10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended March 31, 2014

OR

o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Commission file number: 000-20540

ON ASSIGNMENT, INC.

(Exact name of registrant as specified in its charter)

Delaware	95-4023433
(State of Incorporation)	(I.R.S. Employer Identification No.)
26745 Malibu Hills Road, Calabasas, CA	91301
(Address of principal executive offices)	(Zip Code)
(818) 878-7900
(Registrant’s telephone number, including area code)

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 the past 90 days. xYes o No 

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).  xYes o No 

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.

Large accelerated filer x	Accelerated filer o
Non-accelerated filer o	Smaller reporting company o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

o Yes x No 

At May 2, 2014, the total number of outstanding shares of the Company’s Common Stock ($0.01 par value) was 54,327,203.

ON ASSIGNMENT, INC. AND SUBSIDIARIES

Index

PART I – FINANCIAL INFORMATION
Item 1 – Condensed Consolidated Financial Statements (unaudited)	3
Condensed Consolidated Balance Sheets as of March 31, 2014 and December 31, 2013	3
Condensed Consolidated Statements of Operations and Comprehensive Income for the Three Months Ended March 31, 2014 and 2013	4
Condensed Consolidated Statements of Cash Flows for the Three Months Ended March 31, 2014 and 2013	5
Notes to Condensed Consolidated Financial Statements	6
Item 2 – Management’s Discussion and Analysis of Financial Condition and Results of Operations	14
Item 3 – Quantitative and Qualitative Disclosures about Market Risks	18
Item 4 – Controls and Procedures	18
PART II – OTHER INFORMATION
Item 1 – Legal Proceedings	19
Item 1A – Risk Factors	19
Item 6 – Exhibits	20
Signature	21

2

PART I - FINANCIAL INFORMATION

Item 1 — Condensed Consolidated Financial Statements (Unaudited)

ON ASSIGNMENT, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED)

(Dollars in thousands, except share amounts)

	March 31, 2014		December 31,  2013
ASSETS
Current Assets:
Cash and cash equivalents	$	23,394	$	37,350
Accounts receivable, net of allowance of $4,557 and $3,067, respectively	277,553		262,224
Prepaid expenses	6,383		8,686
Deferred income tax assets	17,205		17,214
Workers' compensation and medical malpractice receivable	20,041		21,200
Other	3,055		3,200
Total current assets	347,631		349,874
Property and equipment, net	40,193		38,591
Goodwill	575,225		574,948
Identifiable intangible assets, net	282,282		288,455
Other	9,073		9,326
Total Assets	$	1,254,404	$	1,261,194
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current Liabilities:
Current portion of long-term debt	$	18,250	$	10,000
Accounts payable	5,687		8,370
Accrued payroll and contract professional pay	77,377		76,556
Workers’ compensation and medical malpractice loss reserves	31,808		32,751
Income taxes payable	978		13,418
Other	23,068		27,926
Total current liabilities	157,168		169,021
Deferred income tax liabilities	49,559		49,584
Long-term debt	375,563		389,813
Other long-term liabilities	11,600		12,643
Total liabilities	593,890		621,061
Commitments and Contingencies
Stockholders’ Equity:
Preferred Stock, $0.01 par value, 1,000,000 shares authorized, no shares issued	—		—
Common Stock, $0.01 par value, 75,000,000 shares authorized, 54,318,986 and 53,926,525 issued and outstanding, respectively	543		539
Paid-in capital	499,739		493,279
Retained earnings	160,116		146,199
Accumulated other comprehensive income	116		116
Total stockholders’ equity	660,514		640,133
Total Liabilities and Stockholders’ Equity	$	1,254,404	$	1,261,194

See Notes to Condensed Consolidated Financial Statements.

3

ON ASSIGNMENT, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (UNAUDITED)

(In thousands, except per share amounts)

	Three Months Ended
	March 31,
	2014			2013
Revenues	$	439,274		$	379,044
Cost of services	301,686			268,933
Gross profit	137,588			110,111
Selling, general and administrative expenses	104,134			81,877
Amortization of intangible assets	6,172			5,379
Operating income	27,282			22,855
Interest expense, net	(3,328		)	(5,096		)
Income before income taxes	23,954			17,759
Provision for income taxes	9,906			7,543
Income from continuing operations	14,048			10,216
Gain on sale of discontinued operations, net of income taxes	—			14,412
Loss from discontinued operations, net of income taxes	(131		)	(15		)
Net income	$	13,917		$	24,613
Basic earnings per common share:
Income from continuing operations	$	0.26		$	0.19
Income (loss) from discontinued operations	—			0.27
Net Income	$	0.26		$	0.46
Diluted earnings per common share:
Income from continuing operations	$	0.26		$	0.19
Income (loss) from discontinued operations	(0.01		)	0.27
Net Income	$	0.25		$	0.46
Number of shares and share equivalents used to calculate earnings per share:
Basic	54,104			53,046
Diluted	54,975			54,036
Reconciliation of net income to comprehensive income:
Net income	$	13,917		$	24,613
Changes in fair value of derivatives, net of tax of $9 and $28, respectively.	44			67
Foreign currency translation adjustment, net of tax	(44		)	(1,259		)
Comprehensive income	$	13,917		$	23,421

 See Notes to Condensed Consolidated Financial Statements.

4

ON ASSIGNMENT, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED)

(In thousands)

	Three Months Ended
	March 31,
	2014			2013
Cash Flows from Operating Activities:
Net income	$	13,917		$	24,613
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Gain on sale of discontinued operations, net of income taxes	—			(14,412		)
Depreciation and amortization	8,959			7,244
Stock-based compensation	3,190			2,724
Gross excess tax benefits from stock-based compensation	(2,088		)	(768		)
Workers’ compensation and medical malpractice provision	1,592			1,288
Other	2,029			502
Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
Accounts receivable	(16,476		)	(26,113		)
Prepaid expenses and income taxes	3,950			2,151
Accounts payable	(3,006		)	(1,089		)
Accrued payroll and contract professional pay	599			7,203
Income taxes payable	(12,445		)	2,431
Deferred compensation	(20		)	(4,850		)
Other	(4,522		)	2,651
Net cash provided by (used in) operating activities	(4,321		)	3,575
Cash Flows from Investing Activities:
Cash paid for property and equipment	(4,020		)	(2,785		)
Cash received from sale of discontinued operations, net	—			28,893
Cash paid for acquisitions, net of cash acquired	(222		)	—
Other	352			(1,689		)
Net cash provided by (used in) investing activities	(3,890		)	24,419
Cash Flows from Financing Activities:
Principal payments of long-term debt	(105,500		)	(43,000		)
Proceeds from term debt	99,500			—
Proceeds from stock transactions	2,967			2,443
Payments of employment taxes related to release of restricted stock awards	(3,277		)	(3,611		)
Gross excess tax benefits from stock-based compensation	2,088			768
Other	(1,137		)	(20		)
Net cash used in financing activities	(5,359		)	(43,420		)
Effect of exchange rate changes on cash and cash equivalents	(386		)	(279)
Net Decrease in Cash and Cash Equivalents	(13,956		)	(15,705		)
Cash and Cash Equivalents at Beginning of Year	37,350			27,479
Cash and Cash Equivalents at End of Period	$	23,394		$	11,774
Supplemental Disclosure of Cash Flow Information:
Cash paid for:
Income taxes	$	21,034		$	3,861
Interest	$	3,087		$	4,673
Supplemental Disclosure of Non-Cash Transactions:
Acquisition of property and equipment through accounts payable	$	870		$	819

 See Notes to Condensed Consolidated Financial Statements.

5

ON ASSIGNMENT, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

1.Financial Statement Presentation. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America for interim financial information, the instructions to Form 10-Q and Regulation S-X. Accordingly, they do not include all of the information and footnotes required by accounting principles generally accepted in the United States of America for complete financial statements. The financial statements include adjustments consisting of normal recurring items, which, in the opinion of management, are necessary for a fair presentation of the financial position of On Assignment, Inc. and its subsidiaries (the "Company") and its results of operations for the interim dates and periods set forth herein. The results for the three months endedMarch 31, 2014 are not necessarily indicative of the results to be expected for the full year or any other period. This Quarterly Report on Form 10-Q should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2013.

2.Accounting Standards Update.In April 2014, the Financial Accounting Standards Board issued Accounting Standards Update No. 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity ("ASU 2014-08"). ASU 2014-08 amends the definition of a discontinued operation and requires entities to provide additional disclosures for both discontinued operations and disposal transactions that do not meet the discontinued-operations criteria. It is effective for annual periods beginning on or after December 15, 2014. The Company does not expect the adoption of this guidance to have a material effect on its consolidated financial statements.

3.Acquisitions. On December 5, 2013, the Company acquired all of the outstanding shares of CyberCoders Holdings, Inc. ("CyberCoders"), a provider of permanent placement services headquartered in Irvine, California. The primary reason for the acquisition was to expand the Company's permanent placement services. The purchase price was $98.6 million, comprised of $93.6 million in cash paid at closing and estimated future contingent consideration of $5.0 million, which is based on estimated financial performance of CyberCoders through 2015 (the maximum contingent consideration opportunity is $11.0 million). Acquisition costs of approximately $1.5 million were expensed in 2013. Goodwill deductible for tax purposes is $10.3 million for this transaction. The results of operations for the acquisition have been combined with those of the Company from the acquisition date.

On December 2, 2013, the Company acquired all of the outstanding membership interests of Whitaker Medical, LLC ("Whitaker"), a provider of physician staffing services headquartered in Houston, Texas. The primary reason for the acquisition was to expand the Company's Physician staffing services. The purchase price was $21.3 million, comprised of $18.5 million in cash paid at closing and estimated future contingent consideration of $2.8 million, which is based on estimated financial performance of Whitaker through 2015 (the maximum contingent consideration opportunity is $5.0 million). Acquisition costs of approximately $0.4 million were expensed in 2013. Goodwill of $7.5 million is deductible for tax purposes. The results of operations for the acquisition have been combined with those of the Company from the acquisition date.

Assets and liabilities of the acquired companies were recorded at their estimated fair values at the date of acquisition. The excess purchase price over the fair value of net tangible assets and identifiable intangible assets acquired has been allocated to goodwill. The fair value assigned to identifiable intangible assets was determined primarily by using a discounted cash flow method.

The Company's allocation of the purchase prices relating to the CyberCoders and Whitaker acquisitions remains incomplete with respect to opening net assets, intangible assets, taxes and contingent consideration. Material measurement period adjustments resulting from the finalization of the purchase price allocation will be recorded retrospectively to the acquisition date. The preliminary fair value of contingent consideration is based on the present value of the expected future payments to be made to the sellers of the acquired businesses in accordance with the respective purchase agreements. There are numerous inputs for this valuation, which the Company will finalize during the measurement period. Significant changes are likely and will change the contingent consideration and the amount allocated to goodwill. See Note 6 Fair Value Measurements for further information regarding the fair value of contingent consideration and the level 3 rollforward disclosure.

During the quarter ended March 31, 2014, the Company adjusted CyberCoder's purchase price allocation. The adjustment related to a net working capital adjustment, which was not material and had no impact on the consolidated statements of operations, and accordingly it was not presented retrospectively.

6

The following table summarizes (in thousands) the purchase price allocations for the acquisitions of CyberCoders and Whitaker, which are subject to finalization during the measurement period:

	2013 Acquisitions
	CyberCoders		Whitaker
Current assets	$	10,583	$	8,909
Property and equipment	3,790		272
Goodwill	70,784		7,452
Identifiable intangible assets	36,450		9,760
Other	915		568
Total assets acquired	$	122,522	$	26,961
Current liabilities	$	8,057	$	5,083
Other	15,817		551
Total liabilities assumed	23,874		5,634
Total purchase price	$	98,648	$	21,327

The following table summarizes (in thousands) the allocation of the purchase price among the identifiable intangible assets for the acquisitions of CyberCoders and Whitaker, which are subject to finalization during the measurement period:

		Identifiable Intangible Asset Value
	Useful life	CyberCoders		Whitaker
Contractor relationships	2.5 years	$	3,900	$	1,800
Customer relationships	3 – 7 years	750		5,900
Non-compete agreements	3 years	800		60
In-use software	6 years	18,900		—
Trademarks	indefinite	12,100		2,000
Total identifiable intangible assets acquired		$	36,450	$	9,760

The summary below (in thousands, except for per share data) presents unaudited pro forma consolidated results of operations for thethree months endedMarch 31,2013as if the acquisitions of Whitaker and CyberCoders occurred on January 1, 2012.The pro forma financial information gives effect to certain adjustments, including: amortization of intangible assets, interest expense on acquisition-related debt and provision for income taxes. Acquisition-related costs are assumed to have occurred at the beginning of the year prior to acquisition. The pro forma financial information is not necessarily indicative of the operating results that would have occurred if the acquisition had been consummated as of the date indicated, nor are they necessarily indicative of future operating results.

Revenues	$	400,022
Income from continuing operations	$	11,032
Net income	$	25,429
Basic earnings per share:
Income from continuing operations	$	0.21
Net income	$	0.48
Diluted earnings per share:
Income from continuing operations	$	0.20
Net income	$	0.47
Weighted average number of shares outstanding	53,046
Weighted average number of shares and dilutive shares outstanding	54,036

4. Discontinued Operations. On December 2, 2013, the Company completed the sale of its Allied Healthcare division for $28.7 million in cash and recognized a gain of $16.4 million, net of income taxes of $10.4 million. The Allied Healthcare division, previously included in the Healthcare segment, has been presented as discontinued operations in the Condensed Consolidated Statements of Operations for all periods presented.

7

On February 12, 2013, the Company completed the sale of the Nurse Travel division for $33.7 million in cash and recognized a gain of $14.4 million, net of income taxes of $9.1 million. The Nurse Travel division, previously included in the Healthcare segment, has been presented as discontinued operations in the Condensed Consolidated Statements of Operations for all periods presented.

The following is a summary of Allied Healthcare's and Nurse Travel's combined operating results for the three months ended March 31, 2014 and March 31, 2013, respectively (in thousands):

	2014			2013
Revenues	$	—		$	16,581
Income (loss) before income taxes	$	(209	)	$	131
Provision (benefit) for income taxes	$	(78	)	$	146
Net loss	$	(131	)	$	(15	)

5.Long-Term Debt.Long-term debt consisted of the following at March 31, 2014 and December 31, 2013(in thousands):

	2014		2013
Senior Secured Debt
Revolving credit facility, due May 2018	$	41,000	$	44,500
Term A loan facility, due May 2018	172,500		92,500
Term B loan facility, due May 2020	180,313		262,813
	$	393,813	$	399,813

On May 16, 2013, the Company entered into a new $500.0 million credit facility and repaid all borrowing under the old facility. The facility initially consisted of (i) a $100.0 million, five-year term A loan facility, (ii) a $275.0 million seven-year term B loan facility and (iii) a $125.0 million, five-year revolving loan facility. On February 28, 2014, the Company increased the term A loan facility by $82.5 million and repaid $82.5 million on the term B loan facility. Under terms of the credit facility, the Company has the ability to increase the loan facilities by up to $100.0 million under certain specified conditions.

Borrowings under the facility bear interest at the Company's option, at either the Eurodollar rate (LIBOR) or the base rate, plus 1.75 percent to 2.50 percent for the term A loan facility and revolving loans and LIBOR, with a floor of 1.0 percent, plus 2.50 percent for the term B loan facility. The commitment fee on the undrawn portion available under the revolving loan facility ranges from 0.25 percent to 0.40 percent.

At March 31, 2014, borrowings on the term A loan facility bore interest at 2.2 percent, and borrowings on the term B loan facility bore interest at 3.5 percent. The revolving credit facility bore interest at 2.2 percent. The weighted average interest rate at March 31, 2014 was 2.8 percent.

During the remainder of this fiscal year, each of the next four years and thereafter, the Company will be required to make payments as follows (in thousands):

2014	$	13,687
2015	18,250
2016	18,250
2017	18,250
2018	145,063
Thereafter	180,313
	$	393,813

The Company is also required to make mandatory prepayments of loans under the facility, subject to specified exceptions, from excess cash flow and the proceeds of asset sales, debt issuances and specified other events.

The Company's obligations under the credit facility are guaranteed by substantially all of its direct and indirect domestic subsidiaries and secured by a lien on substantially all of the Company's tangible and intangible property and by a pledge of: (i) all of the equity interests in its direct and indirect domestic subsidiaries; and (ii) approximately 65 percent of the equity interests in its first-tier foreign subsidiaries.

In addition to other covenants, the maximum ratio of consolidated funded debt to consolidated EBITDA steps down from 4.00:1.00 as of March 31, 2014 to 3.25:1.00 by June 30, 2015. There are also limits on the Company's and its subsidiaries' ability to: incur liens, incur

8

additional indebtedness, make loans and investments, engage in mergers and acquisitions, engage in asset sales, declare dividends or redeem or repurchase capital stock, alter the business conducted by the Company and its subsidiaries, transact with affiliates, prepay, redeem or purchase subordinated debt and amend or otherwise alter debt agreements.

As of March 31, 2014 and December 31, 2013, the Company was in compliance with all of its debt covenants. As of March 31, 2014, the Company had a ratio of funded debt to consolidated EBITDA of 2.12:1.00 and had $81.0 million of borrowings available under the revolving credit facility.

6.Fair Value Measurements. The recorded values of cash and cash equivalents, accounts receivable, accounts payable and accrued expenses approximate their fair value based on their short-term nature. Long-term debt recorded in the Company’s Condensed Consolidated Balance Sheet atMarch 31, 2014was$393.8 million. The fair value of the long-term debt, determined using the quoted price technique based on Level 2 inputs including the yields of comparable companies with similar credit characteristics, was $393.3 million.

The Company has obligations, to be paid in cash, to the former owners of CyberCoders and Whitaker, if certain future financial goals are met. The fair value of this contingent consideration is determined using an expected present value technique. Expected cash flows are determined using the probability - weighted average of possible outcomes that would occur should certain financial metrics be reached. There is no market data available to use in valuing the contingent consideration, therefore, the Company developed its own assumptions related to the future financial performance of the businesses to evaluate the fair value of these liabilities. As such, the contingent consideration is classified within Level 3.

In connection with estimating the fair value of the contingent consideration, the Company develops various scenarios (base case, downside case, and upside case) and weights each according to the probability of occurrence. The probabilities range from 10.0 percent to 60.0 percent, with the most significant weighting given to the base case at 60 percent for Whitaker and 50 percent for CyberCoders. These scenarios are developed based on the expected financial performance of the acquired companies, with revenue growth rates being a primary input to the calculation. These revenue growth rates range from 2.0 percent to 15.0 percent for Whitaker, and from 9.6 percent to 25.0 percent for CyberCoders. An increase or decrease in the probability of achievement of any of these scenarios could result in a significant increase or decrease to the estimated fair value.

The fair value is reviewed on a quarterly basis based on the most recent financial performance of the most recent fiscal quarter. An analysis is performed at the end of each fiscal quarter to compare actual results to forecasted financial performance. If performance has deviated from projected levels, the valuation is updated for the latest information available.

The significant assumptions that may materially affect the fair value are developed in conjunction with the guidance of subsidiary management to ensure that the most accurate and latest financial projections are used and compared with the most recent financial results in the fair value measurement.

The liability for contingent consideration is established at the time of the acquisition and is evaluated quarterly. The current liability is included in the Condensed Consolidated Balance Sheets in other and the non-current portion is included in other long-term liabilities. Fair value adjustments are included in the Condensed Consolidated Statements of Operations and Comprehensive Income in selling, general and administrative expenses.

The contingent consideration obligations measured at fair value on a recurring basis follow (in thousands):

	As of March 31, 2014
	Fair Value Measurements Using							Total
	Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	(Level 1)		(Level 2)		(Level 3)
Contingent consideration	$	—	$	—	$	(7,860	)	$	(7,860	)
	As of December 31, 2013
	Fair Value Measurements Using							Total
	Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	(Level 1)		(Level 2)		(Level 3)
Contingent consideration	$	—	$	—	$	(8,527	)	$	(8,527	)

9

Reconciliations of liabilities measured and carried at fair value on a recurring basis with the use of significant unobservable inputs (Level 3) are as follows (in thousands):

	Three Months Ended
	March 31,
	2014			2013
Contingent consideration
Balance at beginning of period	$	(8,527	)	$	(7,577	)
Payments on contingent consideration	691			—
Fair value adjustment	—			830
Foreign currency translation adjustment	(24		)	203
Balance at end of period	$	(7,860	)	$	(6,544	)

Certain assets and liabilities, such as goodwill, are not measured at fair value on an ongoing basis but are subject to fair value adjustments in certain circumstances (e.g., when there is evidence of impairment). For the three months ended March 31, 2014, no fair value adjustments were required for non-financial assets or liabilities.

7.Goodwill and Identifiable Intangible Assets. During the quarter ended March 31, 2014, the Company underwent a restructuring resulting in a change in the Company's reportable segments. The goodwill related to the former Life Sciences segment has been allocated to the respective segments below based upon the relative fair value of each component of the former Life Sciences segment. All prior periods have been retrospectively restated to conform to the current presentation. See Note 12 Segment Reporting for further information.The changes in the carrying amount of goodwill for the year endedDecember 31, 2013and thethree months endedMarch 31, 2014were as follows (in thousands):

	Apex		Oxford		Physician		Life Sciences Europe		Healthcare			Total
Balance as of December 31, 2012
Gross goodwill	$	289,712	$	150,619	$	51,561	$	3,753	$	122,230		$	617,875
Accumulated impairment loss	—		—		—		—		(121,717		)	(121,717		)
	289,712		150,619		51,561		3,753		513			496,158
Whitaker Acquisition (see Note 3)	—		—		7,452		—		—			7,452
CyberCoders Acquisition (see Note 3)	—		70,527		—		—		—			70,527
Divestiture - gross goodwill	—		—		—		—		(121,717		)	(121,717		)
Divestiture - accumulated impairment loss	—		—		—		—		121,717			121,717
Transfers	—		513		—		—		(513		)	—
Translation adjustment	—		—		—		811		—			811
Balance as of December 31, 2013
Gross goodwill	289,712		221,659		59,013		4,564		—			574,948
Accumulated impairment loss	—		—		—		—		—			—
	289,712		221,659		59,013		4,564		—			574,948
Acquisition accounting	—		257		—		—		—			257
Translation adjustment	—		—		—		20		—			20
Balance as of March 31, 2014
Gross goodwill	289,712		221,916		59,013		4,584		—			575,225
Accumulated impairment loss	—		—		—		—		—			—
	$	289,712	$	221,916	$	59,013	$	4,584	$	—		$	575,225

10

As of March 31, 2014 and December 31, 2013, the Company had the following acquired intangible assets (in thousands):

		2014						2013
	Estimated Useful Life	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Intangible assets subject to amortization:
Customer relations	3 months – 10 years	$	110,007	$	45,633	$	64,374	$	110,007	$	41,564	$	68,443
Contractor relations	2 - 7 years	43,598		31,907		11,691		43,598		30,737		12,861
Non-compete agreements	2 - 7 years	3,863		1,570		2,293		3,863		1,424		2,439
In-use software	6 years	18,900		1,051		17,849		18,900		263		18,637
		176,368		80,161		96,207		176,368		73,988		102,380
Intangible assets not subject to amortization:
Trademarks		186,075		—		186,075		186,075		—		186,075
Goodwill		575,225		—		575,225		574,948		—		574,948
Total		$	937,668	$	80,161	$	857,507	$	937,391	$	73,988	$	863,403

Amortization expense for intangible assets with finite lives was $6.2 million and $5.4 million for the three months endedMarch 31, 2014 and 2013, respectively. Estimated amortization for the remainder of this fiscal year, each of the next four fiscal years and thereafter follows (in thousands):

2014	$	18,339
2015	21,326
2016	17,720
2017	12,887
2018	10,306
Thereafter	15,629
	$	96,207

Goodwill and other intangible assets having an indefinite useful life are not amortized for financial statement purposes. Goodwill and intangible assets with indefinite lives are reviewed for impairment on an annual basis on October 31 and whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. There were no triggering events that required an interim impairment analysis during the current period.

8.Incentive Award Plan and Employee Stock Purchase Plan.On January 2, 2014, the Chief Executive Officer (the "CEO") was awarded 23,255 performance-based restricted stock units ("RSUs") with a grant date fair market value of $0.8 million, which will vest on January 4, 2015, contingent upon the Company achieving certain financial performance objectives based on Adjusted EBITDA (earnings before interest, taxes, depreciation, and amortization of identifiable intangible assets, but excluding gains, losses or expenses associated with unusual items such as equity-based compensation expense, impairment charges and acquisition, integration and strategic planning expenses) during 2014. OnMarch 26, 2014, the CEO was awarded91,569performance-based RSUs with a grant date fair market value of$3.3 million, which will vest inthreeequal annual increments on January 4, 2015, January 4, 2016 and January 4, 2017, contingent upon the Company achieving certain financial performance objectives based on Adjusted EBITDA during 2014. OnMarch 26, 2014, the CEO was awarded a performance-based award which had a grant date fair market value of $0.5 million, which will vest on January 2, 2015, contingent upon the Company meeting certain financial performance objectives during 2014. The Company classifies this award as a liability award until the number of shares is determined on the settlement date, by dividing $0.5 million by the closing price of the Company’s stock on the settlement date. The grant date fair market value of the RSUs described in this paragraph is expensed over the vesting term, based on an estimate of the percentage achievement of the applicable performance targets. All awards are subject to the CEO’s continued employment through applicable vesting dates. All awards may vest on an accelerated basis in part or in full upon the occurrence of certain events.

On March 26, 2014, the Company granted 27,141 performance-based RSUs to certain other executive officers with an aggregate grant date fair value of $1.0 million, which will vest on January 2, 2015, subject to continued employment and the Company attaining certain performance objectives during 2014, as approved by the Compensation Committee. Compensation expense for the performance-based component of these awards is recognized over the vesting period, based on an estimate of the percentage achievement of the targets for these awards.

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On March 26, 2014, the Company granted 60,244 performance-based RSU grants to certain Apex employees with an aggregate grant date fair value of $2.2 million, which vest, if the performance objective is attained, in 12 equal installments beginning on April 1, 2015 and quarterly thereafter, subject to continued employment through each vesting date. Compensation expense for the performance-based component of these awards is recognized over the vesting period, based on an estimate of the percentage achievement of the targets for these awards.

On March 31, 2014, the Company issued 90,837 sharesof common stock under the On Assignment 2010 Employee Stock Purchase Plan (the "ESPP"). 

Compensation expense related to stock-based compensation, including the ESPP, was $3.2 million and $2.5 million for the three months endedMarch 31, 2014 and 2013, respectively. Stock-based compensation is included in the Condensed Consolidated Statements of Operations and Comprehensive Income in selling, general and administrative expenses. 

9.Commitments and Contingencies.

The Company carries large retention policies for its workers’ compensation liability and its medical malpractice exposures. The workers' compensation and medical malpractice loss reserves are based upon an actuarial report obtained from a third party and determined based on claims filed and claims incurred but not reported. The Company accounts for claims incurred but not yet reported based on estimates derived from historical claims experience and current trends of industry data. Changes in estimates, differences in estimates, and actual payments for claims, are recognized in the period that the estimates changed or the payments were made. The workers' compensation and medical malpractice loss reserves were approximately $11.8 million and $11.6 million, net of anticipated insurance and indemnification recoveries of $20.0 million and $21.2 million, at March 31, 2014 and December 31, 2013, respectively. Included in these amounts is one claim related to our discontinued operations for $11.0 million and $11.1 million, as of March 31, 2014 and December 31, 2013, respectively. This claim is above the Company’s retention amount and will be recovered from the insurance company.

The Company has unused stand-by letters of credit outstanding to secure obligations for workers’ compensation claims with various insurance carriers. The unused stand-by letters of credit at March 31, 2014 and December 31, 2013 were $3.0 million and $2.7 million, respectively.

The Company is subject to contingent consideration agreements entered into in connection with certain of its acquisitions. If the acquired businessesmeet predetermined targets, the Company is obligated to make additional cash payments in accordance with the terms of such contingent consideration agreements. As of March 31, 2014, the Company has potential future contingent consideration of $16.0 million through 2015.

The Company has entered into various non-cancelable operating leases, primarily related to its facilities and certain office equipment used in the ordinary course of business. The Company leases two properties owned by related parties.

At March 31, 2014 and December 31, 2013, the Company has an income tax reserve in other long-term liabilities related to uncertain tax positions of $1.6 million. The Company is unable to make reasonably reliable estimates of the period of cash settlement since the statute of limitations might expire without examination by the respective tax authority.

The Company is involved in various legal proceedings, claims and litigation arising in the ordinary course of business. The Company has accrued approximately $2.1 million for a settlement, inclusive of all plaintiffs’ costs and legal expenses, to resolve an alleged class action dispute regarding the payment of certain of our nurses when the Company owned a Nurse Travel division from 2008 to 2013. Based on the facts currently available, the Company does not believe that the disposition of matters that are pending or asserted will have a material effect on its consolidated financial statements.

10.Earnings per share.Basic earnings per share are computed based upon the weighted average number of common shares outstanding. Diluted earnings per share are computed based upon the weighted average number of common shares outstanding and dilutive common share equivalents (consisting of incentive stock options, non-qualified stock options and restricted stock awards and units and employee stock purchase plan shares) outstanding during the periods using the treasury stock method.

The following is a reconciliation of the shares used to compute basic and diluted earnings per share (in thousands):

	Three Months Ended
	March 31,
	2014	2013
Weighted average number of common shares outstanding used to compute basic earnings per share	54,104	53,046
Dilutive effect of stock-based awards	871	990
Number of shares used to compute diluted earnings per share	54,975	54,036

There were 10,000 and 77,000 weighted average share equivalents outstanding during the three months endedMarch 31, 2014 and 2013, respectively, that were excluded from the computation of diluted earnings per share because the exercise price for these options was

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greater than the average market price of the Company’s shares of common stock during the respective periods that became anti-dilutive when applying the treasury stock method.

11. Income Taxes. For interim reporting periods, the Company prepares an estimate of the full-year income and the related income tax expense for each jurisdiction in which the Company operates. Changes in the geographical mix, permanent differences or estimated level of annual pretax income can impact the Company’s actual effective rate.

12.Segment Reporting.The Company has four reportable segments: Apex, Oxford, Physician, and Life Sciences Europe. During the quarter ended March 31, 2014, the Company underwent a restructuring that realigned the former Life Sciences segment. As a result of this realignment, Lab Support U.S. is now included in the Apex segment; Valesta U.S. is now included in the Oxford segment; and the Life Sciences Europe segment includes Lab Support Europe, Valesta Europe, and Sharpstream. During 2013, the Company sold its Nurse Travel line of business and most of the Allied Healthcare line of business. See Note 4 Discontinued Operations for further information. The divestitures resulted in changes to the internal reporting package reviewed by the Chief Operating Decision Maker ("CODM"), and the Healthcare segment no longer exists. Health Information Management, formerly included in the Healthcare Segment, is included in the Oxford Segment and unallocated corporate expenses are separately disclosed in order to align with the revised internal reporting package reviewed by the CODM. All prior periods have been retrospectively restated to conform to the current presentation.

The Company’s management evaluates the performance of each segment primarily based on revenues, gross profit, and operating income. The information in the following table is derived directly from the segments’ internal financial reporting used for corporate management purposes. The Company's management does not evaluate, manage or measure performance of segments using asset information, and such information is not readily available. Accordingly, assets by reportable segment are not disclosed.

The following tables present revenues, gross profit, operating income and amortization by reportable segment for the three months endedMarch 31, 2014 and 2013 (in thousands):

2014:	Apex		Oxford		Physician		Life Sciences Europe		Corporate			Total
Revenues	$	278,408	$	117,500	$	31,791	$	11,575	$	—		$	439,274
Gross profit	75,506		49,026		8,838		4,218		—			137,588
Operating income	22,784		14,284		1,259		1,199		(12,244		)	27,282
Amortization	4,089		1,370		634		71		8			6,172

2013:	Apex		Oxford		Physician		Life Sciences Europe		Corporate			Total
Revenues	$	239,765	$	102,688	$	26,302	$	10,289	$	—		$	379,044
Gross profit	63,981		34,815		7,483		3,832		—			110,111
Operating income	17,229		13,666		2,426		533		(10,999		)	22,855
Amortization	4,881		107		176		160		55			5,379

The Company operates internationally, with operations mainly in the United States, Europe, Canada, Australia and New Zealand. The following table presents domestic and foreign revenues (in thousands):

	Three Months Ended
	March 31,
	2014		2013
Revenues:
Domestic	$	418,664	$	358,648
Foreign	20,610		20,396
	$	439,274	$	379,044

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Item 2 - Management’s Discussion and Analysis of Financial Condition and Results of Operations

The information in this discussion contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended (the “Securities Act”), and Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). Such statements are based upon current expectations that involve risks and uncertainties. Any statements contained herein that are not statements of historical fact may be deemed to be forward-looking statements. For example, the words “believes,” “anticipates,” “plans,” “expects,” “intends,” and similar expressions are intended to identify forward-looking statements. Forward-looking statements include statements regarding our anticipated financial and operating performance for future periods. Our actual results could differ materially from those discussed herein. Factors that could cause or contribute to such differences include, but are not limited to, the following: (1) actual demand for our services as impacted by the general economic environment; (2) our ability to attract, train and retain qualified staffing consultants; (3) our ability to remain competitive in obtaining and retaining temporary staffing clients; (4) the availability of qualified contract professionals; (5) our ability to manage our growth efficiently and effectively; (6) continued performance of our enterprise-wide information systems; (7) our ability to manage our medical malpractice and other potential or actual litigation matters; (8) the successful integration of our recently acquired subsidiaries; (9) the successful implementation of our five-year strategic plan and (10) other risks detailed from time to time in our reports filed with the Securities and Exchange Commission (the "SEC"), including in our Annual Report on Form 10-K, for the year ended December 31, 2013, as filed with the SEC on March 3, 2014, under the section “Risk Factors.” Other factors also may contribute to the differences between our forward-looking statements and our actual results. In addition, as a result of these and other factors, our past financial performance should not be relied on as an indication of future performance. All forward-looking statements in this document are based on information available to us as of the date we file this Quarterly Report on Form 10-Q, and we assume no obligation to update any forward-looking statement or the reasons why our actual results may differ.

OVERVIEW

On Assignment, Inc. is a leading global provider of in-demand, skilled professionals in the growing technology, healthcare, and life sciences sectors. We provide clients with short-term and long-term placement of contract, contract-to-hire, and direct hire professionals.

Our Apex segment serves clients’ needs for high-volume IT and scientific staffing and includes our Apex Systems and Lab Support divisions in the United States. Apex Systems provides mission-critical daily IT operation professionals for contract and contract-to-hire positions to Fortune 1000 and mid-market clients, and offers recruitment solutions for other professional skills and workforce needs. Lab Support provides locally-based contract scientific professionals to clients in the biotechnology, pharmaceutical, food and beverage, medical device, personal care, chemical, automotive, educational and environmental industries.

Our Oxford segment specializes in delivering high-end professionals for contract and direct hire positions and includes our Oxford Global Resources and CyberCoders divisions. Oxford Global Resources proactively recruits and delivers seasoned IT, engineering, regulatory and compliance, health information management, and clinical research professionals for consulting assignments across North America and Europe. It includes our Oxford International, Oxford Healthcare IT, On Assignment Health Information Management, and Valesta U.S. brands. CyberCoders recruits professionals predominately for permanent placements in engineering, technology, sales, executive, financial, accounting, scientific, legal and operational positions across all industries throughout the United States.

Our Physician segment provides short-term and long-term physician staffing (locum tenens) services and full-service physician search and consulting services, primarily in the United States, with some locum tenens placements in Australia and New Zealand. We work with physicians in a wide range of specialties, placing them in hospitals, community-based practices and federal, state and local facilities. Our Physician segment includes our Vista Staffing Solutions brand.

Our Life Sciences Europe segment includes the Lab Support, Valesta, and Sharpstream brands in Europe.

Seasonality

Demand for our staffing services historically has been lower during the first and fourth quarters due to fewer business days resulting from client shutdowns, adverse weather conditions and a decline in the number of contract professionals willing to work during the holidays. Demand for our staffing services usually increases in the second and third quarters of the year. In addition, our cost of services typically increases in the first quarter primarily due to the reset of payroll taxes.

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RESULTS OF OPERATIONS

CHANGES IN RESULTS OF OPERATIONS FOR THE THREE MONTHS ENDED MARCH 31, 2014 COMPARED WITH THE THREE MONTHS ENDED MARCH 31, 2013

Revenues by segment (in thousands):

	Three Months Ended				Change
	March 31,
	2014		2013		$		%
Apex	$	278,408	$	239,765	$	38,643	16.1	%
Oxford	117,500		102,688		14,812		14.4	%
Physician	31,791		26,302		5,489		20.9	%
Life Sciences Europe	11,575		10,289		1,286		12.5	%
	$	439,274	$	379,044	$	60,230	15.9	%

Revenues increased $60.2 million, or 15.9 percent, and 9.8 percent on a pro forma basis, assuming the acquisitions of Whitaker and CyberCoders occurred at the beginning of 2012. The increase in revenues is due to year-over-year organic growth of 9.4 percent and the acquisitions of Whitaker and CyberCoders, which contributed $24.7 million of revenues in the quarter.

Apex's revenues for the quarter were $278.4 million, or 63.4 percent of total revenues. Revenues from Apex increased $38.6 million, or 16.1 percent, comprised of a 13.9 percent increase in the average number of contract professionals on assignment and a 0.6 percent increase in the average bill rate.

Oxford's revenues increased $14.8 million, or 14.4 percent, due to the inclusion of $17.4 million of revenues from CyberCoders, which was acquired in December 2013. Excluding the contribution from CyberCoders, revenues were down approximately 2.5 percent year-over-year primarily due to the completion of a large project in 2013.

Physician's revenues increased $5.5 million, or 20.9 percent, due to the inclusion of Whitaker, which accounted for $7.3 million of the Physician segment’s revenues in the quarter. Excluding the contribution from Whitaker, revenues were down 6.8 percent year-over-year. This decline was attributable to lower demand from several long-term clients related to overall budget decreases and in our government practice. While government demand continues to be lower year-over-year, demand from our commercial clients is improving. Average bill rates were flat compared to the prior year period.

Life Sciences Europe's revenues increased $1.3 million, or 12.5 percent, due to a 11.8 percent increase in the average number of contract professionals. The growth relates to an improved operating environment across all core industries, new project awards within targeted accounts with biotechnology and pharmaceuticals leading demand for contract and direct hire services in Europe.

Gross Profit and Gross Margin by segment (dollars in thousands):

	Three Months Ended
	March 31,
	2014				2013
	Gross Profit		Gross Margin		Gross Profit		Gross Margin
Apex	$	75,506	27.1	%	$	63,981	26.7	%
Oxford	49,026		41.7	%	34,815		33.9	%
Physician	8,838		27.8	%	7,483		28.5	%
Life Sciences Europe	4,218		36.4	%	3,832		37.2	%
	$	137,588	31.3	%	$	110,111	29.0	%

Gross profit increased $27.5 million, or 25.0 percent, as a result of the increase in revenues and expansion in gross margin. Gross margin for the quarter was 31.3 percent, up approximately 230 basis points year-over-year. The increase in gross margin was primarily due to the higher mix of direct hire and conversion fee revenues (4.6 percent of revenues for the current quarter compared with 1.9 percent for the first quarter of 2013). The improvement in mix is due to $13.3 million in conversion and permanent placement revenues from CyberCoders, which was acquired in December 2013.

Apex's gross profit increased $11.5 million, or 18.0 percent, as a result of the year-over-year increase in revenues. Gross margin for the quarter was 27.1 percent, up approximately 40 basis points year-over-year.

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Oxford's gross profit increased $14.2 million, or 40.8 percent. Oxford's gross margin for the quarter was 41.7 percent, up from 33.9 percent in the same period of 2013. The expansion is due to the contribution from CyberCoders, whose revenues are predominantly permanent placement fees, which have a gross margin above 90 percent.

Physician's gross profit increased $1.4 million, or 18.1 percent due to the acquisition of Whitaker, partially offset by a 65 basis points compression in gross margin. The compression in gross margin was due to a lower mix of conversion and permanent placement revenues, which were 2.3 percent of revenues in the current quarter down from 3.9 percent in the same period of 2013.

Life Sciences Europe's gross profit increased 10.1 percent, as a result of the 12.5 percent increase in revenues, partially offset by a 80 basis points compression in gross margin. The compression was primarily due to a 1.4 percent decrease in bill/pay spread due to competitive pricing pressures.

Selling, General and Administrative Expenses

For the quarter ended March 31, 2014, selling, general and administrative ("SG&A") expenses were $104.1 million (23.7 percent of revenues), up from $81.9 million (21.6 percent of revenues) for the same period of 2013. The increase in the SG&A expense margin was due to the inclusion of CyberCoders, which has higher gross and expense margins than our other business units. SG&A expenses for the quarter included acquisition, integration and strategic planning expenses of $0.8 million.

Amortization of Intangible Assets

Amortization of intangible assets for the quarter was $6.2 million, compared with $5.4 million in the same period of 2013. The increase related to amortization from the businesses acquired in December 2013.

Interest Expense, Net

Interest expense (net of interest income) for the quarter was $3.3 million, compared with $5.1 million in the same period of 2013.  Interest expense for the quarter was comprised of interest on the credit facility of $3.0 million and amortization of capitalized loan costs of $0.3 million. The decrease in interest expense related to lower interest rates under the credit facility that went into place in May 2013 and the February 2014 amendment that effectively lowered the interest rate on $82.5 million in debt by approximately 130 basis points.

In February 2014, we amended our credit facility resulting in an increase in borrowings under our term A loan facility of $82.5 million to $175.0 million and a pay down on the term B loan facility by the same amount. This amendment is estimated to have an annual interest savings of approximately $1.0 million.

Provision for Income Taxes

The provision for income taxes was $9.9 million for the quarter, compared with $7.5 million for the same period in 2013. The effective tax rate for the quarter was 41.4 percent, compared with 42.5 percent for the same period in 2013. The improvement in the effective tax rate for the quarter was due to an increase in pre-tax income and a lower mix of non-deductible expenses.

Discontinued operations

We sold our Nurse Travel division in February 2013 for $33.7 million and our Allied Healthcare division in December 2013 for $28.7 million. These units formerly comprised our Healthcare segment. As a result of these sales, operating results and the gain on sale of these divisions, net of income tax, are presented as discontinued operations in our Condensed Consolidated Statements of Operations and Comprehensive Income for all periods presented. Loss from discontinued operations, net of income taxes, was $0.1 million for the quarter ended March 31, 2014, compared with $15,000 in the same period of 2013.

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Liquidity and Capital Resources

Our working capital as of March 31, 2014 was $190.5 million and our cash and cash equivalents were $23.4 million, of which $8.1 million was held in foreign countries. Cash held in foreign countries is not available to fund domestic operations unless repatriated, which would require the accrual and payment of taxes. We do not intend to repatriate cash held in foreign countries. Our operating cash flows and borrowings under our credit facilities have been our primary source of liquidity and have been sufficient to fund our working capital and capital expenditure needs. Our working capital requirements consist primarily of the financing of accounts receivable, payroll expenses and debt service payments on our credit facilities. We believe that our working capital as of March 31, 2014, availability under our revolving credit facility and expected operating cash flows will be sufficient to meet our future debt obligations, working capital requirements and capital expenditures for the next 12 months.

Net cash used in operating activities was $4.3 million for the quarter, compared with $3.6 million provided by operating activities for the same period of 2013. Net cash used in operating activities in the current period was comprised of net income of $13.9 million, non-cash items of $13.7 million, offset by $31.9 million due to the increase in net operating assets. The increase in net operating assets is related to the growth of the business and a tax payment of $10.4 million related to the gain on the sale of Allied Healthcare. Net cash provided by operating activities in the same period of 2013 was comprised of net income of $24.6 million, partially offset by non-cash items of $3.4 million, and $17.6 million due to the increase in net operating assets. The increase in net operating assets was primarily related to the increase in accounts receivable, as a result of the growth in the business, partially offset by the increase in accrued payroll and contract professional pay.

Net cash used in investing activities was $3.9 million for the quarter, compared with $24.4 million provided by investing activities for the same period of 2013. During the three months endedMarch 31, 2014, capital expenditures were $4.0 million. In the same period of 2013, we sold our Nurse Travel division for $33.7 million cash. We estimate that capital expenditures for the full year 2014 will be approximately $19.7 million.

Net cash used in financing activities was $5.4 million for the quarter, compared with $43.4 million used in financing activities in the same period of 2013. Net cash used in financing activities for the three months endedMarch 31, 2014 consisted primarily of $105.5 million in principal payments of long-term debt, partially offset by proceeds of $99.5 million from new borrowings on the revolving credit facility. Net cash used in financing activities in the same period of 2013 consisted primarily of $43.0 million in principal payments of long-term debt.

Under terms of our credit facility, we will be required to make quarterly payments of $4.6 million on the term A loan facility. We are also required to make mandatory prepayments from excess cash flow and the proceeds of asset sales, debt issuances and specified other events. The maximum ratio of consolidated funded debt to consolidated EBITDA steps down from 4.00 to 1.00 as of March 31, 2014 to 3.25 to 1.00 as of June 30, 2015. As of March 31, 2014, the leverage ratio was 2.12 to 1.00. Additionally, the credit facility, which is secured by substantially all of our assets, provides for certain limitations on our ability to, among other things, incur additional debt, offer loans, and declare dividends. As of March 31, 2014, we had $81.0 million of borrowings available under our revolving credit facility.

Recent Accounting Pronouncements

In April 2014, the Financial Accounting Standards Board issued Accounting Standards Update No. 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity ("ASU 2014-08"). ASU 2014-08 amends the definition of a discontinued operation and requires entities to provide additional disclosures for both discontinued operations and disposal transactions that do not meet the discontinued-operations criteria. It is effective for annual periods beginning on or after December 15, 2014. We do not expect the adoption of this guidance to have a material effect on our consolidated financial statements.

Critical Accounting Policies

There have been no significant changes to our critical accounting policies and estimates during the quarter ended March 31, 2014 compared with those disclosed in Item 7, Management’s Discussion and Analysis of Financial Condition and Results of Operations of our Annual Report on Form 10-K for the year ended December 31, 2013, as filed with the SEC on March 3, 2014.

Commitments

In connection with certain acquisitions, we are subject to contingent consideration agreements. If the acquired businesses meet predetermined targets, we are obligated to make additional cash payments in accordance with the terms of such contingent consideration agreements. As of March 31, 2014, we have potential future contingent consideration of approximately $16.0 million through 2015.

Other than those described above, we have not entered into any significant commitments or contractual obligations that have not been previously disclosed in our Annual Report on Form 10-K for the year ended December 31, 2013, as filed with the SEC on March 3, 2014.

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Item 3 - Quantitative and Qualitative Disclosures about Market Risk

There have been no material changes to the information included in our Annual Report on Form 10-K for the year ended December 31, 2013. We are exposed to certain market risks arising from transactions in the normal course of business, principally risks associated with foreign currency fluctuations and changes in interest rates. We are exposed to foreign currency risk from the translation of foreign operations into U.S. dollars. Based on the relative size and nature of our foreign operations, we do not believe that a 10 percent change in the value of foreign currencies relative to the U.S. dollar would have a material impact on our financial statements. Our primary exposure to market risk is interest rate risk associated with our debt instruments. See Notes to the Condensed Consolidated Financial Statements for further description of our debt instruments. Excluding the effect of our interest rate caps, a hypothetical 100 basis point change in interest rates on variable rate debt would have resulted in interest expense fluctuating approximately $3.9 million based on $393.8 million of debt outstanding for any 12 month period. We have not entered into any market risk sensitive instruments for trading purposes.

Item 4 - Controls and Procedures

As of the end of the period covered by this report, we carried out an evaluation, under the supervision and with the participation of our management, including our CEO and Principal Financial and Accounting Officer, of the effectiveness of our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) of the Exchange Act). Based on this evaluation, our CEO and Principal Financial and Accounting Officer have concluded that our disclosure controls and procedures are effective as of the end of the period covered by this report. The term “disclosure controls and procedures” means controls and other procedures of the Company that are designed to ensure that information required to be disclosed by the Company in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported within required time periods. We have established disclosure controls and procedures to ensure that information required to be disclosed by the Company in the reports that it files or submits under the Exchange Act is accumulated and communicated to management, including our CEO and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosure.

There have been no changes in our internal control over financial reporting that occurred during the quarter ended March 31, 2014 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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PART II – OTHER INFORMATION

Item 1 – Legal Proceedings

We are involved in various legal proceedings, claims and litigation arising in the ordinary course of business. However, based on the facts available, we do not believe that the disposition of matters that are pending or asserted will have a material effect on our financial position, results of operations or cash flows.

Item 1A – Risk Factors

Information regarding risk factors affecting our business is discussed in our Annual Report on Form 10-K for the year ended December 31, 2013.

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Item 6 - Exhibits

INDEX TO EXHIBITS

Number		Footnote	Description
3.1		(1)	Amended and Restated Certificate of Incorporation of On Assignment, Inc., dated April 14, 1993
3.2		(2)	Certificate of Amendment of Restated Certificate of Incorporation of On Assignment, Inc., dated August 17, 2000
3.3		(3)	Amended and Restated Bylaws of On Assignment, Inc., dated January 28, 1998
4.1		(4)	Specimen Common Stock Certificate
31.1		*	Certification of Peter T. Dameris, President and Chief Executive Officer pursuant to Rule 13a-14(a) or 15d-14(a)
31.2		*	Certification of Edward L. Pierce, Executive Vice President and Chief Financial Officer pursuant to Rule 13a-14(a) or 15d-14(a)
32.1		*	Certification of Peter T. Dameris, President and Chief Executive Officer pursuant to 18 U.S.C. Section 1350
32.2		*	Certification of Edward L. Pierce, Executive Vice President and Chief Financial Officer pursuant to 18 U.S.C. Section 1350
101.INS		*	XBRL Instance Document
101.SCH		*	XBRL Taxonomy Extension Schema Document
101.CAL		*	XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF		*	XBRL Taxonomy Extension Definition Linkbase Document
101.LAB		*	XBRL Taxonomy Extension Label Linkbase Document
101.PRE		*	XBRL Taxonomy Extension Presentation Linkbase Document
*	Filed herewith.
(1)	Incorporated by reference from an exhibit filed with our Quarterly Report on Form 10-Q for the period ended June 30, 2013 filed on August 2, 2013.
(2)	Incorporated by reference from an exhibit filed with our Current Report on Form 8-K filed on October 5, 2000.
(3)	Incorporated by reference from an exhibit filed with our Current Report on Form 8-K filed on May 3, 2002.
(4)	Incorporated by reference from an exhibit filed with our Registration Statement on Form S-1 (File No. 33-50646) declared effective by the Securities and Exchange Commission on September 21, 1992.

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SIGNATURE

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

	ON ASSIGNMENT, INC.
Date: May 9, 2014	By:	/s/ Edward L. Pierce
		Edward L. Pierce
		Executive Vice President and Chief Financial Officer
		(Principal Financial and Accounting Officer)

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EX-31.1

Exhibit 31.1

CERTIFICATION PURSUANT TO RULES 13a-14(a) 

UNDER THE SECURITIES EXCHANGE ACT OF 1934 AS ADOPTED PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Peter T. Dameris, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q for the period ended March 31, 2014 of On Assignment, 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 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 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 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: May 9, 2014

/s/ Peter T. Dameris

Peter T. Dameris

President and Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION PURSUANT TO RULES 13a-14(a) 

UNDER THE SECURITIES EXCHANGE ACT OF 1934 AS ADOPTED PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Edward L. Pierce certify that:

1. I have reviewed this Quarterly Report on Form 10-Q for the period ended March 31, 2014 of On Assignment, 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 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 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 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: May 9, 2014

/s/ Edward L. Pierce

Edward L. Pierce

Executive Vice President and Chief Financial Officer

EX-32.1

Exhibit 32.1

Certification Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (18 U.S.C. Section 1350)

The undersigned, the Chief Executive Officer of On Assignment, Inc. (the "Company"), hereby certifies that, to his knowledge on the date hereof:

(a) the Quarterly Report on Form 10-Q of the Company for the period ended March 31, 2014 filed on the date hereof with the Securities and Exchange Commission (the "Report") fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(b) information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: May 9, 2014	By:	/s/ Peter T. Dameris
		Peter T. Dameris
		President and Chief Executive Officer

EX-32.2

Exhibit 32.2

Certification Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (18 U.S.C. Section 1350)

The undersigned, the Chief Financial Officer of On Assignment, Inc. (the "Company"), hereby certifies that, to his knowledge on the date hereof:

(a) the Quarterly Report on Form 10-Q of the Company for the period ended March 31, 2014 filed on the date hereof with the Securities and Exchange Commission (the "Report") fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(b) information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: May 9, 2014	By:	/s/ Edward L. Pierce
		Edward L. Pierce
		Executive Vice President and Chief Financial Officer

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Incentive Award Plan and Employee Stock Purchase Plan (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended		0 Months Ended
	Mar. 31, 2014 2010 Employee Stock Purchase Plan (ESPP)	Mar. 26, 2014 Chief Executive Officer Performance Based Award	Mar. 26, 2014 Other Executive Officers Performance Based Award	Mar. 26, 2014 Apex employees [Domain] Performance Based Award installment	Jan. 02, 2014 Tranche A [Member] Chief Executive Officer Performance Based Award	Mar. 26, 2014 Tranche B [Member] Chief Executive Officer Performance Based Award installment
Deferred Compensation Arrangement with Individual, Share-based Payments
Share-based awards, grant date fair market value		$ 0.5	$ 1.0	$ 2.2	$ 0.8	$ 3.3
Share-based awards, grants in period			27,141	60,244	23,255	91,569
Share-based awards, number of equal vesting components				12		3
Employee stock purchase plan shares issued during period	90,837

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Fair Value Measurements (Fair Value Inputs, Liabilities, Quantitative Information) (Details) (USD $)	0 Months Ended
	Mar. 31, 2014
Fair Value Inputs, Liabilities, Quantitative Information
Long-term Debt	$ 393,813,000
Level 2 Inputs
Fair Value Inputs, Liabilities, Quantitative Information
Long-term debt, fair value	$ 393,300,000
Significant Unobservable Inputs (Level 3) | Contingent Consideration Liability | Minimum [Member]
Fair Value Inputs, Liabilities, Quantitative Information
Probability of occurrence of scenarios (as a percentage)	10.00%
Significant Unobservable Inputs (Level 3) | Contingent Consideration Liability | Maximum [Member]
Fair Value Inputs, Liabilities, Quantitative Information
Probability of occurrence of scenarios (as a percentage)	60.00%
CyberCoders [Member] | Significant Unobservable Inputs (Level 3) | Contingent Consideration Liability
Fair Value Inputs, Liabilities, Quantitative Information
Weighting given to base case scenario (as a percentage)	50.00%
CyberCoders [Member] | Significant Unobservable Inputs (Level 3) | Contingent Consideration Liability | Minimum [Member]
Fair Value Inputs, Liabilities, Quantitative Information
Revenue growth rates (as a percentage)	9.60%
CyberCoders [Member] | Significant Unobservable Inputs (Level 3) | Contingent Consideration Liability | Maximum [Member]
Fair Value Inputs, Liabilities, Quantitative Information
Revenue growth rates (as a percentage)	25.00%
Whitaker [Member] | Significant Unobservable Inputs (Level 3) | Contingent Consideration Liability
Fair Value Inputs, Liabilities, Quantitative Information
Weighting given to base case scenario (as a percentage)	60.00%
Whitaker [Member] | Significant Unobservable Inputs (Level 3) | Contingent Consideration Liability | Minimum [Member]
Fair Value Inputs, Liabilities, Quantitative Information
Revenue growth rates (as a percentage)	2.00%
Whitaker [Member] | Significant Unobservable Inputs (Level 3) | Contingent Consideration Liability | Maximum [Member]
Fair Value Inputs, Liabilities, Quantitative Information
Revenue growth rates (as a percentage)	15.00%

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Earnings per share (Tables)

3 Months Ended

Mar. 31, 2014

Earnings Per Share [Abstract]

Reconciliation of Shares Used to Compute Basic and Diluted Earnings per Share

The following is a reconciliation of the shares used to compute basic and diluted earnings per share (in thousands):

	Three Months Ended
	March 31,
	2014	2013
Weighted average number of common shares outstanding used to compute basic earnings per share	54,104	53,046
Dilutive effect of stock-based awards	871	990
Number of shares used to compute diluted earnings per share	54,975	54,036

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Earnings per share (Details)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Weighted Average Number of Shares Outstanding Reconciliation
Weighted average number of common shares outstanding used to compute basic earnings per share	54,104,000	53,046,000
Dilutive effect of stock-based awards	871,000	990,000
Number of shares used to compute diluted earnings per share	54,975,000	54,036,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	10,000	77,000

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Goodwill and Identifiable Assets (Acquired Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012
Intangible Assets [Line Items]
Amortization of intangible assets	$ 6,172	$ 5,379
Intangible assets subject to amortization:
Gross Carrying Amount	176,368		176,368
Accumulated Amortization	80,161		73,988
Net Carrying Amount	96,207		102,380
Intangible assets not subject to amortization:
Trademarks, Carrying Amount	186,075		186,075
Goodwill, Carrying Amount	575,225		574,948	496,158
Total
Gross Carrying Amount	937,668		937,391
Net Carrying Amount	857,507		863,403
Customer relations
Intangible assets subject to amortization:
Gross Carrying Amount	110,007		110,007
Accumulated Amortization	45,633		41,564
Net Carrying Amount	64,374		68,443
Customer relations | Minimum [Member]
Intangible Assets [Line Items]
Estimated Useful Life	3 months
Customer relations | Maximum [Member]
Intangible Assets [Line Items]
Estimated Useful Life	10 years
Contractor Relations [Member]
Intangible assets subject to amortization:
Gross Carrying Amount	43,598		43,598
Accumulated Amortization	31,907		30,737
Net Carrying Amount	11,691		12,861
Contractor Relations [Member] | Minimum [Member]
Intangible Assets [Line Items]
Estimated Useful Life	2 years
Contractor Relations [Member] | Maximum [Member]
Intangible Assets [Line Items]
Estimated Useful Life	7 years
Non-compete agreements
Intangible assets subject to amortization:
Gross Carrying Amount	3,863		3,863
Accumulated Amortization	1,570		1,424
Net Carrying Amount	2,293		2,439
Non-compete agreements | Minimum [Member]
Intangible Assets [Line Items]
Estimated Useful Life	2 years
Non-compete agreements | Maximum [Member]
Intangible Assets [Line Items]
Estimated Useful Life	7 years
Computer Software, Intangible Asset [Member]
Intangible Assets [Line Items]
Estimated Useful Life	6 years
Intangible assets subject to amortization:
Gross Carrying Amount	18,900		18,900
Accumulated Amortization	1,051		263
Net Carrying Amount	$ 17,849		$ 18,637

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Aquisitions

3 Months Ended

Mar. 31, 2014

Business Combinations [Abstract]

Acquisitions

Acquisitions. On December 5, 2013, the Company acquired all of the outstanding shares of CyberCoders Holdings, Inc. ("CyberCoders"), a provider of permanent placement services headquartered in Irvine, California. The primary reason for the acquisition was to expand the Company's permanent placement services. The purchase price was $98.6 million, comprised of $93.6 million in cash paid at closing and estimated future contingent consideration of $5.0 million, which is based on estimated financial performance of CyberCoders through 2015 (the maximum contingent consideration opportunity is $11.0 million). Acquisition costs of approximately $1.5 million were expensed in 2013. Goodwill deductible for tax purposes is $10.3 million for this transaction. The results of operations for the acquisition have been combined with those of the Company from the acquisition date.

On December 2, 2013, the Company acquired all of the outstanding membership interests of Whitaker Medical, LLC ("Whitaker"), a provider of physician staffing services headquartered in Houston, Texas. The primary reason for the acquisition was to expand the Company's Physician staffing services. The purchase price was $21.3 million, comprised of $18.5 million in cash paid at closing and estimated future contingent consideration of $2.8 million, which is based on estimated financial performance of Whitaker through 2015 (the maximum contingent consideration opportunity is $5.0 million). Acquisition costs of approximately $0.4 million were expensed in 2013. Goodwill of $7.5 million is deductible for tax purposes. The results of operations for the acquisition have been combined with those of the Company from the acquisition date.

Assets and liabilities of the acquired companies were recorded at their estimated fair values at the date of acquisition. The excess purchase price over the fair value of net tangible assets and identifiable intangible assets acquired has been allocated to goodwill. The fair value assigned to identifiable intangible assets was determined primarily by using a discounted cash flow method.

The Company's allocation of the purchase prices relating to the CyberCoders and Whitaker acquisitions remains incomplete with respect to opening net assets, intangible assets, taxes and contingent consideration. Material measurement period adjustments resulting from the finalization of the purchase price allocation will be recorded retrospectively to the acquisition date. The preliminary fair value of contingent consideration is based on the present value of the expected future payments to be made to the sellers of the acquired businesses in accordance with the respective purchase agreements. There are numerous inputs for this valuation, which the Company will finalize during the measurement period. Significant changes are likely and will change the contingent consideration and the amount allocated to goodwill. See Note 6 Fair Value Measurements for further information regarding the fair value of contingent consideration and the level 3 rollforward disclosure.

During the quarter ended March 31, 2014, the Company adjusted CyberCoder's purchase price allocation. The adjustment related to a net working capital adjustment, which was not material and had no impact on the consolidated statements of operations, and accordingly it was not presented retrospectively.

The following table summarizes (in thousands) the purchase price allocations for the acquisitions of CyberCoders and Whitaker, which are subject to finalization during the measurement period:

	2013 Acquisitions
	CyberCoders		Whitaker
Current assets	$	10,583	$	8,909
Property and equipment	3,790		272
Goodwill	70,784		7,452
Identifiable intangible assets	36,450		9,760
Other	915		568
Total assets acquired	$	122,522	$	26,961
Current liabilities	$	8,057	$	5,083
Other	15,817		551
Total liabilities assumed	23,874		5,634
Total purchase price	$	98,648	$	21,327

The following table summarizes (in thousands) the allocation of the purchase price among the identifiable intangible assets for the acquisitions of CyberCoders and Whitaker, which are subject to finalization during the measurement period:

		Identifiable Intangible Asset Value
	Useful life	CyberCoders		Whitaker
Contractor relationships	2.5 years	$	3,900	$	1,800
Customer relationships	3 – 7 years	750		5,900
Non-compete agreements	3 years	800		60
In-use software	6 years	18,900		—
Trademarks	indefinite	12,100		2,000
Total identifiable intangible assets acquired		$	36,450	$	9,760

The summary below (in thousands, except for per share data) presents unaudited pro forma consolidated results of operations for thethree months endedMarch 31,2013as if the acquisitions of Whitaker and CyberCoders occurred on January 1, 2012.The pro forma financial information gives effect to certain adjustments, including: amortization of intangible assets, interest expense on acquisition-related debt and provision for income taxes. Acquisition-related costs are assumed to have occurred at the beginning of the year prior to acquisition. The pro forma financial information is not necessarily indicative of the operating results that would have occurred if the acquisition had been consummated as of the date indicated, nor are they necessarily indicative of future operating results.

Revenues	$	400,022
Income from continuing operations	$	11,032
Net income	$	25,429
Basic earnings per share:
Income from continuing operations	$	0.21
Net income	$	0.48
Diluted earnings per share:
Income from continuing operations	$	0.20
Net income	$	0.47
Weighted average number of shares outstanding	53,046
Weighted average number of shares and dilutive shares outstanding	54,036

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Segment Reporting (Segment Reporting Information) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014 segment	Mar. 31, 2013
Segment Reporting [Abstract]
Reportable segments (in number of segments)	4
Revenues:
Revenues	$ 439,274	$ 379,044
Gross Profit:
Total Gross Profit	137,588	110,111
Operating Income (Loss):
Total Operating Income	27,282	22,855
Amortization of Intangible Assets	6,172	5,379
Apex
Revenues:
Revenues	278,408	239,765
Gross Profit:
Total Gross Profit	75,506	63,981
Operating Income (Loss):
Total Operating Income	22,784	17,229
Amortization of Intangible Assets	4,089	4,881
Oxford
Revenues:
Revenues	117,500	102,688
Gross Profit:
Total Gross Profit	49,026	34,815
Operating Income (Loss):
Total Operating Income	14,284	13,666
Amortization of Intangible Assets	1,370	107
Physician
Revenues:
Revenues	31,791	26,302
Gross Profit:
Total Gross Profit	8,838	7,483
Operating Income (Loss):
Total Operating Income	1,259	2,426
Amortization of Intangible Assets	634	176
Life Sciences Europe
Revenues:
Revenues	11,575	10,289
Gross Profit:
Total Gross Profit	4,218	3,832
Operating Income (Loss):
Total Operating Income	1,199	533
Amortization of Intangible Assets	71	160
Corporate Segment
Operating Income (Loss):
Total Operating Income	(12,244)	(10,999)
Amortization of Intangible Assets	$ 8	$ 55

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Acquisitions (Schedule of Intangible Assets Acquired as Part of Business Combination) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended														3 Months Ended
	Mar. 31, 2014 Contractor Relations [Member]	Mar. 31, 2014 Non-compete agreements	Mar. 31, 2014 Computer Software, Intangible Asset [Member]	Dec. 05, 2013 CyberCoders [Member]	Dec. 05, 2013 CyberCoders [Member] Trademarks [Member]	Dec. 05, 2013 CyberCoders [Member] Contractor Relations [Member]	Dec. 05, 2013 CyberCoders [Member] Customer relations	Dec. 05, 2013 CyberCoders [Member] Non-compete agreements	Dec. 05, 2013 CyberCoders [Member] Computer Software, Intangible Asset [Member]	Dec. 02, 2013 Whitaker [Member]	Dec. 02, 2013 Whitaker [Member] Trademarks [Member]	Dec. 02, 2013 Whitaker [Member] Contractor Relations [Member]	Dec. 02, 2013 Whitaker [Member] Customer relations	Dec. 02, 2013 Whitaker [Member] Non-compete agreements	Mar. 31, 2014 Minimum [Member] Customer relations	Mar. 31, 2014 Maximum [Member] Customer relations
Acquired Intangible Assets [Line Items]
Useful life	2 years 6 months	3 years	6 years												3 years	7 years
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill				$ 36,450	$ 12,100	$ 3,900	$ 750	$ 800	$ 18,900	$ 9,760	$ 2,000	$ 1,800	$ 5,900	$ 60

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Acquisitions (Schedule of Purchase Price Allocation) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 05, 2013 CyberCoders [Member]	Dec. 02, 2013 Whitaker [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets	$ 10,583	$ 8,909
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	3,790	272
BusinessCombinationRecognizedGoodwill	70,784	7,452
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	36,450	9,760
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	915	568
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	122,522	26,961
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities	8,057	5,083
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other	15,817	551
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	23,874	5,634
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	$ 98,648	$ 21,327

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Segment Reporting (Revenue by Geographical Areas) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Revenues from External Customers [Line Items]
Revenues	$ 439,274	$ 379,044
Domestic [Member]
Revenues from External Customers [Line Items]
Revenues	418,664	358,648
Foreign [Member]
Revenues from External Customers [Line Items]
Revenues	$ 20,610	$ 20,396

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Acquisitions (Business Acquisition, Pro Forma Information) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Business Acquisition, Pro Forma Information [Abstract]
Business Acquisition, Pro Forma Information, Description	The pro forma financial information gives effect to certain adjustments, including: amortization of intangible assets, interest expense on acquisition-related debt and provision for income taxes. Acquisition-related costs are assumed to have occurred at the beginning of the year prior to acquisition. The pro forma financial information is not necessarily indicative of the operating results that would have occurred if the acquisition had been consummated as of the date indicated, nor are they necessarily indicative of future operating results.
Revenues	$ 400,022
Operating income	11,032
Net income	$ 25,429
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Basic	$ 0.21
Basic earnings per share (in dollars per share)	$ 0.48
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Diluted	$ 0.20
Diluted earnings per share (in dollars per share)	$ 0.47
Weighted average number of shares outstanding	53,046
Weighted average number of shares and dilutive shares outstanding	54,036

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Discontinued Operations Discontinued Operations (Details) (USD $)	0 Months Ended		3 Months Ended
	Dec. 02, 2013	Feb. 12, 2013	Mar. 31, 2014	Mar. 31, 2013
Discontinued Operations and Disposal Groups [Abstract]
Proceeds from Divestiture of Businesses	$ 28,700,000	$ 33,700,000
Gain on sale of discontinued operations, net of income taxes	16,400,000	14,400,000	0	14,412,000
Discontinued Operation, Tax Effect of Income (Loss) from Disposal of Discontinued Operation	10,400,000	9,100,000
Disposal Group, Including Discontinued Operation, Revenue			0	16,581,000
Disposal Group, Including Discontinued Operation, Operating Income (Loss)			(209,000)	131,000
Discontinued Operation, Tax Effect of Discontinued Operation			(78,000)	146,000
Income (loss) from discontinued operations, net of income taxes			$ (131,000)	$ (15,000)

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Accounting Standards Updates (Notes)

3 Months Ended

Mar. 31, 2014

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Accounting Standards Update

Accounting Standards Update.In April 2014, the Financial Accounting Standards Board issued Accounting Standards Update No. 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity ("ASU 2014-08"). ASU 2014-08 amends the definition of a discontinued operation and requires entities to provide additional disclosures for both discontinued operations and disposal transactions that do not meet the discontinued-operations criteria. It is effective for annual periods beginning on or after December 15, 2014. The Company does not expect the adoption of this guidance to have a material effect on its consolidated financial statements.

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Long-Term Debt (Details) (USD $)	0 Months Ended														3 Months Ended	0 Months Ended	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Term-B Loan Facility due May 2020	Feb. 28, 2014 Term-B Loan Facility due May 2020	Dec. 31, 2013 Term-B Loan Facility due May 2020	May 16, 2013 Term-B Loan Facility due May 2020	Mar. 31, 2014 Revolving Credit Facility due May 2018	Dec. 31, 2013 Revolving Credit Facility due May 2018	May 16, 2013 Revolving Credit Facility due May 2018	May 16, 2013 Term A Loans, Term B Loans and Revolving Loans	Mar. 31, 2014 Term-A Loan Facility due May 2018	Feb. 28, 2014 Term-A Loan Facility due May 2018	Dec. 31, 2013 Term-A Loan Facility due May 2018	May 16, 2013 Term-A Loan Facility due May 2018	Mar. 31, 2014 Eurodollar [Member] Term-B Loan Facility due May 2020	Mar. 31, 2014 Maximum [Member]	Mar. 31, 2014 Maximum [Member] Revolving Credit Facility due May 2018	Mar. 31, 2014 Maximum [Member] Eurodollar Rate or Base Rate Revolving Loans and Term A Loans	Mar. 31, 2014 Minimum [Member] Revolving Credit Facility due May 2018	Mar. 31, 2014 Minimum [Member] Eurodollar Rate or Base Rate Revolving Loans and Term A Loans
Debt Disclosure [Abstract]
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year	$ 13,687,000
Long-term Debt, Maturities, Repayments of Principal in Year Two	18,250,000
Long-term Debt, Maturities, Repayments of Principal in Year Three	18,250,000
Long-term Debt, Maturities, Repayments of Principal in Year Four	18,250,000
Long-term Debt, Maturities, Repayments of Principal in Year Five	145,063,000
Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five	180,313,000
Debt Instrument [Line Items]
Senior Secured Debt	393,813,000	399,813,000	180,313,000		262,813,000		41,000,000	44,500,000			172,500,000		92,500,000
Line of Credit Facility, Maximum Borrowing Capacity									125,000,000	500,000,000
Debt Instrument, Face Amount						275,000,000								100,000,000
Proceeds from Issuance of Long-term Debt												82,500,000
Repayments of Long-term Debt				82,500,000
Line of Credit Facility, Increase in Additional Principal Amount										100,000,000
Line of Credit Facility, Remaining Borrowing Capacity							$ 81,000,000
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum															1.00%
Debt Instrument, Basis Spread on Variable Rate															2.50%			2.50%		1.75%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage																	0.40%		0.25%
Debt Instrument, Interest Rate at Period End			3.50%				2.20%				2.20%
Debt, Weighted Average Interest Rate	2.80%
Leverage Ratio	2.12															4.00
Leverage Ratio in Latest Year of Debt Term																3.25
Pledged equity interest in foreign subsidiaries	65.00%

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Incentive Award Plan and Employee Stock Purchase Plan (Compensation Expense) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Allocated Share-based Compensation Expense	$ 3.2	$ 2.5

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CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current Assets:
Cash and cash equivalents	$ 23,394	$ 37,350
Accounts receivable, net of allowance of $4,557 and $3,067, respectively	277,553	262,224
Prepaid expenses	6,383	8,686
Deferred income tax assets	17,205	17,214
Workers' compensation and medical malpractice receivable	20,041	21,200
Other	3,055	3,200
Total current assets	347,631	349,874
Property and equipment, net	40,193	38,591
Goodwill	575,225	574,948
Identifiable intangible assets, net	282,282	288,455
Other	9,073	9,326
Total Assets	1,254,404	1,261,194
Current Liabilities:
Current portion of long-term debt	18,250	10,000
Accounts payable	5,687	8,370
Accrued payroll and contract professional pay	77,377	76,556
Workers’ compensation and medical malpractice loss reserves	31,808	32,751
Income taxes payable	978	13,418
Other	23,068	27,926
Total current liabilities	157,168	169,021
Deferred income tax liabilities	49,559	49,584
Long-term debt	375,563	389,813
Other long-term liabilities	11,600	12,643
Total liabilities	593,890	621,061
Commitments and Contingencies
Stockholders’ Equity:
Preferred Stock, $0.01 par value, 1,000,000 shares authorized, no shares issued	0	0
Common Stock, $0.01 par value, 75,000,000 shares authorized, 54,318,986 and 53,926,525 issued and outstanding, respectively	543	539
Paid-in capital	499,739	493,279
Retained earnings	160,116	146,199
Accumulated other comprehensive income	116	116
Total stockholders’ equity	660,514	640,133
Total Liabilities and Stockholders’ Equity	$ 1,254,404	$ 1,261,194

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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash Flows from Operating Activities:
Net income	$ 13,917	$ 24,613
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Gain on sale of discontinued operations, net of income taxes	0	(14,412)
Depreciation and amortization	8,959	7,244
Stock-based compensation	3,190	2,724
Gross excess tax benefits from stock-based compensation	(2,088)	(768)
Workers’ compensation and medical malpractice provision	1,592	1,288
Other	2,029	502
Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
Accounts receivable	(16,476)	(26,113)
Prepaid expenses and income taxes	3,950	2,151
Accounts payable	(3,006)	(1,089)
Accrued payroll and contract professional pay	599	7,203
Income taxes payable	(12,445)	2,431
Deferred compensation	(20)	(4,850)
Other	(4,522)	2,651
Net cash provided by (used in) operating activities	(4,321)	3,575
Cash Flows from Investing Activities:
Cash paid for property and equipment	4,020	2,785
Cash received from sale of discontinued operations, net	0	28,893
Cash paid for acquisitions, net of cash acquired	(222)	0
Other	352	(1,689)
Net cash provided by (used in) investing activities	(3,890)	24,419
Cash Flows from Financing Activities:
Principal payments of long-term debt	(105,500)	(43,000)
Proceeds from Issuance of Long-term Debt	99,500	0
Proceeds from stock transactions	2,967	2,443
Payments of employment taxes related to release of restricted stock awards	(3,277)	(3,611)
Gross excess tax benefits from stock-based compensation	2,088	768
Other	(1,137)	(20)
Net cash used in financing activities	(5,359)	(43,420)
Effect of exchange rate changes on cash and cash equivalents	(386)	(279)
Net Increase in Cash and Cash Equivalents	(13,956)	(15,705)
Cash and Cash Equivalents at Beginning of Year	37,350	27,479
Cash and Cash Equivalents at End of Period	23,394	11,774
Supplemental Disclosure of Cash Flow Information:
Income taxes	21,034	3,861
Interest	3,087	4,673
Supplemental Disclosure of Non-Cash Transactions:
Acquisition of property and equipment through accounts payable	$ 870	$ 819

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Fair Value Measurements (Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation) (Details) (Contingent Consideration Liability, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Contingent Consideration Liability
Contingent consideration for acquisitions
Balance at beginning of period	$ (8,527)	$ (7,577)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Payments	691	0
Fair value adjustment	0	830
Foreign currency translation adjustment	(24)	203
Balance at end of period	$ (7,860)	$ (6,544)

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Long-Term Debt (Tables)

3 Months Ended

Mar. 31, 2014

Debt Disclosure [Abstract]

Schedule of Long-term Debt

Long-term debt consisted of the following at March 31, 2014 and December 31, 2013(in thousands):

	2014		2013
Senior Secured Debt
Revolving credit facility, due May 2018	$	41,000	$	44,500
Term A loan facility, due May 2018	172,500		92,500
Term B loan facility, due May 2020	180,313		262,813
	$	393,813	$	399,813

Contractual Obligation, Fiscal Year Maturity Schedule [Table Text Block]

During the remainder of this fiscal year, each of the next four years and thereafter, the Company will be required to make payments as follows (in thousands):

2014	$	13,687
2015	18,250
2016	18,250
2017	18,250
2018	145,063
Thereafter	180,313
	$	393,813

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Goodwill and Identifiable Assets (Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Goodwill [Roll Forward]
Gross goodwill	$ 575,225	$ 574,948	$ 617,875
Accumulated impairment loss	0	0	(121,717)
Goodwill	575,225	574,948	496,158
Goodwill, Written off Related to Sale of Business Unit		(121,717)
Write-off of accum impairment loss related to sale of business unit		121,717
Translation adjustment	20	811
Apex
Goodwill [Roll Forward]
Gross goodwill	289,712	289,712	289,712
Accumulated impairment loss	0	0	0
Goodwill	289,712	289,712	289,712
Translation adjustment	0	0
Oxford
Goodwill [Roll Forward]
Gross goodwill	221,916	221,659	150,619
Accumulated impairment loss	0	0	0
Goodwill	221,916	221,659	150,619
Goodwill, Other Changes		513
Translation adjustment	0	0
Physician
Goodwill [Roll Forward]
Gross goodwill	59,013	59,013	51,561
Accumulated impairment loss	0	0	0
Goodwill	59,013	59,013	51,561
Translation adjustment	0	0
Life Sciences Europe
Goodwill [Roll Forward]
Gross goodwill	4,584	4,564	3,753
Accumulated impairment loss	0	0	0
Goodwill	4,584	4,564	3,753
Translation adjustment	20	811
Healthcare Segment
Goodwill [Roll Forward]
Gross goodwill	0	0	122,230
Accumulated impairment loss	0	0	(121,717)
Goodwill	0	0	513
Goodwill, Written off Related to Sale of Business Unit		(121,717)
Write-off of accum impairment loss related to sale of business unit		121,717
Goodwill, Other Changes		(513)
Translation adjustment	0	0
CyberCoders [Member]
Goodwill [Roll Forward]
Acquisition		70,527
Goodwill, Purchase Accounting Adjustments	257
CyberCoders [Member] | Oxford
Goodwill [Roll Forward]
Acquisition		70,527
Goodwill, Purchase Accounting Adjustments	257
Whitaker [Member]
Goodwill [Roll Forward]
Acquisition		7,452
Whitaker [Member] | Physician
Goodwill [Roll Forward]
Acquisition		$ 7,452

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Goodwill and Identifiable Assets (Tables)

3 Months Ended

Mar. 31, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The changes in the carrying amount of goodwill for the year endedDecember 31, 2013and thethree months endedMarch 31, 2014were as follows (in thousands):

	Apex		Oxford		Physician		Life Sciences Europe		Healthcare			Total
Balance as of December 31, 2012
Gross goodwill	$	289,712	$	150,619	$	51,561	$	3,753	$	122,230		$	617,875
Accumulated impairment loss	—		—		—		—		(121,717		)	(121,717		)
	289,712		150,619		51,561		3,753		513			496,158
Whitaker Acquisition (see Note 3)	—		—		7,452		—		—			7,452
CyberCoders Acquisition (see Note 3)	—		70,527		—		—		—			70,527
Divestiture - gross goodwill	—		—		—		—		(121,717		)	(121,717		)
Divestiture - accumulated impairment loss	—		—		—		—		121,717			121,717
Transfers	—		513		—		—		(513		)	—
Translation adjustment	—		—		—		811		—			811
Balance as of December 31, 2013
Gross goodwill	289,712		221,659		59,013		4,564		—			574,948
Accumulated impairment loss	—		—		—		—		—			—
	289,712		221,659		59,013		4,564		—			574,948
Acquisition accounting	—		257		—		—		—			257
Translation adjustment	—		—		—		20		—			20
Balance as of March 31, 2014
Gross goodwill	289,712		221,916		59,013		4,584		—			575,225
Accumulated impairment loss	—		—		—		—		—			—
	$	289,712	$	221,916	$	59,013	$	4,584	$	—		$	575,225

Schedule of Acquired Intangible Assets

As of March 31, 2014 and December 31, 2013, the Company had the following acquired intangible assets (in thousands):

		2014						2013
	Estimated Useful Life	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Intangible assets subject to amortization:
Customer relations	3 months – 10 years	$	110,007	$	45,633	$	64,374	$	110,007	$	41,564	$	68,443
Contractor relations	2 - 7 years	43,598		31,907		11,691		43,598		30,737		12,861
Non-compete agreements	2 - 7 years	3,863		1,570		2,293		3,863		1,424		2,439
In-use software	6 years	18,900		1,051		17,849		18,900		263		18,637
		176,368		80,161		96,207		176,368		73,988		102,380
Intangible assets not subject to amortization:
Trademarks		186,075		—		186,075		186,075		—		186,075
Goodwill		575,225		—		575,225		574,948		—		574,948
Total		$	937,668	$	80,161	$	857,507	$	937,391	$	73,988	$	863,403

Schedule of Estimated Future Amortization Expense

Estimated amortization for the remainder of this fiscal year, each of the next four fiscal years and thereafter follows (in thousands):

2014	$	18,339
2015	21,326
2016	17,720
2017	12,887
2018	10,306
Thereafter	15,629
	$	96,207

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Financial Statement Presentation

3 Months Ended

Mar. 31, 2014

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Financial Statement Presentation

Financial Statement Presentation. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America for interim financial information, the instructions to Form 10-Q and Regulation S-X. Accordingly, they do not include all of the information and footnotes required by accounting principles generally accepted in the United States of America for complete financial statements. The financial statements include adjustments consisting of normal recurring items, which, in the opinion of management, are necessary for a fair presentation of the financial position of On Assignment, Inc. and its subsidiaries (the "Company") and its results of operations for the interim dates and periods set forth herein. The results for the three months endedMarch 31, 2014 are not necessarily indicative of the results to be expected for the full year or any other period. This Quarterly Report on Form 10-Q should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2013.

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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current Assets:
Accounts receivable, allowance	$ 4,557	$ 3,067
Stockholders’ Equity:
Preferred Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred Stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred Stock, shares issued (in shares)	0	0
Preferred Stock, shares outstanding (in shares)	0	0
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, shares authorized (in shares)	75,000,000	75,000,000
Common Stock, shares issued (in shares)	54,318,986	53,926,525
Common Stock: shares outstanding (in shares)	54,318,986	53,926,525

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Income Taxes

3 Months Ended

Mar. 31, 2014

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes. For interim reporting periods, the Company prepares an estimate of the full-year income and the related income tax expense for each jurisdiction in which the Company operates. Changes in the geographical mix, permanent differences or estimated level of annual pretax income can impact the Company’s actual effective rate.

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Document and Entity Information	3 Months Ended
	Mar. 31, 2014	May 02, 2014
Entity Information [Line Items]
Entity Registrant Name	ON ASSIGNMENT INC
Entity Central Index Key	0000890564
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2014
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		54,327,203

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Segment Reporting

3 Months Ended

Mar. 31, 2014

Segment Reporting [Abstract]

Segment Reporting

Segment Reporting.The Company has four reportable segments: Apex, Oxford, Physician, and Life Sciences Europe. During the quarter ended March 31, 2014, the Company underwent a restructuring that realigned the former Life Sciences segment. As a result of this realignment, Lab Support U.S. is now included in the Apex segment; Valesta U.S. is now included in the Oxford segment; and the Life Sciences Europe segment includes Lab Support Europe, Valesta Europe, and Sharpstream. During 2013, the Company sold its Nurse Travel line of business and most of the Allied Healthcare line of business. See Note 4 Discontinued Operations for further information. The divestitures resulted in changes to the internal reporting package reviewed by the Chief Operating Decision Maker ("CODM"), and the Healthcare segment no longer exists. Health Information Management, formerly included in the Healthcare Segment, is included in the Oxford Segment and unallocated corporate expenses are separately disclosed in order to align with the revised internal reporting package reviewed by the CODM. All prior periods have been retrospectively restated to conform to the current presentation.

The Company’s management evaluates the performance of each segment primarily based on revenues, gross profit, and operating income. The information in the following table is derived directly from the segments’ internal financial reporting used for corporate management purposes. The Company's management does not evaluate, manage or measure performance of segments using asset information, and such information is not readily available. Accordingly, assets by reportable segment are not disclosed.

The following tables present revenues, gross profit, operating income and amortization by reportable segment for the three months endedMarch 31, 2014 and 2013 (in thousands):

2014:	Apex		Oxford		Physician		Life Sciences Europe		Corporate			Total
Revenues	$	278,408	$	117,500	$	31,791	$	11,575	$	—		$	439,274
Gross profit	75,506		49,026		8,838		4,218		—			137,588
Operating income	22,784		14,284		1,259		1,199		(12,244		)	27,282
Amortization	4,089		1,370		634		71		8			6,172

2013:	Apex		Oxford		Physician		Life Sciences Europe		Corporate			Total
Revenues	$	239,765	$	102,688	$	26,302	$	10,289	$	—		$	379,044
Gross profit	63,981		34,815		7,483		3,832		—			110,111
Operating income	17,229		13,666		2,426		533		(10,999		)	22,855
Amortization	4,881		107		176		160		55			5,379

The Company operates internationally, with operations mainly in the United States, Europe, Canada, Australia and New Zealand. The following table presents domestic and foreign revenues (in thousands):

	Three Months Ended
	March 31,
	2014		2013
Revenues:
Domestic	$	418,664	$	358,648
Foreign	20,610		20,396
	$	439,274	$	379,044

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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Revenues	$ 439,274	$ 379,044
Cost of services	301,686	268,933
Gross profit	137,588	110,111
Selling, general and administrative expenses	104,134	81,877
Amortization of intangible assets	6,172	5,379
Operating income	27,282	22,855
Interest expense, net	(3,328)	(5,096)
Income before income taxes	23,954	17,759
Provision for income taxes	9,906	7,543
Income from continuing operations	14,048	10,216
Gain on sale of discontinued operations, net of income taxes	0	14,412
Loss from discontinued operations, net of income taxes	(131)	(15)
Net income	13,917	24,613
Basic earnings per common share:
Income from continuing operations	$ 0.26	$ 0.19
Income (loss) from discontinued operations	$ 0.00	$ 0.27
Net Income	$ 0.26	$ 0.46
Diluted earnings per common share:
Income from continuing operations	$ 0.26	$ 0.19
Income (loss) from discontinued operations	$ (0.01)	$ 0.27
Net Income	$ 0.25	$ 0.46
Number of shares and share equivalents used to calculate earnings per share:
Basic	54,104	53,046
Diluted	54,975	54,036
Reconciliation of net income to comprehensive income:
Net income	13,917	24,613
Changes in fair value of derivatives, net of tax of $9 and $28, respectively.	44	67
Foreign currency translation adjustment, net of tax	(44)	(1,259)
Comprehensive income	$ 13,917	$ 23,421

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Fair Value Measurements

3 Months Ended

Mar. 31, 2014

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements. The recorded values of cash and cash equivalents, accounts receivable, accounts payable and accrued expenses approximate their fair value based on their short-term nature. Long-term debt recorded in the Company’s Condensed Consolidated Balance Sheet atMarch 31, 2014was$393.8 million. The fair value of the long-term debt, determined using the quoted price technique based on Level 2 inputs including the yields of comparable companies with similar credit characteristics, was $393.3 million.

The Company has obligations, to be paid in cash, to the former owners of CyberCoders and Whitaker, if certain future financial goals are met. The fair value of this contingent consideration is determined using an expected present value technique. Expected cash flows are determined using the probability - weighted average of possible outcomes that would occur should certain financial metrics be reached. There is no market data available to use in valuing the contingent consideration, therefore, the Company developed its own assumptions related to the future financial performance of the businesses to evaluate the fair value of these liabilities. As such, the contingent consideration is classified within Level 3.

In connection with estimating the fair value of the contingent consideration, the Company develops various scenarios (base case, downside case, and upside case) and weights each according to the probability of occurrence. The probabilities range from 10.0 percent to 60.0 percent, with the most significant weighting given to the base case at 60 percent for Whitaker and 50 percent for CyberCoders. These scenarios are developed based on the expected financial performance of the acquired companies, with revenue growth rates being a primary input to the calculation. These revenue growth rates range from 2.0 percent to 15.0 percent for Whitaker, and from 9.6 percent to 25.0 percent for CyberCoders. An increase or decrease in the probability of achievement of any of these scenarios could result in a significant increase or decrease to the estimated fair value.

The fair value is reviewed on a quarterly basis based on the most recent financial performance of the most recent fiscal quarter. An analysis is performed at the end of each fiscal quarter to compare actual results to forecasted financial performance. If performance has deviated from projected levels, the valuation is updated for the latest information available.

The significant assumptions that may materially affect the fair value are developed in conjunction with the guidance of subsidiary management to ensure that the most accurate and latest financial projections are used and compared with the most recent financial results in the fair value measurement.

The liability for contingent consideration is established at the time of the acquisition and is evaluated quarterly. The current liability is included in the Condensed Consolidated Balance Sheets in other and the non-current portion is included in other long-term liabilities. Fair value adjustments are included in the Condensed Consolidated Statements of Operations and Comprehensive Income in selling, general and administrative expenses.

The contingent consideration obligations measured at fair value on a recurring basis follow (in thousands):

	As of March 31, 2014
	Fair Value Measurements Using							Total
	Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	(Level 1)		(Level 2)		(Level 3)
Contingent consideration	$	—	$	—	$	(7,860	)	$	(7,860	)
	As of December 31, 2013
	Fair Value Measurements Using							Total
	Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	(Level 1)		(Level 2)		(Level 3)
Contingent consideration	$	—	$	—	$	(8,527	)	$	(8,527	)

Reconciliations of liabilities measured and carried at fair value on a recurring basis with the use of significant unobservable inputs (Level 3) are as follows (in thousands):

	Three Months Ended
	March 31,
	2014			2013
Contingent consideration
Balance at beginning of period	$	(8,527	)	$	(7,577	)
Payments on contingent consideration	691			—
Fair value adjustment	—			830
Foreign currency translation adjustment	(24		)	203
Balance at end of period	$	(7,860	)	$	(6,544	)

Certain assets and liabilities, such as goodwill, are not measured at fair value on an ongoing basis but are subject to fair value adjustments in certain circumstances (e.g., when there is evidence of impairment). For the three months ended March 31, 2014, no fair value adjustments were required for non-financial assets or liabilities

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Long-Term Debt

3 Months Ended

Mar. 31, 2014

Debt Disclosure [Abstract]

Long-Term Debt

Long-Term Debt.Long-term debt consisted of the following at March 31, 2014 and December 31, 2013(in thousands):

	2014		2013
Senior Secured Debt
Revolving credit facility, due May 2018	$	41,000	$	44,500
Term A loan facility, due May 2018	172,500		92,500
Term B loan facility, due May 2020	180,313		262,813
	$	393,813	$	399,813

On May 16, 2013, the Company entered into a new $500.0 million credit facility and repaid all borrowing under the old facility. The facility initially consisted of (i) a $100.0 million, five-year term A loan facility, (ii) a $275.0 million seven-year term B loan facility and (iii) a $125.0 million, five-year revolving loan facility. On February 28, 2014, the Company increased the term A loan facility by $82.5 million and repaid $82.5 million on the term B loan facility. Under terms of the credit facility, the Company has the ability to increase the loan facilities by up to $100.0 million under certain specified conditions.

Borrowings under the facility bear interest at the Company's option, at either the Eurodollar rate (LIBOR) or the base rate, plus 1.75 percent to 2.50 percent for the term A loan facility and revolving loans and LIBOR, with a floor of 1.0 percent, plus 2.50 percent for the term B loan facility. The commitment fee on the undrawn portion available under the revolving loan facility ranges from 0.25 percent to 0.40 percent.

At March 31, 2014, borrowings on the term A loan facility bore interest at 2.2 percent, and borrowings on the term B loan facility bore interest at 3.5 percent. The revolving credit facility bore interest at 2.2 percent. The weighted average interest rate at March 31, 2014 was 2.8 percent.

During the remainder of this fiscal year, each of the next four years and thereafter, the Company will be required to make payments as follows (in thousands):

2014	$	13,687
2015	18,250
2016	18,250
2017	18,250
2018	145,063
Thereafter	180,313
	$	393,813

The Company is also required to make mandatory prepayments of loans under the facility, subject to specified exceptions, from excess cash flow and the proceeds of asset sales, debt issuances and specified other events.

The Company's obligations under the credit facility are guaranteed by substantially all of its direct and indirect domestic subsidiaries and secured by a lien on substantially all of the Company's tangible and intangible property and by a pledge of: (i) all of the equity interests in its direct and indirect domestic subsidiaries; and (ii) approximately 65 percent of the equity interests in its first-tier foreign subsidiaries.

In addition to other covenants, the maximum ratio of consolidated funded debt to consolidated EBITDA steps down from 4.00:1.00 as of March 31, 2014 to 3.25:1.00 by June 30, 2015. There are also limits on the Company's and its subsidiaries' ability to: incur liens, incur additional indebtedness, make loans and investments, engage in mergers and acquisitions, engage in asset sales, declare dividends or redeem or repurchase capital stock, alter the business conducted by the Company and its subsidiaries, transact with affiliates, prepay, redeem or purchase subordinated debt and amend or otherwise alter debt agreements.

As of March 31, 2014 and December 31, 2013, the Company was in compliance with all of its debt covenants. As of March 31, 2014, the Company had a ratio of funded debt to consolidated EBITDA of 2.12:1.00 and had $81.0 million of borrowings available under the revolving credit facility.

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Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2014

Fair Value Disclosures [Abstract]

Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis

The contingent consideration obligations measured at fair value on a recurring basis follow (in thousands):

	As of March 31, 2014
	Fair Value Measurements Using							Total
	Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	(Level 1)		(Level 2)		(Level 3)
Contingent consideration	$	—	$	—	$	(7,860	)	$	(7,860	)
	As of December 31, 2013
	Fair Value Measurements Using							Total
	Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	(Level 1)		(Level 2)		(Level 3)
Contingent consideration	$	—	$	—	$	(8,527	)	$	(8,527	)

Schedule of Reconciliations of Liabilities Measured and Carried at Fair Value on Recurring Basis, with Significant Unobservable Inputs

Reconciliations of liabilities measured and carried at fair value on a recurring basis with the use of significant unobservable inputs (Level 3) are as follows (in thousands):

	Three Months Ended
	March 31,
	2014			2013
Contingent consideration
Balance at beginning of period	$	(8,527	)	$	(7,577	)
Payments on contingent consideration	691			—
Fair value adjustment	—			830
Foreign currency translation adjustment	(24		)	203
Balance at end of period	$	(7,860	)	$	(6,544	)

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Fair Value Measurements (Policies)

3 Months Ended

Mar. 31, 2014

Fair Value Disclosures [Abstract]

Fair Value of Financial Instruments, Policy [Policy Text Block]

 The recorded values of cash and cash equivalents, accounts receivable, accounts payable and accrued expenses approximate their fair value based on their short-term nature. Long-term debt recorded in the Company’s Condensed Consolidated Balance Sheet atMarch 31, 2014was$393.8 million. The fair value of the long-term debt, determined using the quoted price technique based on Level 2 inputs including the yields of comparable companies with similar credit characteristics, was $393.3 million.

Fair Value of Contingent Consideration

In connection with estimating the fair value of the contingent consideration, the Company develops various scenarios (base case, downside case, and upside case) and weights each according to the probability of occurrence. The probabilities range from 10.0 percent to 60.0 percent, with the most significant weighting given to the base case at 60 percent for Whitaker and 50 percent for CyberCoders. These scenarios are developed based on the expected financial performance of the acquired companies, with revenue growth rates being a primary input to the calculation. These revenue growth rates range from 2.0 percent to 15.0 percent for Whitaker, and from 9.6 percent to 25.0 percent for CyberCoders. An increase or decrease in the probability of achievement of any of these scenarios could result in a significant increase or decrease to the estimated fair value.

The fair value is reviewed on a quarterly basis based on the most recent financial performance of the most recent fiscal quarter. An analysis is performed at the end of each fiscal quarter to compare actual results to forecasted financial performance. If performance has deviated from projected levels, the valuation is updated for the latest information available.

The significant assumptions that may materially affect the fair value are developed in conjunction with the guidance of subsidiary management to ensure that the most accurate and latest financial projections are used and compared with the most recent financial results in the fair value measurement.

The liability for contingent consideration is established at the time of the acquisition and is evaluated quarterly. The current liability is included in the Condensed Consolidated Balance Sheets in other and the non-current portion is included in other long-term liabilities. Fair value adjustments are included in the Condensed Consolidated Statements of Operations and Comprehensive Income in selling, general and administrative expenses.

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Commitments and Contingencies

3 Months Ended

Mar. 31, 2014

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies.

The Company carries large retention policies for its workers’ compensation liability and its medical malpractice exposures. The workers' compensation and medical malpractice loss reserves are based upon an actuarial report obtained from a third party and determined based on claims filed and claims incurred but not reported. The Company accounts for claims incurred but not yet reported based on estimates derived from historical claims experience and current trends of industry data. Changes in estimates, differences in estimates, and actual payments for claims, are recognized in the period that the estimates changed or the payments were made. The workers' compensation and medical malpractice loss reserves were approximately $11.8 million and $11.6 million, net of anticipated insurance and indemnification recoveries of $20.0 million and $21.2 million, at March 31, 2014 and December 31, 2013, respectively. Included in these amounts is one claim related to our discontinued operations for $11.0 million and $11.1 million, as of March 31, 2014 and December 31, 2013, respectively. This claim is above the Company’s retention amount and will be recovered from the insurance company.

The Company has unused stand-by letters of credit outstanding to secure obligations for workers’ compensation claims with various insurance carriers. The unused stand-by letters of credit at March 31, 2014 and December 31, 2013 were $3.0 million and $2.7 million, respectively.

The Company is subject to contingent consideration agreements entered into in connection with certain of its acquisitions. If the acquired businessesmeet predetermined targets, the Company is obligated to make additional cash payments in accordance with the terms of such contingent consideration agreements. As of March 31, 2014, the Company has potential future contingent consideration of $16.0 million through 2015.

The Company has entered into various non-cancelable operating leases, primarily related to its facilities and certain office equipment used in the ordinary course of business. The Company leases two properties owned by related parties.

At March 31, 2014 and December 31, 2013, the Company has an income tax reserve in other long-term liabilities related to uncertain tax positions of $1.6 million. The Company is unable to make reasonably reliable estimates of the period of cash settlement since the statute of limitations might expire without examination by the respective tax authority.

The Company is involved in various legal proceedings, claims and litigation arising in the ordinary course of business. The Company has accrued approximately $2.1 million for a settlement, inclusive of all plaintiffs’ costs and legal expenses, to resolve an alleged class action dispute regarding the payment of certain of our nurses when the Company owned a Nurse Travel division from 2008 to 2013. Based on the facts currently available, the Company does not believe that the disposition of matters that are pending or asserted will have a material effect on its consolidated financial statements.

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Goodwill and Identifiable Assets

3 Months Ended

Mar. 31, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Identifiable Intangible Assets

Goodwill and Identifiable Intangible Assets. During the quarter ended March 31, 2014, the Company underwent a restructuring resulting in a change in the Company's reportable segments. The goodwill related to the former Life Sciences segment has been allocated to the respective segments below based upon the relative fair value of each component of the former Life Sciences segment. All prior periods have been retrospectively restated to conform to the current presentation. See Note 12 Segment Reporting for further information.The changes in the carrying amount of goodwill for the year endedDecember 31, 2013and thethree months endedMarch 31, 2014were as follows (in thousands):

	Apex		Oxford		Physician		Life Sciences Europe		Healthcare			Total
Balance as of December 31, 2012
Gross goodwill	$	289,712	$	150,619	$	51,561	$	3,753	$	122,230		$	617,875
Accumulated impairment loss	—		—		—		—		(121,717		)	(121,717		)
	289,712		150,619		51,561		3,753		513			496,158
Whitaker Acquisition (see Note 3)	—		—		7,452		—		—			7,452
CyberCoders Acquisition (see Note 3)	—		70,527		—		—		—			70,527
Divestiture - gross goodwill	—		—		—		—		(121,717		)	(121,717		)
Divestiture - accumulated impairment loss	—		—		—		—		121,717			121,717
Transfers	—		513		—		—		(513		)	—
Translation adjustment	—		—		—		811		—			811
Balance as of December 31, 2013
Gross goodwill	289,712		221,659		59,013		4,564		—			574,948
Accumulated impairment loss	—		—		—		—		—			—
	289,712		221,659		59,013		4,564		—			574,948
Acquisition accounting	—		257		—		—		—			257
Translation adjustment	—		—		—		20		—			20
Balance as of March 31, 2014
Gross goodwill	289,712		221,916		59,013		4,584		—			575,225
Accumulated impairment loss	—		—		—		—		—			—
	$	289,712	$	221,916	$	59,013	$	4,584	$	—		$	575,225

As of March 31, 2014 and December 31, 2013, the Company had the following acquired intangible assets (in thousands):

		2014						2013
	Estimated Useful Life	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Intangible assets subject to amortization:
Customer relations	3 months – 10 years	$	110,007	$	45,633	$	64,374	$	110,007	$	41,564	$	68,443
Contractor relations	2 - 7 years	43,598		31,907		11,691		43,598		30,737		12,861
Non-compete agreements	2 - 7 years	3,863		1,570		2,293		3,863		1,424		2,439
In-use software	6 years	18,900		1,051		17,849		18,900		263		18,637
		176,368		80,161		96,207		176,368		73,988		102,380
Intangible assets not subject to amortization:
Trademarks		186,075		—		186,075		186,075		—		186,075
Goodwill		575,225		—		575,225		574,948		—		574,948
Total		$	937,668	$	80,161	$	857,507	$	937,391	$	73,988	$	863,403

Amortization expense for intangible assets with finite lives was $6.2 million and $5.4 million for the three months endedMarch 31, 2014 and 2013, respectively. Estimated amortization for the remainder of this fiscal year, each of the next four fiscal years and thereafter follows (in thousands):

2014	$	18,339
2015	21,326
2016	17,720
2017	12,887
2018	10,306
Thereafter	15,629
	$	96,207

Goodwill and other intangible assets having an indefinite useful life are not amortized for financial statement purposes. Goodwill and intangible assets with indefinite lives are reviewed for impairment on an annual basis on October 31 and whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. There were no triggering events that required an interim impairment analysis during the current period.

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Incentive Award Plan and Employee Stock Purchase Plan

3 Months Ended

Mar. 31, 2014

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

Incentive Award Plan and Employee Stock Purchase Plan

Incentive Award Plan and Employee Stock Purchase Plan.On January 2, 2014, the Chief Executive Officer (the "CEO") was awarded 23,255 performance-based restricted stock units ("RSUs") with a grant date fair market value of $0.8 million, which will vest on January 4, 2015, contingent upon the Company achieving certain financial performance objectives based on Adjusted EBITDA (earnings before interest, taxes, depreciation, and amortization of identifiable intangible assets, but excluding gains, losses or expenses associated with unusual items such as equity-based compensation expense, impairment charges and acquisition, integration and strategic planning expenses) during 2014. OnMarch 26, 2014, the CEO was awarded91,569performance-based RSUs with a grant date fair market value of$3.3 million, which will vest inthreeequal annual increments on January 4, 2015, January 4, 2016 and January 4, 2017, contingent upon the Company achieving certain financial performance objectives based on Adjusted EBITDA during 2014. OnMarch 26, 2014, the CEO was awarded a performance-based award which had a grant date fair market value of $0.5 million, which will vest on January 2, 2015, contingent upon the Company meeting certain financial performance objectives during 2014. The Company classifies this award as a liability award until the number of shares is determined on the settlement date, by dividing $0.5 million by the closing price of the Company’s stock on the settlement date. The grant date fair market value of the RSUs described in this paragraph is expensed over the vesting term, based on an estimate of the percentage achievement of the applicable performance targets. All awards are subject to the CEO’s continued employment through applicable vesting dates. All awards may vest on an accelerated basis in part or in full upon the occurrence of certain events.

On March 26, 2014, the Company granted 27,141 performance-based RSUs to certain other executive officers with an aggregate grant date fair value of $1.0 million, which will vest on January 2, 2015, subject to continued employment and the Company attaining certain performance objectives during 2014, as approved by the Compensation Committee. Compensation expense for the performance-based component of these awards is recognized over the vesting period, based on an estimate of the percentage achievement of the targets for these awards.

On March 26, 2014, the Company granted 60,244 performance-based RSU grants to certain Apex employees with an aggregate grant date fair value of $2.2 million, which vest, if the performance objective is attained, in 12 equal installments beginning on April 1, 2015 and quarterly thereafter, subject to continued employment through each vesting date. Compensation expense for the performance-based component of these awards is recognized over the vesting period, based on an estimate of the percentage achievement of the targets for these awards.

On March 31, 2014, the Company issued 90,837 sharesof common stock under the On Assignment 2010 Employee Stock Purchase Plan (the "ESPP"). 

Compensation expense related to stock-based compensation, including the ESPP, was $3.2 million and $2.5 million for the three months endedMarch 31, 2014 and 2013, respectively. Stock-based compensation is included in the Condensed Consolidated Statements of Operations and Comprehensive Income in selling, general and administrative expenses. 

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Earnings per share

3 Months Ended

Mar. 31, 2014

Earnings Per Share [Abstract]

Earnings per share

Earnings per share.Basic earnings per share are computed based upon the weighted average number of common shares outstanding. Diluted earnings per share are computed based upon the weighted average number of common shares outstanding and dilutive common share equivalents (consisting of incentive stock options, non-qualified stock options and restricted stock awards and units and employee stock purchase plan shares) outstanding during the periods using the treasury stock method.

The following is a reconciliation of the shares used to compute basic and diluted earnings per share (in thousands):

	Three Months Ended
	March 31,
	2014	2013
Weighted average number of common shares outstanding used to compute basic earnings per share	54,104	53,046
Dilutive effect of stock-based awards	871	990
Number of shares used to compute diluted earnings per share	54,975	54,036

There were 10,000 and 77,000 weighted average share equivalents outstanding during the three months endedMarch 31, 2014 and 2013, respectively, that were excluded from the computation of diluted earnings per share because the exercise price for these options was greater than the average market price of the Company’s shares of common stock during the respective periods that became anti-dilutive when applying the treasury stock method.

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Fair Value Measurements (Recurring Basis) (Details) (Recurring Basis, USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Contingent consideration to be paid in cash for the acquisitions	$ 0	$ 0
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Contingent consideration to be paid in cash for the acquisitions	0	0
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Contingent consideration to be paid in cash for the acquisitions	(7,860)	(8,527)
Total Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Contingent consideration to be paid in cash for the acquisitions	$ (7,860)	$ (8,527)

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Discontinued Operations Discontinued Operations (Tables)

3 Months Ended

Mar. 31, 2014

Discontinued Operations and Disposal Groups [Abstract]

Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures [Table Text Block]

The following is a summary of Allied Healthcare's and Nurse Travel's combined operating results for the three months ended March 31, 2014 and March 31, 2013, respectively (in thousands):

	2014			2013
Revenues	$	—		$	16,581
Income (loss) before income taxes	$	(209	)	$	131
Provision (benefit) for income taxes	$	(78	)	$	146
Net loss	$	(131	)	$	(15	)

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Segment Reporting (Tables)

3 Months Ended

Mar. 31, 2014

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

The following tables present revenues, gross profit, operating income and amortization by reportable segment for the three months endedMarch 31, 2014 and 2013 (in thousands):

2014:	Apex		Oxford		Physician		Life Sciences Europe		Corporate			Total
Revenues	$	278,408	$	117,500	$	31,791	$	11,575	$	—		$	439,274
Gross profit	75,506		49,026		8,838		4,218		—			137,588
Operating income	22,784		14,284		1,259		1,199		(12,244		)	27,282
Amortization	4,089		1,370		634		71		8			6,172

2013:	Apex		Oxford		Physician		Life Sciences Europe		Corporate			Total
Revenues	$	239,765	$	102,688	$	26,302	$	10,289	$	—		$	379,044
Gross profit	63,981		34,815		7,483		3,832		—			110,111
Operating income	17,229		13,666		2,426		533		(10,999		)	22,855
Amortization	4,881		107		176		160		55			5,379

Schedule of Revenue by Geographical Areas

The Company operates internationally, with operations mainly in the United States, Europe, Canada, Australia and New Zealand. The following table presents domestic and foreign revenues (in thousands):

	Three Months Ended
	March 31,
	2014		2013
Revenues:
Domestic	$	418,664	$	358,648
Foreign	20,610		20,396
	$	439,274	$	379,044

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Commitments and Contingencies (Details) (USD $)	Mar. 31, 2014 property	Dec. 31, 2013
Other Commitments [Line Items]
Workers' Compensation and Medical Malpractice Receivable, Current	$ 20,041,000	$ 21,200,000
Self Insurance Reserve	11,800,000	11,600,000
Letters of Credit Outstanding, Amount	3,000,000	2,700,000
Contingent consideration maximum	16,000,000
Liability for Uncertain Tax Positions, Noncurrent	1,600,000	1,600,000
Other	23,068,000	27,926,000
Number of Leased Properties Owned by Related Parties	2
Discontinued Operations [Member]
Other Commitments [Line Items]
Workers' Compensation and Medical Malpractice Receivable, Current	11,000,000	11,100,000
Pending Litigation [Member] | Discontinued Operations [Member]
Other Commitments [Line Items]
Other	$ 2,100,000

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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Changes in fair value of derivative, tax	$ 9	$ 28

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Discontinued Operations Discontinued Operations

3 Months Ended

Mar. 31, 2014

Discontinued Operations and Disposal Groups [Abstract]

Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]

Discontinued Operations. On December 2, 2013, the Company completed the sale of its Allied Healthcare division for $28.7 million in cash and recognized a gain of $16.4 million, net of income taxes of $10.4 million. The Allied Healthcare division, previously included in the Healthcare segment, has been presented as discontinued operations in the Condensed Consolidated Statements of Operations for all periods presented.

On February 12, 2013, the Company completed the sale of the Nurse Travel division for $33.7 million in cash and recognized a gain of $14.4 million, net of income taxes of $9.1 million. The Nurse Travel division, previously included in the Healthcare segment, has been presented as discontinued operations in the Condensed Consolidated Statements of Operations for all periods presented.

The following is a summary of Allied Healthcare's and Nurse Travel's combined operating results for the three months ended March 31, 2014 and March 31, 2013, respectively (in thousands):

	2014			2013
Revenues	$	—		$	16,581
Income (loss) before income taxes	$	(209	)	$	131
Provision (benefit) for income taxes	$	(78	)	$	146
Net loss	$	(131	)	$	(15	)

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Acquisitions (Acquisitions Costs, by Acquisition) (Details) (USD $) In Millions, unless otherwise specified		1 Months Ended		1 Months Ended
	Mar. 31, 2014	Dec. 31, 2013 CyberCoders [Member]	Dec. 05, 2013 CyberCoders [Member]	Dec. 31, 2013 Whitaker [Member]	Dec. 02, 2013 Whitaker [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition		Dec. 05, 2013		Dec. 02, 2013
Name of Acquired Entity		CyberCoders Holdings, Inc.		Whitaker Medical, LLC
Business Combination, Consideration Transferred		$ 98.6		$ 21.3
Business Acquisition, Description of Acquired Entity		a provider of permanent placement services headquartered in Irvine, California		a provider of physician staffing services headquartered in Houston, Texas
Reason for Business Combination		The primary reason for the acquisition was to expand the Company's permanent placement services.		The primary reason for the acquisition was to expand the Company's Physician staffing services.
Cost of acquired entity, cash paid		93.6		18.5
Business Acquisition Contingent Consideration At Fair Value Accrued Earn-Out		5.0		2.8
Potential future earn-out obligations	16.0		11.0		5.0
Business Acquisition, Goodwill, Expected Tax Deductible Amount			10.3		7.5
Acquisition costs expensed		$ 1.5		$ 0.4

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Goodwill and Identifiable Assets (Future Amortization Expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 6,172	$ 5,379
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2012	18,339
2013	21,326
2014	17,720
2015	12,887
2016	10,306
Thereafter	15,629
Net Carrying Amount	$ 96,207		$ 102,380

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Acquisitions (Tables)

3 Months Ended

Mar. 31, 2014

Business Combinations [Abstract]

ScheduleOfPurchasePriceAllocationTableTextBlock [Table Text Block]

	2013 Acquisitions
	CyberCoders		Whitaker
Current assets	$	10,583	$	8,909
Property and equipment	3,790		272
Goodwill	70,784		7,452
Identifiable intangible assets	36,450		9,760
Other	915		568
Total assets acquired	$	122,522	$	26,961
Current liabilities	$	8,057	$	5,083
Other	15,817		551
Total liabilities assumed	23,874		5,634
Total purchase price	$	98,648	$	21,327

Schedule of Intangible Assets Acquired as Part of Business Combinations

The following table summarizes (in thousands) the allocation of the purchase price among the identifiable intangible assets for the acquisitions of CyberCoders and Whitaker, which are subject to finalization during the measurement period:

		Identifiable Intangible Asset Value
	Useful life	CyberCoders		Whitaker
Contractor relationships	2.5 years	$	3,900	$	1,800
Customer relationships	3 – 7 years	750		5,900
Non-compete agreements	3 years	800		60
In-use software	6 years	18,900		—
Trademarks	indefinite	12,100		2,000
Total identifiable intangible assets acquired		$	36,450	$	9,760

Schedule of Pro Forma Consolidated Results of Operations

Revenues	$	400,022
Income from continuing operations	$	11,032
Net income	$	25,429
Basic earnings per share:
Income from continuing operations	$	0.21
Net income	$	0.48
Diluted earnings per share:
Income from continuing operations	$	0.20
Net income	$	0.47
Weighted average number of shares outstanding	53,046
Weighted average number of shares and dilutive shares outstanding	54,036