used in computing basic earnings per share	43,705		43,289
Common shares issuable upon exercise of dilutive equity awards	1,032		976
Common shares issuable from contingently convertible debentures (see below for basis of calculation)	6,036		4,206
Weighted average common shares outstanding and common share equivalents used in computing diluted earnings per share	50,773		48,471
Earnings per share attributable to WESCO International, Inc.
Basic	$	1.45	$	1.24
Diluted	$	1.25	$	1.11

	Nine Months Ended
	September 30,
	2012		2011
Net income attributable to WESCO International, Inc.	$	175,267	$	141,402
Weighted average common shares outstanding used in computing basic earnings per share	43,596		43,181
Common shares issuable upon exercise of dilutive equity awards	1,199		1,202
Common shares issuable from contingently convertible debentures (see below for basis of calculation)	6,262		5,400
Weighted average common shares outstanding and common share equivalents used in computing diluted earnings per share	51,057		49,783
Earnings per share attributable to WESCO International, Inc.
Basic	$	4.02	$	3.27
Diluted	$	3.43	$	2.84

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SUBSEQUENT EVENTS

9 Months Ended

Sep. 30, 2012

Subsequent Events [Abstract]

SUBSEQUENT EVENTS

SUBSEQUENT EVENTS

On October 15, 2012, WESCO entered into a definitive agreement to acquire EECOL Electric Corporation, headquartered in Calgary, Alberta, Canada, and various affiliated companies for a purchase price of approximately CAD$1.14 billion. EECOL Electric is one of Canada's premier full-line distributors of electrical equipment, products and services with approximately $0.9 billion in annual sales, 57 locations across Canada and 20 in South America, and more than 20,000 customers. Consummation of the transaction is subject to certain conditions, including approval under the Canadian Competition Act. The acquisition is expected to be financed utilizing a new institutional term loan to be entered into on or before closing, as well as WESCO's existing credit facilities. Closing is expected to occur during the fourth quarter of 2012.

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INCOME TAXES

9 Months Ended

Sep. 30, 2012

Income Tax Disclosure [Abstract]

INCOME TAXES

INCOME TAXES

The effective tax rate for the three months ended September 30, 2012 and 2011 was 29.9% and 29.7% respectively, and the effective tax rate for the nine months ended September 30, 2012 and 2011 was 29.8% and 29.2%, respectively. WESCO’s three and nine month effective tax rates are lower than the federal statutory rate of 35% primarily due to benefits resulting from the recapitalization of Canadian operations, which are partially offset by nondeductible expenses, state taxes and foreign rate differences. The effective tax rate for the nine months ended September 30, 2012 and 2011 reflects beneficial discrete adjustments totaling $3.2 million and $2.1 million, respectively, primarily related to state taxes and changes in uncertain tax positions. The beneficial discrete adjustments in the effective tax rate for the three months ended September 30, 2012 and 2011 were immaterial.

The total amount of net unrecognized tax benefits were $20.1 million and $20.9 million as of September 30, 2012 and December 31, 2011, respectively. A related deferred tax asset in the amount of $23.1 million excluding interest was recorded in 2011. If these tax benefits were recognized in the consolidated financial statements, the portion of these amounts that would reduce WESCO’s effective tax rate would be $20.2 million and $19.7 million, respectively. This amount would be offset by a decrease in the corresponding deferred tax asset discussed above.

During the next twelve months, it is reasonably possible that the amount of unrecognized tax benefits will decrease by as much as $15.5 million (all of which will be offset by the reversal of a deferred tax asset) due to possible resolution of federal, state and/or foreign tax examinations and/or the expiration of statutes of limitations. Management does not expect this decrease to have an impact on the effective tax rate.

WESCO records interest related to uncertain tax positions as a part of interest expense in the consolidated statement of income. Penalties are recognized as part of income tax expense. As of September 30, 2012 and December 31, 2011, WESCO had an accrued liability for interest related to uncertain tax positions of $8.1 million and $11.4 million, respectively. During the nine months ended September 30, 2012, accrued interest and net interest expense decreased by $3.3 million primarily as a result of a favorable Internal Revenue Service appeals settlement in the first quarter of 2012 related to the years 2000 to 2006. There were no material penalties recorded during the three or nine months ended September 30, 2012 or 2011.

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OTHER FINANCIAL INFORMATION

9 Months Ended

Sep. 30, 2012

Condensed Financial Information [Abstract]

OTHER FINANCIAL INFORMATION

OTHER FINANCIAL INFORMATION

WESCO Distribution, a 100% owned subsidiary of WESCO International, Inc. ("WESCO International"), has outstanding $150.0 million in aggregate principal amount of 7.50% Senior Subordinated Notes due 2017 (the "2017 Notes"), and WESCO International has outstanding $344.9 million in aggregate principal amount of 2029 Debentures. The 2017 Notes are fully and unconditionally guaranteed by WESCO International on a subordinated basis to all existing and future senior indebtedness of WESCO International. The 2029 Debentures are fully and unconditionally guaranteed by WESCO Distribution on a senior subordinated basis to all existing and future senior indebtedness of WESCO Distribution.

Condensed consolidating financial information for WESCO International, WESCO Distribution and the non-guarantor subsidiaries is as follows:

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATING BALANCE SHEETS

(unaudited)

	September 30, 2012
	(In thousands)
	WESCO International, Inc.		WESCO Distribution, Inc.		Non-Guarantor Subsidiaries		Consolidating and Eliminating Entries			Consolidated
Cash and cash equivalents	$	3	$	75,673	$	31,961	$	—		$	107,637
Trade accounts receivable, net	—		—		1,020,454		—			1,020,454
Inventories, net	—		337,316		325,448		—			662,764
Other current assets	—		38,423		76,647		—			115,070
Total current assets	3		451,412		1,454,510		—			1,905,925
Intercompany receivables, net	—		—		1,751,125		(1,751,125		)	—
Property, buildings and equipment, net	—		59,543		81,455		—			140,998
Intangible assets, net	—		6,360		198,212		—			204,572
Goodwill and other intangibles, net	—		246,125		880,876		—			1,127,001
Investments in affiliates and other noncurrent assets	2,426,032		3,601,264		30,989		(6,016,787		)	41,498
Total assets	$	2,426,035	$	4,364,704	$	4,397,167	$	(7,767,912	)	$	3,419,994
Accounts payable	$	—	$	444,291	$	248,886	$	—		$	693,177
Other current liabilities	2,578		57,161		157,120		—			216,859
Total current liabilities	2,578		501,452		406,006		—			910,036
Intercompany payables, net	679,405		1,071,720		—		(1,751,125		)	—
Long-term debt	171,244		187,988		337,526		—			696,758
Other noncurrent liabilities	28,126		182,443		58,101		—			268,670
Stockholders’ equity	1,544,682		2,421,101		3,595,534		(6,016,787		)	1,544,530
Total liabilities and stockholders’ equity	$	2,426,035	$	4,364,704	$	4,397,167	$	(7,767,912	)	$	3,419,994

	December 31, 2011
	(In thousands)
	WESCO International, Inc.		WESCO Distribution, Inc.		Non-Guarantor Subsidiaries		Consolidating and Eliminating Entries			Consolidated
Cash and cash equivalents	$	5	$	44,412	$	19,452	$	—		$	63,869
Trade accounts receivable, net	—		—		939,422		—			939,422
Inventories, net	—		341,423		285,544		—			626,967
Other current assets	270		32,548		74,344		—			107,162
Total current assets	275		418,383		1,318,762		—			1,737,420
Intercompany receivables, net	—		—		1,771,921		(1,771,921		)	—
Property, buildings and equipment, net	—		54,038		79,512		—			133,550
Intangible assets, net	—		6,981		149,893		—			156,874
Goodwill and other intangibles, net	—		246,125		762,002		—			1,008,127
Investments in affiliates and other noncurrent assets	2,219,323		3,422,885		31,745		(5,631,472		)	42,481
Total assets	$	2,219,598	$	4,148,412	$	4,113,835	$	(7,403,393	)	$	3,078,452
Accounts payable	$	—	$	423,509	$	219,268	$	—		$	642,777
Other current liabilities	7,797		56,035		139,237		—			203,069
Total current liabilities	7,797		479,544		358,505		—			845,846
Intercompany payables, net	668,447		1,103,474		—		(1,771,921		)	—
Long-term debt	169,054		188,081		285,787		—			642,922
Other noncurrent liabilities	28,131		163,177		52,466		—			243,774
Stockholders’ equity	1,346,169		2,214,136		3,417,077		(5,631,472		)	1,345,910
Total liabilities and stockholders’ equity	$	2,219,598	$	4,148,412	$	4,113,835	$	(7,403,393	)	$	3,078,452

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF INCOME AND COMPREHENSIVE INCOME

(unaudited)

	Three Months Ended September 30, 2012
	(In thousands)
	WESCO International, Inc.		WESCO Distribution, Inc.		Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net sales	$	—	$	868,289	$	816,211		$	(28,314	)	$	1,656,186
Cost of goods sold	—		689,522		656,224			(28,314		)	1,317,432
Selling, general and administrative expenses	25		121,006		104,781			—			225,812
Depreciation and amortization	—		3,980		5,930			—			9,910
Results of affiliates’ operations	69,571		44,115		—			(113,686		)	—
Interest expense, net	6,095		3,706		2,853			—			12,654
Provision for income taxes	—		24,679		2,308			—			26,987
Net income (loss)	63,451		69,511		44,115			(113,686		)	63,391
Less: Net loss attributable to noncontrolling interest	—		—		(24		)	—			(24		)
Net income (loss) attributable to WESCO International, Inc.	$	63,451	$	69,511	$	44,139		$	(113,686	)	$	63,415
Comprehensive income:
Foreign currency translation adjustment	10,652		10,652		10,652			(21,304		)	10,652
Comprehensive income attributable to WESCO International, Inc.	$	74,103	$	80,163	$	54,791		$	(134,990	)	$	74,067

	Three Months Ended September 30, 2011
	(In thousands)
	WESCO International, Inc.			WESCO Distribution, Inc.			Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net sales	$	—		$	847,745		$	764,880		$	(32,249	)	$	1,580,376
Cost of goods sold	—			680,897			616,097			(32,249		)	1,264,745
Selling, general and administrative expenses	18			134,671			81,516			—			216,205
Depreciation and amortization	—			2,780			4,894			—			7,674
Results of affiliates’ operations	60,336			53,846			—			(114,182		)	—
Interest expense, net	6,428			5,573			3,078			—			15,079
Provision for income taxes	—			17,334			5,449			—			22,783
Net income (loss) attributable to WESCO International, Inc.	$	53,890		$	60,336		$	53,846		$	(114,182	)	$	53,890
Comprehensive income:
Foreign currency translation adjustment	(26,411		)	(26,411		)	(26,411		)	52,822			(26,411		)
Comprehensive income attributable to WESCO International, Inc.	$	27,479		$	33,925		$	27,435		$	(61,360	)	$	27,479

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF INCOME AND COMPREHENSIVE INCOME

(unaudited)

	Nine Months Ended September 30, 2012
	(In thousands)
	WESCO International, Inc.		WESCO Distribution, Inc.		Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net sales	$	—	$	2,602,688	$	2,432,239		$	(99,989	)	$	4,934,938
Cost of goods sold	—		2,074,165		1,966,586			(99,989		)	3,940,762
Selling, general and administrative expenses	49		413,540		271,541			—			685,130
Depreciation and amortization	—		11,231		15,200			—			26,431
Results of affiliates’ operations	192,729		164,338		—			(357,067		)	—
Interest expense, net	17,417		7,667		8,009			—			33,093
Provision for income taxes	—		67,694		6,565			—			74,259
Net income (loss)	175,263		192,729		164,338			(357,067		)	175,263
Less: Net loss attributable to noncontrolling interest	—		—		(4		)	—			(4		)
Net income (loss) attributable to WESCO International, Inc.	$	175,263	$	192,729	$	164,342		$	(357,067	)	$	175,267
Comprehensive income:
Foreign currency translation adjustment	14,297		14,297		14,297			(28,594		)	14,297
Comprehensive income attributable to WESCO International, Inc.	$	189,560	$	207,026	$	178,639		$	(385,661	)	$	189,564

	Nine Months Ended September 30, 2011
	(In thousands)
	WESCO International, Inc.			WESCO Distribution, Inc.			Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net sales	$	—		$	2,386,968		$	2,223,588		$	(74,360	)	$	4,536,196
Cost of goods sold	—			1,913,902			1,788,124			(74,360		)	3,627,666
Selling, general and administrative expenses	62			404,112			240,002			—			644,176
Depreciation and amortization	—			8,228			14,633			—			22,861
Results of affiliates’ operations	159,957			156,191			—			(316,148		)	—
Interest expense, net	18,493			12,839			10,319			—			41,651
Provision for income taxes	—			44,121			14,319			—			58,440
Net income (loss) attributable to WESCO International, Inc.	$	141,402		$	159,957		$	156,191		$	(316,148	)	$	141,402
Comprehensive income:
Foreign currency translation adjustment	(16,685		)	(16,685		)	(16,685		)	33,370			(16,685		)
Comprehensive income attributable to WESCO International, Inc.	$	124,717		$	143,272		$	139,506		$	(282,778	)	$	124,717

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS

(unaudited)

	Nine Months Ended September 30, 2012
	(In thousands)
	WESCO International, Inc.			WESCO Distribution, Inc.			Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries		Consolidated
Net cash (used) provided by operating activities	$	(8,490	)	$	201,343		$	(3,170	)	$	—	$	189,683
Investing activities:
Capital expenditures	—			(15,654		)	(3,815		)	—		(19,469		)
Acquisition payments	—			(201,123		)	—			—		(201,123		)
Other	—			51			—			—		51
Net cash used in investing activities	—			(216,726		)	(3,815		)	—		(220,541		)
Financing activities:
Net borrowings	10,957			36,589			19,259			—		66,805
Equity transactions	(2,469		)	—			—			—		(2,469		)
Other	—			10,055			—			—		10,055
Net cash provided by financing activities	8,488			46,644			19,259			—		74,391
Effect of exchange rate changes on cash and cash equivalents	—			—			235			—		235
Net change in cash and cash equivalents	(2.4		)	31,261			12,509			—		43,768
Cash and cash equivalents at the beginning of year	5			44,412			19,452			—		63,869
Cash and cash equivalents at the end of period	$	3		$	75,673		$	31,961		$	—	$	107,637

	Nine Months Ended September 30, 2011
	(In thousands)
	WESCO International, Inc.			WESCO Distribution, Inc.			Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries		Consolidated
Net cash provided (used) by operating activities	$	(2,450	)	$	33,256		$	41,022		$	—	$	71,828
Investing activities:
Capital expenditures	—			(21,700		)	(2,266		)	—		(23,966		)
Acquisition payments	—			(8,166		)	—			—		(8,166		)
Other	—			86			—			—		86
Net cash used in investing activities	—			(29,780		)	(2,266		)	—		(32,046		)
Financing activities:
Net (repayments) borrowings	4,973			(6,002		)	—			—		(1,029		)
Equity transactions	(2,517		)	—			—			—		(2,517		)
Other	—			8,751			—			—		8,751
Net cash provided by financing activities	2,456			2,749			—			—		5,205
Effect of exchange rate changes on cash and cash equivalents	—			—			(4,515		)	—		(4,515		)
Net change in cash and cash equivalents	6			6,225			34,241			—		40,472
Cash and cash equivalents at the beginning of year	1			32,342			21,234			—		53,577
Cash and cash equivalents at the end of period	$	7		$	38,567		$	55,475		$	—	$	94,049

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ACCOUNTING POLICIES (Policies)

9 Months Ended

Sep. 30, 2012

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation

The unaudited condensed consolidated financial statements of WESCO have been prepared in accordance with Rule 10-01 of Regulation S-X of the Securities and Exchange Commission (the “SEC”). The unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in WESCO’s 2011 Annual Report on Form 10-K filed with the SEC. The December 31, 2011 condensed consolidated balance sheet data was derived from audited financial statements but does not include all disclosures required by accounting principles generally accepted in the United States.

The unaudited condensed consolidated balance sheet as of September 30, 2012, the unaudited condensed consolidated statements of income for the three and nine months ended September 30, 2012 and 2011, respectively, and the unaudited condensed consolidated statements of cash flows for the nine months ended September 30, 2012 and 2011, respectively, in the opinion of management, have been prepared on the same basis as the audited consolidated financial statements and include all adjustments necessary for the fair statement of the results of the interim periods. All adjustments reflected in the unaudited condensed consolidated financial statements are of a normal recurring nature unless indicated. Results for the interim periods presented are not necessarily indicative of the results to be expected for the full year.

Reclassification

Reclassification

Certain prior period amounts have been reclassified to conform with the current period's financial statement presentation.

Fair Value of Financial Instruments

Fair Value of Financial Instruments

The Company measures the fair value of financial assets and liabilities based on the guidance of ASC 820, "Fair Value Measurements and Disclosures," which defines fair value, establishes a framework for measuring fair value, and expands disclosures about fair value measurements.

ASC 820 establishes a fair value hierarchy, which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. ASC 820 describes three levels of inputs that may be used to measure fair value:

Level 1 inputs are quoted prices in active markets for identical assets or liabilities.

Level 2 inputs include inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices in active markets for similar assets and liabilities, quoted prices for identical or similar assets or liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of assets or liabilities.

Level 3 inputs are unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions.

At September 30, 2012, the carrying value of WESCO’s 7.50% Senior Subordinated Notes due 2017 (the "2017 Notes") and 6.0% Convertible Senior Debentures due 2029 (the "2029 Debentures") was $494.9 million and the fair value was approximately $892.9 million. At December 31, 2011, the carrying value of WESCO’s 2017 Notes and 2029 Debentures was $495.0 million and the fair value was approximately $850.9 million. The fair value of WESCO’s 2017 Notes and 2029 Debentures is based on quoted prices in active markets and is therefore classified as Level 1 within the valuation hierarchy. The reported carrying amounts of WESCO’s other debt instruments approximate their fair values and are classified as Level 2 within the valuation hierarchy. Other debt instruments included in Level 2 are valued using a market approach, utilizing interest rates and other relevant information generated by market transactions involving similar instruments.

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COMMITMENTS AND CONTINGENCIES (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Commitments and Contingencies Disclosure [Abstract]
Loss Contingency, Damages Sought, Value	$ 50

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ORGANIZATION (Details)	9 Months Ended
	Sep. 30, 2012 customers countries distribution_centers branches
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Customers (in customers)	65,000
Full service branches (in branches)	400
Distribution centers (in distribution centers)	8
Additional countries (in countries)	11

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SCHEDULE OF SHARE-BASED PAYMENT AWARD, VALUATION ASSUMPTIONS (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2012 Y	Jun. 30, 2011 Y	Sep. 30, 2012 Y	Sep. 30, 2011 Y
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk free interest rate	0.60%	1.00%	0.90%	2.30%
Expected life (in years)	5.0	5.0	5.0	5.0
WESCO expected volatility	50.00%	48.00%	50.00%	49.00%
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	850	15,156	257,932	399,330
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	2,400	0	74,724	53,852
Performance-based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	0	0	46,804	0

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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Operating Activities:
Net income	$ 175,263	$ 141,402
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	26,431	22,861
Amortization of debt issuance costs	1,898	3,838
Amortization of debt discount	2,208	1,850
Deferred income taxes	21,934	7,702
Stock-based compensation expense	11,722	12,360
Loss on sale of property, buildings and equipment	439	171
Excess tax benefit from stock-based compensation	(5,560)	(3,523)
Interest related to uncertain tax positions	(3,288)	1,581
Changes in assets and liabilities
Trade and other receivables, net	(64,017)	(154,686)
Inventories, net	(16,028)	(44,155)
Prepaid expenses and other current assets	9,129	(998)
Accounts payable	38,540	110,550
Accrued payroll and benefit costs	(15,403)	(2,686)
Other current and noncurrent liabilities	6,415	(24,439)
Net cash provided by operating activities	189,683	71,828
Investing Activities:
Capital expenditures	(19,469)	(23,966)
Acquisition payments, net of cash acquired	(201,123)	(8,166)
Proceeds from sale of assets	51	86
Net cash used in investing activities	(220,541)	(32,046)
Financing Activities:
Proceeds from issuance of short-term debt	21,388	0
Repayments of short-term debt	(2,129)	0
Proceeds from issuance of long-term debt	740,450	464,981
Repayments of long-term debt	(691,202)	(464,900)
Debt issuance costs	(137)	(4,248)
Proceeds from the exercise of stock options	208	210
Excess tax benefit from stock-based compensation	5,560	3,523
Repurchase of common stock	(8,237)	(6,250)
(Decrease) increase in bank overdrafts	10,192	12,999
Payments on capital lease obligations	(1,702)	(1,110)
Net cash (used in) provided by financing activities	74,391	5,205
Effect of exchange rate on cash and cash equivalents	235	(4,515)
Net change in cash and cash equivalents	43,768	40,472
Cash and cash equivalents at the beginning of the period	63,869	53,577
Cash and cash equivalents at the end of the period	107,637
Non-cash investing and financing activities:
Property, buildings and equipment acquired through capital leases	2,693	210
Issuance of treasury stock	$ 0	$ 960

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EARNINGS PER SHARE

9 Months Ended

Sep. 30, 2012

Earnings Per Share [Abstract]

EARNINGS PER SHARE

EARNINGS PER SHARE

Basic earnings per share are computed by dividing net income by the weighted average common shares outstanding during the periods. Diluted earnings per share are computed by dividing net income by the weighted average common shares and common share equivalents outstanding during the periods. The dilutive effect of common share equivalents is considered in the diluted earnings per share computation using the treasury stock method, which includes consideration of stock-based compensation and convertible debt.

The following table sets forth the details of basic and diluted earnings per share:

	Three Months Ended
	September 30,
	2012		2011
Net income attributable to WESCO International, Inc.	$	63,415	$	53,890
Weighted average common shares outstanding used in computing basic earnings per share	43,705		43,289
Common shares issuable upon exercise of dilutive equity awards	1,032		976
Common shares issuable from contingently convertible debentures (see below for basis of calculation)	6,036		4,206
Weighted average common shares outstanding and common share equivalents used in computing diluted earnings per share	50,773		48,471
Earnings per share attributable to WESCO International, Inc.
Basic	$	1.45	$	1.24
Diluted	$	1.25	$	1.11

	Nine Months Ended
	September 30,
	2012		2011
Net income attributable to WESCO International, Inc.	$	175,267	$	141,402
Weighted average common shares outstanding used in computing basic earnings per share	43,596		43,181
Common shares issuable upon exercise of dilutive equity awards	1,199		1,202
Common shares issuable from contingently convertible debentures (see below for basis of calculation)	6,262		5,400
Weighted average common shares outstanding and common share equivalents used in computing diluted earnings per share	51,057		49,783
Earnings per share attributable to WESCO International, Inc.
Basic	$	4.02	$	3.27
Diluted	$	3.43	$	2.84

For the three and nine months ended September 30, 2012, the computation of diluted earnings per share attributable to WESCO International, Inc. excluded 1.0 million and 1.2 million, respectively, of stock-settled stock appreciation rights at weighted average exercise prices of $64 per share and $62 per share, respectively. These amounts were excluded because their effect would have been antidilutive.

Because of WESCO’s obligation to settle the par value of the 6.0% Convertible Senior Debentures due 2029 (the “2029 Debentures”) and the previously outstanding 1.75% Convertible Senior Debentures due 2026 (the “2026 Debentures” and together with the 2029 Debentures, the “Debentures”) in cash upon conversion, WESCO is not required to include any shares underlying the Debentures in its diluted weighted average shares outstanding until the average stock price per share for the period exceeds the conversion price of the respective Debentures. At such time, only the number of shares that would be issuable (under the treasury stock method of accounting for share dilution) would be included, which is based upon the amount by which the average stock price exceeds the conversion price. The conversion price of the 2029 Debentures is $28.87. Share dilution is limited to a maximum of 11,949,513 shares for the 2029 Debentures. For the three and nine months ended September 30, 2012, the effect of the Debentures on diluted earnings per share attributable to WESCO International, Inc. was a decrease of $0.17 and $0.48, respectively. For the three and nine months ended September 30, 2011, the effect of the Debentures on diluted earnings per share attributable to WESCO International, Inc. was a decrease of $0.11 and $0.35, respectively.

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SUMMARY OF RESTRICTED STOCK UNITS (Details) (Restricted Stock Units (RSUs) [Member], USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Jun. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Unvested (in shares)	191,026		191,026		203,291
Granted (in shares)	2,400	0	74,724	53,852
Vested (in shares)			(78,305)
Forfeited (in shares)			(8,684)
Unvested, Weighted Average Fair Value (in dollars per share)	$ 52.24		$ 52.24		$ 37.16
Granted, Weighted Average Fair Value (in dollars per share)	$ 62.49		$ 64.27	$ 60.05
Vested in Period, Weighted Average Fair Value (in dollars per share)			$ 25.37
Forfeited in Period, Weighted Average Fair Value (in dollars per share)	$ 45.02		$ 45.02

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CONDENSED CONSOLIDATED INCOME STATEMENTS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Jun. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Condensed Financial Information [Line Items]
Net sales	$ 1,656,186	$ 1,580,376	$ 4,934,938	$ 4,536,196
Cost of goods sold	1,317,432	1,264,745	3,940,762	3,627,666
Selling, general and administrative expense	225,812	216,205	685,130	644,176
Depreciation and amortization	9,910	7,674	26,431	22,861
Results of affiliates' operations	0	0	0	0
Interest expense, net	12,654	15,079	33,093	41,651
Provision for income taxes	26,987	22,783	74,259	58,440
Net income	63,391	53,890	175,263	141,402
Net income attributable to noncontrolling interest	(24)	0	(4)	0
Net income attributable to WESCO International, Inc.	63,415	53,890	175,267	141,402
Comprehensive Income:
Foreign currency translation adjustment	10,652	(26,411)	14,297	(16,685)
Comprehensive income attributable to WESCO International, Inc.	74,067	27,479	189,564	124,717
Parent Company [Member]
Condensed Financial Information [Line Items]
Net sales	0	0	0	0
Cost of goods sold	0	0	0	0
Selling, general and administrative expense	25	18	49	62
Depreciation and amortization	0	0	0	0
Results of affiliates' operations	69,571	60,336	192,729	159,957
Interest expense, net	6,095	6,428	17,417	18,493
Provision for income taxes	0	0	0	0
Net income	63,451		175,263
Net income attributable to noncontrolling interest	0		0
Net income attributable to WESCO International, Inc.	63,451	53,890	175,263	141,402
Comprehensive Income:
Foreign currency translation adjustment	10,652	(26,411)	14,297	(16,685)
Comprehensive income attributable to WESCO International, Inc.	74,103	27,479	189,560	124,717
Guarantor Subsidiaries [Member]
Condensed Financial Information [Line Items]
Net sales	868,289	847,745	2,602,688	2,386,968
Cost of goods sold	689,522	680,897	2,074,165	1,913,902
Selling, general and administrative expense	121,006	134,671	413,540	404,112
Depreciation and amortization	3,980	2,780	11,231	8,228
Results of affiliates' operations	44,115	53,846	164,338	156,191
Interest expense, net	3,706	5,573	7,667	12,839
Provision for income taxes	24,679	17,334	67,694	44,121
Net income	69,511		192,729
Net income attributable to noncontrolling interest	0		0
Net income attributable to WESCO International, Inc.	69,511	60,336	192,729	159,957
Comprehensive Income:
Foreign currency translation adjustment	10,652	(26,411)	14,297	(16,685)
Comprehensive income attributable to WESCO International, Inc.	80,163	33,925	207,026	143,272
Non-Guarantor Subsidiaries [Member]
Condensed Financial Information [Line Items]
Net sales	816,211	764,880	2,432,239	2,223,588
Cost of goods sold	656,224	616,097	1,966,586	1,788,124
Selling, general and administrative expense	104,781	81,516	271,541	240,002
Depreciation and amortization	5,930	4,894	15,200	14,633
Results of affiliates' operations	0	0	0	0
Interest expense, net	2,853	3,078	8,009	10,319
Provision for income taxes	2,308	5,449	6,565	14,319
Net income	44,115		164,338
Net income attributable to noncontrolling interest	(24)		(4)
Net income attributable to WESCO International, Inc.	44,139	53,846	164,342	156,191
Comprehensive Income:
Foreign currency translation adjustment	10,652	(26,411)	14,297	(16,685)
Comprehensive income attributable to WESCO International, Inc.	54,791	27,435	178,639	139,506
Consolidation, Eliminations [Member]
Condensed Financial Information [Line Items]
Net sales	(28,314)	(32,249)	(99,989)	(74,360)
Cost of goods sold	(28,314)	(32,249)	(99,989)	(74,360)
Selling, general and administrative expense	0	0	0	0
Depreciation and amortization	0	0	0	0
Results of affiliates' operations	(113,686)	(114,182)	(357,067)	(316,148)
Interest expense, net	0	0	0	0
Provision for income taxes	0	0	0	0
Net income	(113,686)		(357,067)
Net income attributable to noncontrolling interest	0		0
Net income attributable to WESCO International, Inc.	(113,686)	(114,182)	(357,067)	(316,148)
Comprehensive Income:
Foreign currency translation adjustment	(21,304)	52,822	(28,594)	33,370
Comprehensive income attributable to WESCO International, Inc.	$ (134,990)	$ (61,360)	$ (385,661)	$ (282,778)

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OTHER FINANCIAL INFORMATION (Tables)

9 Months Ended

Sep. 30, 2012

Condensed Financial Information [Abstract]

Condensed Financial Information Statements Of Financial Condition [Text Block]

	September 30, 2012
	(In thousands)
	WESCO International, Inc.		WESCO Distribution, Inc.		Non-Guarantor Subsidiaries		Consolidating and Eliminating Entries			Consolidated
Cash and cash equivalents	$	3	$	75,673	$	31,961	$	—		$	107,637
Trade accounts receivable, net	—		—		1,020,454		—			1,020,454
Inventories, net	—		337,316		325,448		—			662,764
Other current assets	—		38,423		76,647		—			115,070
Total current assets	3		451,412		1,454,510		—			1,905,925
Intercompany receivables, net	—		—		1,751,125		(1,751,125		)	—
Property, buildings and equipment, net	—		59,543		81,455		—			140,998
Intangible assets, net	—		6,360		198,212		—			204,572
Goodwill and other intangibles, net	—		246,125		880,876		—			1,127,001
Investments in affiliates and other noncurrent assets	2,426,032		3,601,264		30,989		(6,016,787		)	41,498
Total assets	$	2,426,035	$	4,364,704	$	4,397,167	$	(7,767,912	)	$	3,419,994
Accounts payable	$	—	$	444,291	$	248,886	$	—		$	693,177
Other current liabilities	2,578		57,161		157,120		—			216,859
Total current liabilities	2,578		501,452		406,006		—			910,036
Intercompany payables, net	679,405		1,071,720		—		(1,751,125		)	—
Long-term debt	171,244		187,988		337,526		—			696,758
Other noncurrent liabilities	28,126		182,443		58,101		—			268,670
Stockholders’ equity	1,544,682		2,421,101		3,595,534		(6,016,787		)	1,544,530
Total liabilities and stockholders’ equity	$	2,426,035	$	4,364,704	$	4,397,167	$	(7,767,912	)	$	3,419,994

	December 31, 2011
	(In thousands)
	WESCO International, Inc.		WESCO Distribution, Inc.		Non-Guarantor Subsidiaries		Consolidating and Eliminating Entries			Consolidated
Cash and cash equivalents	$	5	$	44,412	$	19,452	$	—		$	63,869
Trade accounts receivable, net	—		—		939,422		—			939,422
Inventories, net	—		341,423		285,544		—			626,967
Other current assets	270		32,548		74,344		—			107,162
Total current assets	275		418,383		1,318,762		—			1,737,420
Intercompany receivables, net	—		—		1,771,921		(1,771,921		)	—
Property, buildings and equipment, net	—		54,038		79,512		—			133,550
Intangible assets, net	—		6,981		149,893		—			156,874
Goodwill and other intangibles, net	—		246,125		762,002		—			1,008,127
Investments in affiliates and other noncurrent assets	2,219,323		3,422,885		31,745		(5,631,472		)	42,481
Total assets	$	2,219,598	$	4,148,412	$	4,113,835	$	(7,403,393	)	$	3,078,452
Accounts payable	$	—	$	423,509	$	219,268	$	—		$	642,777
Other current liabilities	7,797		56,035		139,237		—			203,069
Total current liabilities	7,797		479,544		358,505		—			845,846
Intercompany payables, net	668,447		1,103,474		—		(1,771,921		)	—
Long-term debt	169,054		188,081		285,787		—			642,922
Other noncurrent liabilities	28,131		163,177		52,466		—			243,774
Stockholders’ equity	1,346,169		2,214,136		3,417,077		(5,631,472		)	1,345,910
Total liabilities and stockholders’ equity	$	2,219,598	$	4,148,412	$	4,113,835	$	(7,403,393	)	$	3,078,452

Condensed Financial Information Statement Of Income [Text Block]

	Three Months Ended September 30, 2012
	(In thousands)
	WESCO International, Inc.		WESCO Distribution, Inc.		Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net sales	$	—	$	868,289	$	816,211		$	(28,314	)	$	1,656,186
Cost of goods sold	—		689,522		656,224			(28,314		)	1,317,432
Selling, general and administrative expenses	25		121,006		104,781			—			225,812
Depreciation and amortization	—		3,980		5,930			—			9,910
Results of affiliates’ operations	69,571		44,115		—			(113,686		)	—
Interest expense, net	6,095		3,706		2,853			—			12,654
Provision for income taxes	—		24,679		2,308			—			26,987
Net income (loss)	63,451		69,511		44,115			(113,686		)	63,391
Less: Net loss attributable to noncontrolling interest	—		—		(24		)	—			(24		)
Net income (loss) attributable to WESCO International, Inc.	$	63,451	$	69,511	$	44,139		$	(113,686	)	$	63,415
Comprehensive income:
Foreign currency translation adjustment	10,652		10,652		10,652			(21,304		)	10,652
Comprehensive income attributable to WESCO International, Inc.	$	74,103	$	80,163	$	54,791		$	(134,990	)	$	74,067

	Three Months Ended September 30, 2011
	(In thousands)
	WESCO International, Inc.			WESCO Distribution, Inc.			Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net sales	$	—		$	847,745		$	764,880		$	(32,249	)	$	1,580,376
Cost of goods sold	—			680,897			616,097			(32,249		)	1,264,745
Selling, general and administrative expenses	18			134,671			81,516			—			216,205
Depreciation and amortization	—			2,780			4,894			—			7,674
Results of affiliates’ operations	60,336			53,846			—			(114,182		)	—
Interest expense, net	6,428			5,573			3,078			—			15,079
Provision for income taxes	—			17,334			5,449			—			22,783
Net income (loss) attributable to WESCO International, Inc.	$	53,890		$	60,336		$	53,846		$	(114,182	)	$	53,890
Comprehensive income:
Foreign currency translation adjustment	(26,411		)	(26,411		)	(26,411		)	52,822			(26,411		)
Comprehensive income attributable to WESCO International, Inc.	$	27,479		$	33,925		$	27,435		$	(61,360	)	$	27,479

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF INCOME AND COMPREHENSIVE INCOME

(unaudited)

	Nine Months Ended September 30, 2012
	(In thousands)
	WESCO International, Inc.		WESCO Distribution, Inc.		Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net sales	$	—	$	2,602,688	$	2,432,239		$	(99,989	)	$	4,934,938
Cost of goods sold	—		2,074,165		1,966,586			(99,989		)	3,940,762
Selling, general and administrative expenses	49		413,540		271,541			—			685,130
Depreciation and amortization	—		11,231		15,200			—			26,431
Results of affiliates’ operations	192,729		164,338		—			(357,067		)	—
Interest expense, net	17,417		7,667		8,009			—			33,093
Provision for income taxes	—		67,694		6,565			—			74,259
Net income (loss)	175,263		192,729		164,338			(357,067		)	175,263
Less: Net loss attributable to noncontrolling interest	—		—		(4		)	—			(4		)
Net income (loss) attributable to WESCO International, Inc.	$	175,263	$	192,729	$	164,342		$	(357,067	)	$	175,267
Comprehensive income:
Foreign currency translation adjustment	14,297		14,297		14,297			(28,594		)	14,297
Comprehensive income attributable to WESCO International, Inc.	$	189,560	$	207,026	$	178,639		$	(385,661	)	$	189,564

	Nine Months Ended September 30, 2011
	(In thousands)
	WESCO International, Inc.			WESCO Distribution, Inc.			Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net sales	$	—		$	2,386,968		$	2,223,588		$	(74,360	)	$	4,536,196
Cost of goods sold	—			1,913,902			1,788,124			(74,360		)	3,627,666
Selling, general and administrative expenses	62			404,112			240,002			—			644,176
Depreciation and amortization	—			8,228			14,633			—			22,861
Results of affiliates’ operations	159,957			156,191			—			(316,148		)	—
Interest expense, net	18,493			12,839			10,319			—			41,651
Provision for income taxes	—			44,121			14,319			—			58,440
Net income (loss) attributable to WESCO International, Inc.	$	141,402		$	159,957		$	156,191		$	(316,148	)	$	141,402
Comprehensive income:
Foreign currency translation adjustment	(16,685		)	(16,685		)	(16,685		)	33,370			(16,685		)
Comprehensive income attributable to WESCO International, Inc.	$	124,717		$	143,272		$	139,506		$	(282,778	)	$	124,717

Condensed Financial Information Statements Of Cash Flows [Text Block]

	Nine Months Ended September 30, 2012
	(In thousands)
	WESCO International, Inc.			WESCO Distribution, Inc.			Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries		Consolidated
Net cash (used) provided by operating activities	$	(8,490	)	$	201,343		$	(3,170	)	$	—	$	189,683
Investing activities:
Capital expenditures	—			(15,654		)	(3,815		)	—		(19,469		)
Acquisition payments	—			(201,123		)	—			—		(201,123		)
Other	—			51			—			—		51
Net cash used in investing activities	—			(216,726		)	(3,815		)	—		(220,541		)
Financing activities:
Net borrowings	10,957			36,589			19,259			—		66,805
Equity transactions	(2,469		)	—			—			—		(2,469		)
Other	—			10,055			—			—		10,055
Net cash provided by financing activities	8,488			46,644			19,259			—		74,391
Effect of exchange rate changes on cash and cash equivalents	—			—			235			—		235
Net change in cash and cash equivalents	(2.4		)	31,261			12,509			—		43,768
Cash and cash equivalents at the beginning of year	5			44,412			19,452			—		63,869
Cash and cash equivalents at the end of period	$	3		$	75,673		$	31,961		$	—	$	107,637

	Nine Months Ended September 30, 2011
	(In thousands)
	WESCO International, Inc.			WESCO Distribution, Inc.			Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries		Consolidated
Net cash provided (used) by operating activities	$	(2,450	)	$	33,256		$	41,022		$	—	$	71,828
Investing activities:
Capital expenditures	—			(21,700		)	(2,266		)	—		(23,966		)
Acquisition payments	—			(8,166		)	—			—		(8,166		)
Other	—			86			—			—		86
Net cash used in investing activities	—			(29,780		)	(2,266		)	—		(32,046		)
Financing activities:
Net (repayments) borrowings	4,973			(6,002		)	—			—		(1,029		)
Equity transactions	(2,517		)	—			—			—		(2,517		)
Other	—			8,751			—			—		8,751
Net cash provided by financing activities	2,456			2,749			—			—		5,205
Effect of exchange rate changes on cash and cash equivalents	—			—			(4,515		)	—		(4,515		)
Net change in cash and cash equivalents	6			6,225			34,241			—		40,472
Cash and cash equivalents at the beginning of year	1			32,342			21,234			—		53,577
Cash and cash equivalents at the end of period	$	7		$	38,567		$	55,475		$	—	$	94,049