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