ASGN (ASGN) 10-Q 11 Aug 14 2014 Q2 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	6 Months Ended
	Jun. 30, 2014	Aug. 01, 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	30-Jun-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q2	'
Amendment Flag	'false	'
Entity Common Stock, Shares Outstanding	'	54,475,629

CONDENSED_CONSOLIDATED_BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$30,753	$37,350
Accounts receivable, net of allowance of $4,374 and $3,067, respectively	295,935	262,224
Prepaid expenses	6,091	8,686
Deferred income tax assets	17,200	17,214
Workers' compensation and medical malpractice receivable	20,604	21,200
Other	3,090	3,200
Total current assets	373,673	349,874
Property and equipment, net	42,200	38,591
Goodwill	574,951	574,948
Identifiable intangible assets, net	276,104	288,455
Other	8,651	9,326
Total Assets	1,275,579	1,261,194
Current liabilities:	'	'
Current portion of long-term debt	18,250	10,000
Accounts payable	5,545	8,370
Accrued payroll and contract professional pay	84,685	76,556
Workers’ compensation and medical malpractice loss reserves	32,678	32,751
Income taxes payable	5,783	13,418
Other	23,617	27,926
Total current liabilities	170,558	169,021
Deferred income tax liabilities	49,525	49,584
Long-term debt	358,500	389,813
Other long-term liabilities	11,736	12,643
Total liabilities	590,319	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, 54,432,587 and 53,926,525 issued and outstanding, respectively	544	539
Paid-in capital	503,848	493,279
Retained earnings	180,905	146,199
Accumulated other comprehensive income (loss)	-37	116
Total stockholders’ equity	685,260	640,133
Total Liabilities and Stockholders’ Equity	$1,275,579	$1,261,194

CONDENSED_CONSOLIDATED_BALANCE1

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Current assets:	'	'
Accounts receivable, allowance	$4,374	$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)	54,432,587	53,926,525
Common Stock: shares outstanding (in shares)	54,432,587	53,926,525

CONDENSED_CONSOLIDATED_STATEME

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenues	$468,618	$407,864	$907,892	$786,908
Cost of services	315,891	286,532	617,577	555,465
Gross profit	152,727	121,332	290,315	231,443
Selling, general and administrative expenses	107,923	84,282	212,057	166,159
Amortization of intangible assets	6,156	5,275	12,328	10,654
Operating income	38,648	31,775	65,930	54,630
Interest expense, net	-3,103	-4,081	-6,431	-9,177
Write-off of loan costs	0	-14,958	0	-14,958
Income before income taxes	35,545	12,736	59,499	30,495
Provision for income taxes	14,846	5,493	24,752	13,036
Income from continuing operations	20,699	7,243	34,747	17,459
Gain on sale of discontinued operations, net of income taxes	0	0	0	14,412
Income (loss) from discontinued operations, net of income taxes	90	96	-41	81
Net income	20,789	7,339	34,706	31,952
Basic earnings per common share:	'	'	'	'
Income from continuing operations	$0.38	$0.14	$0.64	$0.33
Discontinued operations	$0	$0	$0	$0.27
Net income	$0.38	$0.14	$0.64	$0.60
Diluted earnings per common share:	'	'	'	'
Income from continuing operations	$0.38	$0.13	$0.63	$0.32
Discontinued operations	$0	$0.01	$0	$0.27
Net income	$0.38	$0.14	$0.63	$0.59
Number of shares and share equivalents used to calculate earnings per share:	'	'	'	'
Basic	54,372	53,378	54,239	53,213
Diluted	55,173	54,327	55,098	54,222
Reconciliation of net income to comprehensive income:	'	'	'	'
Net income	20,789	7,339	34,706	31,952
Changes in fair value of derivatives, net of tax	7	76	51	143
Foreign currency translation adjustment, net of tax	-160	403	-204	-856
Comprehensive income	$20,636	$7,818	$34,553	$31,239

CONDENSED_CONSOLIDATED_STATEME1

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
Cash Flows from Operating Activities:	'	'
Net income	$34,706	$31,952
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Gain on sale of discontinued operations, net of income taxes	0	-14,412
Depreciation and amortization	18,463	14,434
Stock-based compensation	7,285	6,210
Write-off of loan costs	0	14,958
Gross excess tax benefits from stock-based compensation	-3,217	-2,704
Workers’ compensation and medical malpractice provision	2,505	3,071
Other	3,943	1,226
Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:	'	'
Accounts receivable	-37,067	-33,329
Prepaid expenses	1,461	2,521
Accounts payable	-2,872	-1,249
Accrued payroll and contract professional pay	8,125	12,493
Income taxes payable	-4,414	-1,214
Other	-3,909	-3,630
Net cash provided by operating activities	25,009	30,327
Cash Flows from Investing Activities:	'	'
Cash paid for property and equipment	9,638	7,328
Cash received from sale of discontinued operations, net	0	31,922
Other	406	-1,872
Net cash provided by (used in) investing activities	-9,232	22,722
Cash Flows from Financing Activities:	'	'
Principal payments of long-term debt	-122,563	-440,775
Proceeds from term debt	99,500	383,500
Proceeds from stock transactions	3,268	3,912
Payments of employment taxes related to release of restricted stock awards	-4,544	-5,602
Gross excess tax benefits from stock-based compensation	3,217	2,704
Debt Issuance Costs	-446	-6,563
Payments of accrued earn-outs	-691	-3,425
Other	0	-14
Net cash used in financing activities	-22,259	-66,263
Effect of exchange rate changes on cash and cash equivalents	-115	-154
Net Increase in Cash and Cash Equivalents	-6,597	-13,368
Cash and Cash Equivalents at Beginning of Year	37,350	27,479
Cash and Cash Equivalents at End of Period	30,753	14,111
Supplemental Disclosure of Cash Flow Information:	'	'
Income taxes	29,175	12,580
Interest	5,899	8,535
Supplemental Disclosure of Non-Cash Transactions:	'	'
Acquisition of property and equipment through accounts payable	$639	$993

Financial_Statement_Presentati

Financial Statement Presentation	6 Months Ended
	Jun. 30, 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 and the rules of the Securities and Exchange Commission. 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 any of the interim periods 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 ("2013 10-K").

Accounting_Standards_Updates_N

Accounting Standards Updates (Notes)	6 Months Ended
	Jun. 30, 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.
	In May 2014, the Financial Accounting Standards Board issued Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) ("ASU 2014-09"). ASU 2014-09 improves comparability of revenue recognition practices across entities, industries, jurisdictions and capital markets, and requires entities to provide additional disclosures. It is effective for annual reporting periods beginning after December 15, 2016. The Company does not expect the adoption of this guidance to have a material effect on its consolidated financial statements.
	In May 2014, the Financial Accounting Standards Board issued Accounting Standards Update No. 2014-12, Compensation-Stock Compensation (Topic 718) Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period ("ASU 2014-12"). ASU 2014-12 requires that a performance target that affects vesting, and which could be achieved after the requisite service period, be treated as a performance condition. It is effective for annual reporting periods beginning after December 15, 2015. The Company does not expect the adoption of this guidance to have a material effect on its consolidated financial statements.

Aquisitions

Aquisitions	6 Months Ended
	Jun. 30, 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 $7.2 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 six months ended June 30, 2014, the Company adjusted CyberCoder's and Whitaker's purchase price allocation. The adjustments related to net working capital, were not material and had no impact on the condensed consolidated statements of operations, and accordingly they were 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		$	9,155
	Property and equipment		3,790			272
	Goodwill		70,784			7,216
	Identifiable intangible assets		36,450			9,760
	Other		915			568
	Total assets acquired		$	122,522		$	26,971
	Current liabilities		$	8,057		$	5,093
	Other		15,817			551
	Total liabilities assumed		23,874			5,644
	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 the six months ended June 30, 2013 as 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. 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	$	831,486
	Income from continuing operations	$	19,693
	Net income	$	34,186
	Basic earnings per share:
	Income from continuing operations	$	0.37
	Net income	$	0.64
	Diluted earnings per share:
	Income from continuing operations	$	0.36
	Net income	$	0.63
	Number of shares used to calculate earnings per share:
	Basic	53,213
	Diluted	54,222

Discontinued_Operations_Discon

Discontinued Operations Discontinued Operations	6 Months Ended
	Jun. 30, 2014
Discontinued Operations and Disposal Groups [Abstract]	'
Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]	'
	Discontinued Operations. During 2013, the Company sold in two separate transactions its Nurse Travel and Allied Healthcare divisions, both of which were previously included in the Company’s Healthcare segment. These divisions have been presented as discontinued operations in the Condensed Consolidated Statements of Operations for all periods presented. The following is a summary of the combined operating results of these two divisions (in thousands):
		Three Months Ended				Six Months Ended
		June 30,				June 30,
		2014		2013		2014			2013
	Revenues	$	—	$	10,035	$	—		$	26,616
	Income (loss) before income taxes	$	126	$	180	$	(83	)	$	311
	Provision (benefit) for income taxes	$	36	$	84	$	(42	)	$	230
	Net income (loss)	$	90	$	96	$	(41	)	$	81

LongTerm_Debt

Long-Term Debt	6 Months Ended
	Jun. 30, 2014
Debt Disclosure [Abstract]	'
Long-Term Debt	'
	Long-Term Debt. Long-term debt consisted of the following at June 30, 2014 and December 31, 2013 (in thousands):
		2014			2013
	Senior Secured Debt
	Revolving credit facility, due May 2018	$	28,500		$	44,500
	Term A loan facility, due May 2018	167,938			92,500
	Term B loan facility, due May 2020	180,312			262,813
		$	376,750		$	399,813
	On May 16, 2013, the Company entered into a new $500.0 million credit facility and repaid all borrowings under the previous facility. This new 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 June 30, 2014, borrowings on the term A loan facility and revolving credit facility both bore interest at 2.2 percent. Borrowings on the term B loan facility bore interest at 3.5 percent. The weighted average interest rate at June 30, 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		$	9,125
	2015		18,250
	2016		18,250
	2017		18,250
	2018		132,562
	Thereafter		180,313
			$	376,750
	As of June 30, 2014 and December 31, 2013, the Company was in compliance with all of its debt covenants. As of June 30, 2014, the Company had a ratio of funded debt to consolidated EBITDA of 1.98 to 1.00 and had $93.6 million of borrowings available under the revolving credit facility.

Fair_Value_Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 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 at June 30, 2014 was $376.8 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 $376.3 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 60.0 percent for Whitaker and 50.0 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 division 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 liability is included in the Condensed Consolidated Balance Sheets in other current liabilities and other long-term liabilities. Fair value adjustments outside of the measurement period 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 June 30, 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						Six Months Ended
		June 30,						June 30,
		2014			2013			2014			2013
	Contingent consideration
	Balance at beginning of period	$	(7,860	)	$	(6,544	)	$	(8,527	)	$	(7,577	)
	Payments on contingent consideration	—			3,425			691			3,425
	Fair value adjustment	—			62			—			892
	Foreign currency translation adjustment	—			(114		)	(24		)	89
	Balance at end of period	$	(7,860	)	$	(3,171	)	$	(7,860	)	$	(3,171	)
	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 six months ended June 30, 2014, no fair value adjustments were required for non-financial assets or liabilities

Goodwill_and_Identifiable_Asse

Goodwill and Identifiable Assets	6 Months Ended
	Jun. 30, 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 realignment 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 ended December 31, 2013 and the six months ended June 30, 2014 were 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	—				—				—				—				(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	—				—				—				—				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	—				—				—				—				—				—
		289,712				221,659				59,013				4,564				—				574,948
	Acquisition accounting	—				257				(236		)		—				—				21
	Translation adjustment	—				—				—				(18		)		—				(18		)
	Balance as of June 30, 2014
	Gross goodwill	289,712				221,916				58,777				4,546				—				574,951
	Accumulated impairment	—				—				—				—				—				—
		$	289,712			$	221,916			$	58,777			$	4,546			$	—			$	574,951
	As of the dates presented, the Company had the following acquired intangible assets (in thousands):
				As of June 30, 2014												As of December 31, 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		$	109,999			$	49,682			$	60,317			$	110,007			$	41,564			$	68,443
	Contractor relations	2 - 7 years		43,595				33,074				10,521				43,598				30,737				12,861
	Non-compete agreements	2 - 7 years		3,860				1,716				2,144				3,863				1,424				2,439
	In-use software	6 years		18,900				1,839				17,061				18,900				263				18,637
				176,354				86,311				90,043				176,368				73,988				102,380
	Intangible assets not subject to amortization:
	Trademarks			186,061				—				186,061				186,075				—				186,075
	Goodwill			574,951				—				574,951				574,948				—				574,948
	Total			$	937,366			$	86,311			$	851,055			$	937,391			$	73,988			$	863,403
	Amortization expense for intangible assets with finite lives was $6.2 million and $5.3 million for the three months ended June 30, 2014 and 2013, respectively. Amortization expense for intangible assets with finite lives was $12.3 million and $10.7 million for the six months ended June 30, 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	$	12,184
	2015	21,323
	2016	17,718
	2017	12,886
	2018	10,305
	Thereafter	15,627
		$	90,043
	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.

Incentive_Award_Plan_and_Emplo

Incentive Award Plan and Employee Stock Purchase Plan	6 Months Ended
	Jun. 30, 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. On March 26, 2014, the CEO was awarded 91,569 performance-based RSUs with a grant date fair market value of $3.3 million, which will vest in three equal 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. On March 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 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 26, 2014, May 15, 2014 and June 16, 2014, the Company granted 27,141, 16,596 and 976 performance-based RSUs, respectively, to certain other executive officers with an aggregate grant date fair value of $1.0 million, $0.6 million and $35,000, respectively. The March 26, 2014 grants will vest on January 2, 2015, and the May 15, 2014 and June 16, 2014 grants will vest on May 15, 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 31, 2014, the Company issued 90,837 shares of common stock under the On Assignment 2010 Employee Stock Purchase Plan (the "ESPP").
	Compensation expense related to stock-based compensation, including the ESPP, was $4.1 million and $3.5 million for the three months ended June 30, 2014 and 2013, respectively. Compensation expense related to stock-based compensation, including the ESPP, was $7.3 million and $6.0 million for the six months ended June 30, 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.

Commitments_and_Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 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 $12.1 million and $11.6 million, net of anticipated insurance and indemnification recoveries of $20.6 million and $21.2 million, at June 30, 2014 and December 31, 2013, respectively. Included in these amounts is one claim related to our discontinued operations for $10.8 million and $11.1 million, as of June 30, 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 June 30, 2014 and December 31, 2013 were $2.9 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 businesses meet predetermined targets, the Company is obligated to make additional cash payments in accordance with the terms of such contingent consideration agreements. As of June 30, 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 June 30, 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. 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.

Earnings_per_share

Earnings per share	6 Months Ended
	Jun. 30, 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 stock options, restricted stock 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		Six Months Ended
		June 30,		June 30,
		2014	2013	2014	2013
	Weighted average number of common shares outstanding used to compute basic earnings per share	54,372	53,378	54,239	53,213
	Dilutive effect of stock-based awards	801	949	859	1,009
	Number of shares used to compute diluted earnings per share	55,173	54,327	55,098	54,222
	There were 182,000 and 107,000 weighted average share equivalents outstanding during the three and six months ended June 30, 2013, respectively, that were excluded from the computation of diluted earnings per share that were anti-dilutive when applying the treasury stock method. There were no significant share equivalents outstanding during the three and six months ended June 30, 2014 that became anti-dilutive when applying the treasury stock method.

Income_Taxes

Income Taxes	6 Months Ended
	Jun. 30, 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.

Segment_Reporting

Segment Reporting	6 Months Ended
	Jun. 30, 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 realignment of 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 and Allied Healthcare divisions. See Note 4 Discontinued Operations for further information. The realignment and 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 (in thousands):
		Three Months Ended June 30, 2014
		Apex		Oxford		Physician		Life Sciences Europe		Corporate			Total
	Revenues	$	297,893	$	126,004	$	33,657	$	11,064	$	—		$	468,618
	Gross profit	84,677		53,611		10,298		4,141		—			152,727
	Operating income	31,708		17,828		2,455		1,028		(14,371		)	38,648
	Amortization	4,089		1,362		634		71		—			6,156
		Three Months Ended June 30, 2013
		Apex		Oxford		Physician		Life Sciences Europe		Corporate			Total
	Revenues	$	262,347	$	109,153	$	26,466	$	9,898	$	—		$	407,864
	Gross profit	72,912		37,122		7,640		3,658		—			121,332
	Operating income	24,637		15,944		2,213		448		(11,467		)	31,775
	Amortization	4,881		96		176		102		20			5,275
		Six Months Ended June 30, 2014
		Apex		Oxford		Physician		Life Sciences Europe		Corporate			Total
	Revenues	$	576,301	$	243,504	$	65,448	$	22,639	$	—		$	907,892
	Gross profit	160,183		102,637		19,136		8,359		—			290,315
	Operating income	54,492		32,112		3,714		2,227		(26,615		)	65,930
	Amortization	8,178		2,732		1,268		142		8			12,328
		Six Months Ended June 30, 2013
		Apex		Oxford		Physician		Life Sciences Europe		Corporate			Total
	Revenues	$	502,112	$	211,841	$	52,768	$	20,187	$	—		$	786,908
	Gross profit	136,893		71,937		15,123		7,490		—			231,443
	Operating income	41,866		29,610		4,639		981		(22,466		)	54,630
	Amortization	9,762		203		352		262		75			10,654
	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				Six Months Ended
		June 30,				June 30,
		2014		2013		2014		2013
	Revenues:
	Domestic	$	448,296	$	388,744	$	866,960	$	747,393
	Foreign	20,322		19,120		40,932		39,515
		$	468,618	$	407,864	$	907,892	$	786,908

Fair_Value_Measurements_Polici

Fair Value Measurements (Policies)	6 Months Ended
	Jun. 30, 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 at June 30, 2014 was $376.8 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 $376.3 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 60.0 percent for Whitaker and 50.0 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 division 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 liability is included in the Condensed Consolidated Balance Sheets in other current liabilities and other long-term liabilities. Fair value adjustments outside of the measurement period are included in the Condensed Consolidated Statements of Operations and Comprehensive Income in selling, general and administrative expenses.

Acquisitions_Tables

Acquisitions (Tables)	6 Months Ended
	Jun. 30, 2014
Business Combinations [Abstract]	'
ScheduleOfPurchasePriceAllocationTableTextBlock [Table Text Block]	'
			2013 Acquisitions
			CyberCoders			Whitaker
	Current assets		$	10,583		$	9,155
	Property and equipment		3,790			272
	Goodwill		70,784			7,216
	Identifiable intangible assets		36,450			9,760
	Other		915			568
	Total assets acquired		$	122,522		$	26,971
	Current liabilities		$	8,057		$	5,093
	Other		15,817			551
	Total liabilities assumed		23,874			5,644
	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	$	831,486
	Income from continuing operations	$	19,693
	Net income	$	34,186
	Basic earnings per share:
	Income from continuing operations	$	0.37
	Net income	$	0.64
	Diluted earnings per share:
	Income from continuing operations	$	0.36
	Net income	$	0.63
	Number of shares used to calculate earnings per share:
	Basic	53,213
	Diluted	54,222

Discontinued_Operations_Discon1

Discontinued Operations Discontinued Operations (Tables)	6 Months Ended
	Jun. 30, 2014
Discontinued Operations and Disposal Groups [Abstract]	'
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures [Table Text Block]	'
		Three Months Ended				Six Months Ended
		June 30,				June 30,
		2014		2013		2014			2013
	Revenues	$	—	$	10,035	$	—		$	26,616
	Income (loss) before income taxes	$	126	$	180	$	(83	)	$	311
	Provision (benefit) for income taxes	$	36	$	84	$	(42	)	$	230
	Net income (loss)	$	90	$	96	$	(41	)	$	81

LongTerm_Debt_Tables

Long-Term Debt (Tables)	6 Months Ended
	Jun. 30, 2014
Debt Disclosure [Abstract]	'
Schedule of Long-term Debt	'
	Long-term debt consisted of the following at June 30, 2014 and December 31, 2013 (in thousands):
		2014			2013
	Senior Secured Debt
	Revolving credit facility, due May 2018	$	28,500		$	44,500
	Term A loan facility, due May 2018	167,938			92,500
	Term B loan facility, due May 2020	180,312			262,813
		$	376,750		$	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		$	9,125
	2015		18,250
	2016		18,250
	2017		18,250
	2018		132,562
	Thereafter		180,313
			$	376,750

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 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 June 30, 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						Six Months Ended
		June 30,						June 30,
		2014			2013			2014			2013
	Contingent consideration
	Balance at beginning of period	$	(7,860	)	$	(6,544	)	$	(8,527	)	$	(7,577	)
	Payments on contingent consideration	—			3,425			691			3,425
	Fair value adjustment	—			62			—			892
	Foreign currency translation adjustment	—			(114		)	(24		)	89
	Balance at end of period	$	(7,860	)	$	(3,171	)	$	(7,860	)	$	(3,171	)

Goodwill_and_Identifiable_Asse1

Goodwill and Identifiable Assets (Tables)	6 Months Ended
	Jun. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Schedule of Goodwill	'
	The changes in the carrying amount of goodwill for the year ended December 31, 2013 and the six months ended June 30, 2014 were 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	—				—				—				—				(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	—				—				—				—				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	—				—				—				—				—				—
		289,712				221,659				59,013				4,564				—				574,948
	Acquisition accounting	—				257				(236		)		—				—				21
	Translation adjustment	—				—				—				(18		)		—				(18		)
	Balance as of June 30, 2014
	Gross goodwill	289,712				221,916				58,777				4,546				—				574,951
	Accumulated impairment	—				—				—				—				—				—
		$	289,712			$	221,916			$	58,777			$	4,546			$	—			$	574,951
Schedule of Acquired Intangible Assets	'
	Company had the following acquired intangible assets (in thousands):
				As of June 30, 2014												As of December 31, 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		$	109,999			$	49,682			$	60,317			$	110,007			$	41,564			$	68,443
	Contractor relations	2 - 7 years		43,595				33,074				10,521				43,598				30,737				12,861
	Non-compete agreements	2 - 7 years		3,860				1,716				2,144				3,863				1,424				2,439
	In-use software	6 years		18,900				1,839				17,061				18,900				263				18,637
				176,354				86,311				90,043				176,368				73,988				102,380
	Intangible assets not subject to amortization:
	Trademarks			186,061				—				186,061				186,075				—				186,075
	Goodwill			574,951				—				574,951				574,948				—				574,948
	Total			$	937,366			$	86,311			$	851,055			$	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	$	12,184
	2015	21,323
	2016	17,718
	2017	12,886
	2018	10,305
	Thereafter	15,627
		$	90,043

Earnings_per_share_Tables

Earnings per share (Tables)	6 Months Ended
	Jun. 30, 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		Six Months Ended
		June 30,		June 30,
		2014	2013	2014	2013
	Weighted average number of common shares outstanding used to compute basic earnings per share	54,372	53,378	54,239	53,213
	Dilutive effect of stock-based awards	801	949	859	1,009
	Number of shares used to compute diluted earnings per share	55,173	54,327	55,098	54,222

Segment_Reporting_Tables

Segment Reporting (Tables)	6 Months Ended
	Jun. 30, 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 (in thousands):
		Three Months Ended June 30, 2014
		Apex		Oxford		Physician		Life Sciences Europe		Corporate			Total
	Revenues	$	297,893	$	126,004	$	33,657	$	11,064	$	—		$	468,618
	Gross profit	84,677		53,611		10,298		4,141		—			152,727
	Operating income	31,708		17,828		2,455		1,028		(14,371		)	38,648
	Amortization	4,089		1,362		634		71		—			6,156
		Three Months Ended June 30, 2013
		Apex		Oxford		Physician		Life Sciences Europe		Corporate			Total
	Revenues	$	262,347	$	109,153	$	26,466	$	9,898	$	—		$	407,864
	Gross profit	72,912		37,122		7,640		3,658		—			121,332
	Operating income	24,637		15,944		2,213		448		(11,467		)	31,775
	Amortization	4,881		96		176		102		20			5,275
		Six Months Ended June 30, 2014
		Apex		Oxford		Physician		Life Sciences Europe		Corporate			Total
	Revenues	$	576,301	$	243,504	$	65,448	$	22,639	$	—		$	907,892
	Gross profit	160,183		102,637		19,136		8,359		—			290,315
	Operating income	54,492		32,112		3,714		2,227		(26,615		)	65,930
	Amortization	8,178		2,732		1,268		142		8			12,328
		Six Months Ended June 30, 2013
		Apex		Oxford		Physician		Life Sciences Europe		Corporate			Total
	Revenues	$	502,112	$	211,841	$	52,768	$	20,187	$	—		$	786,908
	Gross profit	136,893		71,937		15,123		7,490		—			231,443
	Operating income	41,866		29,610		4,639		981		(22,466		)	54,630
	Amortization	9,762		203		352		262		75			10,654
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				Six Months Ended
		June 30,				June 30,
		2014		2013		2014		2013
	Revenues:
	Domestic	$	448,296	$	388,744	$	866,960	$	747,393
	Foreign	20,322		19,120		40,932		39,515
		$	468,618	$	407,864	$	907,892	$	786,908

Acquisitions_Acquisitions_Cost

Acquisitions (Acquisitions Costs, by Acquisition) (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013	Dec. 05, 2013	Dec. 31, 2013	Dec. 02, 2013
In Millions, unless otherwise specified		CyberCoders [Member]	CyberCoders [Member]	Whitaker [Member]	Whitaker [Member]
Business Acquisition [Line Items]	'	'	'	'	'
Effective Date of Acquisition	'	5-Dec-13	'	2-Dec-13	'
Name of Acquired Entity	'	'CyberCoders Holdings, Inc.	'	'Whitaker Medical, LLC	'
Business Combination, Consideration Transferred	'	$98.60	'	$21.30	'
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	'	2.8	'
Potential future earn-out obligations	16	'	11	'	5
Business Acquisition, Goodwill, Expected Tax Deductible Amount	'	'	10.3	'	7.2
Acquisition costs expensed	'	$1.50	'	$0.40	'

Acquisitions_Schedule_of_Purch

Acquisitions (Schedule of Purchase Price Allocation) (Details) (USD $)	Dec. 05, 2013	Dec. 02, 2013
In Thousands, unless otherwise specified	CyberCoders [Member]	Whitaker [Member]
Business Acquisition [Line Items]	'	'
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets	$10,583	$9,155
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	3,790	272
BusinessCombinationRecognizedGoodwill	70,784	7,216
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	26,971
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities	8,057	5,093
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	5,644
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	$98,648	$21,327

Acquisitions_Schedule_of_Intan

Acquisitions (Schedule of Intangible Assets Acquired as Part of Business Combination) (Details) (USD $)

6 Months Ended

6 Months Ended

In Thousands, unless otherwise specified

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Dec. 05, 2013

Dec. 05, 2013

Dec. 05, 2013

Dec. 05, 2013

Dec. 05, 2013

Dec. 05, 2013

Dec. 02, 2013

Dec. 02, 2013

Dec. 02, 2013

Dec. 02, 2013

Dec. 02, 2013

Jun. 30, 2014

Jun. 30, 2014

Contractor Relations [Member]

Non-compete agreements

Computer Software, Intangible Asset [Member]

CyberCoders [Member]

CyberCoders [Member]

CyberCoders [Member]

CyberCoders [Member]

CyberCoders [Member]

CyberCoders [Member]

Whitaker [Member]

Whitaker [Member]

Whitaker [Member]

Whitaker [Member]

Whitaker [Member]

Minimum [Member]

Maximum [Member]

Trademarks [Member]

Contractor Relations [Member]

Customer relations

Non-compete agreements

Computer Software, Intangible Asset [Member]

Trademarks [Member]

Contractor Relations [Member]

Customer relations

Non-compete agreements

Customer relations

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

'

'

Acquisitions_Business_Acquisit

Acquisitions (Business Acquisition, Pro Forma Information) (Details) (USD $)	6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 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. 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	$831,486
Operating income	19,693
Net income	$34,186
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Basic	$0.37
Basic earnings per share (in dollars per share)	$0.64
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Diluted	$0.36
Diluted earnings per share (in dollars per share)	$0.63
Weighted average number of shares outstanding	53,213
Weighted average number of shares and dilutive shares outstanding	54,222

Discontinued_Operations_Discon2

Discontinued Operations Discontinued Operations (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Discontinued Operations and Disposal Groups [Abstract]	'	'	'	'
Gain on sale of discontinued operations, net of income taxes	$0	$0	$0	$14,412
Disposal Group, Including Discontinued Operation, Revenue	0	10,035	0	26,616
Disposal Group, Including Discontinued Operation, Operating Income (Loss)	126	180	-83	311
Discontinued Operation, Tax Effect of Discontinued Operation	36	84	-42	230
Income (loss) from discontinued operations, net of income taxes	$90	$96	($41)	$81

LongTerm_Debt_LongTerm_Debt_Sc

Long-Term Debt Long-Term Debt Schedule (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Debt Instrument [Line Items]	'	'
Secured Debt	$376,750	$399,813
Revolving Credit Facility due May 2018 [Member]	'	'
Debt Instrument [Line Items]	'	'
Secured Debt	28,500	44,500
Term-A Loan Facility due May 2018 [Member]	'	'
Debt Instrument [Line Items]	'	'
Secured Debt	167,938	92,500
Term-B Loan Facility due May 2020 [Member]	'	'
Debt Instrument [Line Items]	'	'
Secured Debt	$180,312	$262,813

LongTerm_Debt_Debt_Future_Paym

Long-Term Debt Debt Future Payments (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Debt Disclosure [Abstract]	'	'
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year	$9,125	'
Long-term Debt, Maturities, Repayments of Principal in Year Two	18,250	'
Long-term Debt, Maturities, Repayments of Principal in Year Three	18,250	'
Long-term Debt, Maturities, Repayments of Principal in Year Four	18,250	'
Long-term Debt, Maturities, Repayments of Principal in Year Five	132,562	'
Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five	180,313	'
Secured Debt	$376,750	$399,813

LongTerm_Debt_Longterm_Debt_te

Long-Term Debt Long-term Debt text (Details) (USD $)

0 Months Ended

6 Months Ended

In Millions, unless otherwise specified

Jun. 30, 2014

16-May-13

Jun. 30, 2014

Feb. 28, 2014

16-May-13

Jun. 30, 2014

Feb. 28, 2014

16-May-13

Jun. 30, 2014

16-May-13

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Term A Loans, Term B Loans and Revolving Loans [Member]

Term-A Loan Facility due May 2018 [Member]

Term-A Loan Facility due May 2018 [Member]

Term-A Loan Facility due May 2018 [Member]

Term-B Loan Facility due May 2020 [Member]

Term-B Loan Facility due May 2020 [Member]

Term-B Loan Facility due May 2020 [Member]

Revolving Credit Facility due May 2018 [Member]

Revolving Credit Facility due May 2018 [Member]

Eurodollar [Member]

Minimum [Member]

Minimum [Member]

Maximum [Member]

Maximum [Member]

Term-B Loan Facility due May 2020 [Member]

Revolving Credit Facility due May 2018 [Member]

Eurodollar Rate or Base Rate [Member]

Revolving Credit Facility due May 2018 [Member]

Eurodollar Rate or Base Rate [Member]

Revolving Loans and Term A Loans [Member]

Revolving Loans and Term A Loans [Member]

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Line of Credit Facility, Maximum Borrowing Capacity

'

$500

'

'

'

'

'

'

'

$125

'

'

'

'

'

Debt Instrument, Face Amount

'

'

'

'

100

'

'

275

'

'

'

'

'

'

'

Proceeds from long-term debt

'

'

'

82.5

'

'

'

'

'

'

'

'

'

'

'

Repayment of long-term debt

'

'

'

'

'

'

82.5

'

'

'

'

'

'

'

'

Line of Credit Facility, Increase in Additional Principal Amount

'

100

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Basis Spread on Variable Rate

'

'

'

'

'

'

'

'

'

'

2.50%

'

1.75%

'

2.50%

Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum

'

'

'

'

'

'

'

'

'

'

1.00%

'

'

'

'

Line of Credit Facility, Unused Capacity, Commitment Fee Percentage

'

'

'

'

'

'

'

'

'

'

'

0.25%

'

0.40%

'

Debt Instrument, Interest Rate at Period End

'

'

2.20%

'

'

3.50%

'

'

2.20%

'

'

'

'

'

'

Debt, Weighted Average Interest Rate

2.80%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Leverage Ratio

1.98

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Line of Credit Facility, Remaining Borrowing Capacity

'

'

'

'

'

'

'

'

$93.60

'

'

'

'

'

'

Fair_Value_Measurements_Fair_V

Fair Value Measurements (Fair Value Inputs, Liabilities, Quantitative Information) (Details) (USD $)	0 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014
Fair Value Inputs, Liabilities, Quantitative Information	'
Long-term Debt	376.8
Level 2 Inputs	'
Fair Value Inputs, Liabilities, Quantitative Information	'
Long-term debt, fair value	376.3
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%

Fair_Value_Measurements_Recurr

Fair Value Measurements (Recurring Basis) (Details) (Recurring Basis, USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
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)

Fair_Value_Measurements_Liabil

Fair Value Measurements (Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation) (Details) (Contingent Consideration Liability, USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Contingent Consideration Liability	'	'	'	'
Contingent consideration for acquisitions	'	'	'	'
Balance at beginning of period	($7,860)	($6,544)	($8,527)	($7,577)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Payments	0	3,425	691	3,425
Fair value adjustment	0	62	0	892
Foreign currency translation adjustment	0	-114	-24	89
Balance at end of period	($7,860)	($3,171)	($7,860)	($3,171)

Goodwill_and_Identifiable_Asse2

Goodwill and Identifiable Assets (Goodwill) (Details) (USD $)	6 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Dec. 31, 2012
Goodwill [Roll Forward]	'	'	'
Gross goodwill	$574,951	$574,948	$617,875
Accumulated impairment loss	0	0	-121,717
Goodwill	574,951	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	'
Goodwill, Purchase Accounting Adjustments	21	'	'
Translation adjustment	-18	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	58,777	59,013	51,561
Accumulated impairment loss	0	0	0
Goodwill	58,777	59,013	51,561
Translation adjustment	0	0	'
Life Sciences Europe	'	'	'
Goodwill [Roll Forward]	'	'	'
Gross goodwill	4,546	4,564	3,753
Accumulated impairment loss	0	0	0
Goodwill	4,546	4,564	3,753
Translation adjustment	-18	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	'
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	'
Goodwill, Purchase Accounting Adjustments	($236)	'	'

Goodwill_and_Identifiable_Asse3

Goodwill and Identifiable Assets (Acquired Intangible Assets) (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Dec. 31, 2012
Intangible Assets [Line Items]	'	'	'	'	'	'
Amortization of intangible assets	$6,156	$5,275	$12,328	$10,654	'	'
Intangible assets subject to amortization:	'	'	'	'	'	'
Gross Carrying Amount	176,354	'	176,354	'	176,368	'
Accumulated Amortization	86,311	'	86,311	'	73,988	'
Net Carrying Amount	90,043	'	90,043	'	102,380	'
Intangible assets not subject to amortization:	'	'	'	'	'	'
Trademarks, Carrying Amount	186,061	'	186,061	'	186,075	'
Goodwill, Carrying Amount	574,951	'	574,951	'	574,948	496,158
Total	'	'	'	'	'	'
Gross Carrying Amount	937,366	'	937,366	'	937,391	'
Net Carrying Amount	851,055	'	851,055	'	863,403	'
Customer relations	'	'	'	'	'	'
Intangible assets subject to amortization:	'	'	'	'	'	'
Gross Carrying Amount	109,999	'	109,999	'	110,007	'
Accumulated Amortization	49,682	'	49,682	'	41,564	'
Net Carrying Amount	60,317	'	60,317	'	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	43,595	'	43,595	'	43,598	'
Accumulated Amortization	33,074	'	33,074	'	30,737	'
Net Carrying Amount	10,521	'	10,521	'	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	3,860	'	3,860	'	3,863	'
Accumulated Amortization	1,716	'	1,716	'	1,424	'
Net Carrying Amount	2,144	'	2,144	'	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	'	18,900	'
Accumulated Amortization	1,839	'	1,839	'	263	'
Net Carrying Amount	$17,061	'	$17,061	'	$18,637	'

Goodwill_and_Identifiable_Asse4

Goodwill and Identifiable Assets (Future Amortization Expense) (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'	'	'	'	'
Amortization of intangible assets	$6,156	$5,275	$12,328	$10,654	'
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]	'	'	'	'	'
2012	12,184	'	12,184	'	'
2013	21,323	'	21,323	'	'
2014	17,718	'	17,718	'	'
2015	12,886	'	12,886	'	'
2016	10,305	'	10,305	'	'
Thereafter	15,627	'	15,627	'	'
Net Carrying Amount	$90,043	'	$90,043	'	$102,380

Incentive_Award_Plan_and_Emplo1

Incentive Award Plan and Employee Stock Purchase Plan (Details) (USD $)

3 Months Ended

6 Months Ended

0 Months Ended

0 Months Ended

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Mar. 31, 2014

Mar. 26, 2014

Mar. 26, 2014

Jun. 16, 2014

15-May-14

Mar. 26, 2014

Jan. 02, 2014

Mar. 26, 2014

2010 Employee Stock Purchase Plan (ESPP)

Chief Executive Officer

Apex employees [Domain]

Other Executive Officers [Member]

Other Executive Officers [Member]

Other Executive Officers [Member]

Tranche A [Member]

Tranche B [Member]

Performance Based Award

Performance Based Award

Performance Based Award

Performance Based Award

Performance Based Award

Chief Executive Officer

Chief Executive Officer

installment

Performance Based Award

Performance Based Award

installment

Deferred Compensation Arrangement with Individual, Share-based Payments

'

'

'

'

'

'

'

'

'

'

'

'

Share-based awards, grant date fair market value

'

'

'

'

'

$500,000

$2,200,000

$35,000

$600,000

$1,000,000

$800,000

$3,300,000

Share-based awards, grants in period

'

'

'

'

'

'

60,244

976

16,596

27,141

23,255

91,569

Share-based awards, number of equal vesting components

'

'

'

'

'

'

12

'

'

'

'

3

Employee stock purchase plan shares issued during period

'

'

'

'

90,837

'

'

'

'

'

'

'

Allocated Share-based Compensation Expense

$4,100,000

$3,500,000

$7,300,000

$6,000,000

'

'

'

'

'

'

'

'

Commitments_and_Contingencies_

Commitments and Contingencies (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
	property
Other Commitments [Line Items]	'	'
Workers' Compensation and Medical Malpractice Receivable, Current	$20,604,000	$21,200,000
Self Insurance Reserve	12,100,000	11,600,000
Letters of Credit Outstanding, Amount	2,900,000	2,700,000
Contingent consideration maximum	16,000,000	'
Liability for Uncertain Tax Positions, Noncurrent	1,600,000	1,600,000
Other	23,617,000	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	$10,800,000	$11,100,000

Earnings_per_share_Details

Earnings per share (Details)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Weighted Average Number of Shares Outstanding Reconciliation	'	'	'	'
Weighted average number of common shares outstanding used to compute basic earnings per share	54,372	53,378	54,239	53,213
Dilutive effect of stock-based awards	801	949	859	1,009
Number of shares used to compute diluted earnings per share	55,173	54,327	55,098	54,222

Earnings_per_share_Antidilutiv

Earnings per share Anti-dilutive (Details)	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	182,000	107,000

Segment_Reporting_Segment_Repo

Segment Reporting (Segment Reporting Information) (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
			segment
Segment Reporting [Abstract]	'	'	'	'
Reportable segments (in number of segments)	'	'	4	'
Revenues:	'	'	'	'
Revenues	$468,618	$407,864	$907,892	$786,908
Gross Profit:	'	'	'	'
Total Gross Profit	152,727	121,332	290,315	231,443
Operating Income (Loss):	'	'	'	'
Total Operating Income	38,648	31,775	65,930	54,630
Amortization of Intangible Assets	6,156	5,275	12,328	10,654
Apex	'	'	'	'
Revenues:	'	'	'	'
Revenues	297,893	262,347	576,301	502,112
Gross Profit:	'	'	'	'
Total Gross Profit	84,677	72,912	160,183	136,893
Operating Income (Loss):	'	'	'	'
Total Operating Income	31,708	24,637	54,492	41,866
Amortization of Intangible Assets	4,089	4,881	8,178	9,762
Oxford	'	'	'	'
Revenues:	'	'	'	'
Revenues	126,004	109,153	243,504	211,841
Gross Profit:	'	'	'	'
Total Gross Profit	53,611	37,122	102,637	71,937
Operating Income (Loss):	'	'	'	'
Total Operating Income	17,828	15,944	32,112	29,610
Amortization of Intangible Assets	1,362	96	2,732	203
Physician	'	'	'	'
Revenues:	'	'	'	'
Revenues	33,657	26,466	65,448	52,768
Gross Profit:	'	'	'	'
Total Gross Profit	10,298	7,640	19,136	15,123
Operating Income (Loss):	'	'	'	'
Total Operating Income	2,455	2,213	3,714	4,639
Amortization of Intangible Assets	634	176	1,268	352
Life Sciences Europe	'	'	'	'
Revenues:	'	'	'	'
Revenues	11,064	9,898	22,639	20,187
Gross Profit:	'	'	'	'
Total Gross Profit	4,141	3,658	8,359	7,490
Operating Income (Loss):	'	'	'	'
Total Operating Income	1,028	448	2,227	981
Amortization of Intangible Assets	71	102	142	262
Corporate Segment	'	'	'	'
Operating Income (Loss):	'	'	'	'
Total Operating Income	-14,371	-11,467	-26,615	-22,466
Amortization of Intangible Assets	$0	$20	$8	$75

Segment_Reporting_Revenue_by_G

Segment Reporting (Revenue by Geographical Areas) (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenues from External Customers [Line Items]	'	'	'	'
Revenues	$468,618	$407,864	$907,892	$786,908
Domestic [Member]	'	'	'	'
Revenues from External Customers [Line Items]	'	'	'	'
Revenues	448,296	388,744	866,960	747,393
Foreign [Member]	'	'	'	'
Revenues from External Customers [Line Items]	'	'	'	'
Revenues	$20,322	$19,120	$40,932	$39,515