ASGN (ASGN) 10-Q 9 May 16 2016 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2016	May. 05, 2016
Entity Information [Line Items]
Entity Registrant Name	ON ASSIGNMENT INC
Entity Central Index Key	890,564
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		53,380,314

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash	$ 28,369	$ 23,869
Accounts receivable, net of allowance of $7,284 and $6,682, respectively	378,087	354,808
Prepaid expenses and income taxes	8,849	12,686
Workerscompensationreceivable	13,278	13,238
Other current assets	3,585	9,607
Total current assets	432,168	414,208
Property and equipment, net	54,481	53,196
Goodwill	875,657	874,906
Identifiable intangible assets, net	408,099	417,925
Other non-current assets	6,650	7,072
Total assets	1,777,055	1,767,307
Current liabilities:
Accounts payable	6,164	9,132
Accrued payroll and contract professional pay	110,886	88,100
Workers’ compensation loss reserves	14,910	15,020
Income taxes payable	3,157	673
Other current liabilities	40,637	47,425
Total current liabilities	175,754	160,350
Long-term debt	723,219	755,508
Deferred income tax liabilities	61,612	61,539
Other long-term liabilities	5,033	5,116
Total liabilities	$ 965,618	$ 982,513
Commitments and contingencies (Note 7)
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, 53,344,395 and 53,024,972 issued and outstanding, respectively	533	530
Paid-in capital	550,755	542,859
Retained earnings	266,968	249,567
Accumulated other comprehensive loss	(6,819)	(8,162)
Total stockholders’ equity	811,437	784,794
Total liabilities and stockholders’ equity	$ 1,777,055	$ 1,767,307

CONDENSED CONSOLIDATED BALANCE3

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Accounts receivable, allowance	$ 7,284	$ 6,682
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)	53,344,395	53,024,972
Common Stock: shares outstanding (in shares)	53,344,395	53,024,972

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenues	$ 582,040	$ 430,045
Cost of services	394,258	294,170
Gross profit	187,782	135,875
Selling, general and administrative expenses	139,881	105,935
Amortization of intangible assets	10,144	4,869
Operating income	37,757	25,071
Interest expense, net	(9,025)	(3,067)
Income before income taxes	28,732	22,004
Provision for income taxes	11,384	8,981
Income from continuing operations	17,348	13,023
Gain on sale of discontinued operations, net of income taxes	0	25,703
Income from discontinued operations, net of income taxes	53	409
Net income	$ 17,401	$ 39,135
Basic earnings per common share:
Income from continuing operations	$ 0.33	$ 0.25
Discontinued operations	0	0.51
Net income	0.33	0.76
Diluted earnings per common share:
Income from continuing operations	0.32	0.25
Discontinued operations	0	0.50
Net income	$ 0.32	$ 0.75
Number of shares and share equivalents used to calculate earnings per share:
Basic	53,147	51,519
Diluted	53,644	52,209
Reconciliation of net income to comprehensive income:
Net income	$ 17,401	$ 39,135
Changes in fair value of derivative, net of tax	0	47
Foreign currency translation adjustment	1,343	(3,724)
Comprehensive income	$ 18,744	$ 35,458

CONDENSED CONSOLIDATED STATEME5

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash Flows from Operating Activities:
Net income	$ 17,401	$ 39,135
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on sale of discontinued operations, net of income taxes	0	(25,703)
Depreciation and amortization	15,427	8,665
Stock-based compensation	6,924	3,954
Gross excess tax benefits from stock-based compensation	(914)	(1,643)
Workers’ compensation provision	549	586
Other	4,308	1,930
Changes in operating assets and liabilities:
Accounts receivable	(25,362)	(14,584)
Prepaid expenses and income taxes	3,847	7,954
Accounts payable	(2,290)	205
Accrued payroll and contract professional pay	22,640	3,160
Income taxes payable	3,067	(539)
Workers’ compensation loss reserves	(699)	(309)
Other	(7,584)	(2,868)
Net cash provided by operating activities	37,314	19,943
Cash Flows from Investing Activities:
Cash paid for property and equipment	(7,282)	(8,000)
Cash received from sale of discontinued operations, net	6,000	114,884
Other	176	12
Net cash provided by (used in) investing activities	(1,106)	106,896
Cash Flows from Financing Activities:
Principal payments of long-term debt	(33,000)	(80,563)
Proceeds from option exercises and employee stock purchase plan	4,023	3,555
Payment of employment taxes related to release of restricted stock awards	(3,590)	(3,991)
Gross excess tax benefits from stock-based compensation	914	1,643
Repurchase of common stock	0	(1,645)
Debt issuance or amendment costs	0	(486)
Net cash used in financing activities	(31,653)	(81,487)
Effect of exchange rate changes on cash and cash equivalents	(55)	(703)
Net Increase (Decrease) in Cash and Cash Equivalents	4,500	44,649
Cash and Cash Equivalents at Beginning of Year	23,869	31,714
Cash and Cash Equivalents at End of Period	28,369	76,363
Supplemental Disclosure of Cash Flow Information:
Income taxes	3,926	1,142
Interest	7,261	2,695
Supplemental Disclosure of Non-Cash Transactions:
Acquisition of property and equipment through accounts payable	$ 287	$ 1,011

Financial Statement Presentatio

Financial Statement Presentation	3 Months Ended
	Mar. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Financial Statement Presentation	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 ("GAAP") and the rules of the Securities and Exchange Commission (the "SEC"). Certain information and note disclosures normally included in annual financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to those rules and regulations. The December 31, 2015 condensed consolidated balance sheet was derived from audited 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 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, 2015 (" 2015 10-K").

Accounting Standards Updates (N

Accounting Standards Updates (Notes)	3 Months Ended
	Mar. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accounting Standards Update	2. Accounting Standards Update In April 2015, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update ("ASU") No. 2015-05, Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40) . ASU No. 2015-05 provides guidance to customers about whether a cloud computing arrangement includes a software license. If a cloud computing arrangement includes a software license, then the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, the customer should account for the arrangement as a service contract. It is effective for annual periods (including interim periods) beginning after December 15, 2015, and early adoption is permitted. The Company prospectively adopted ASU 2015-05 as of January 1, 2016, with no impact to its consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) , which is intended to improve financial reporting about leasing transactions. This standard requires a lessee to record on the balance sheet the assets and liabilities for the rights and obligations created by lease terms of more than 12 months. It is effective for annual periods (including interim periods) beginning after December 15, 2018, and early adoption is permitted. The Company is currently evaluating the impact the provisions of ASU 2016-02 will have on its consolidated financial statements. In March 2016, the FASB issued ASU No. 2016-09, Compensation - Stock Compensation (Topic 718) , which is intended to simplify the accounting for the taxes related to stock-based compensation, including adjustments to how excess tax benefits and a company's payments for tax withholdings should be classified. It is effective for annual periods (including interim periods) beginning after December 15, 2016, and early adoption is permitted. The Company is currently evaluating the impact the provisions of ASU 2016-09 will have on its consolidated financial statements. In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606) , which outlines a comprehensive new revenue recognition model designed to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In March 2016, the FASB issued ASU No. 2016-08, Revenue from Contracts with Customers (Topic 606) - Principal versus Agent Considerations (Reporting Revenue Gross versus Net) , which further clarifies the implementation guidance on principal versus agent considerations contained in ASU 2014-09. In April 2016, the FASB issued ASU No. 2016-10, Revenue from Contracts with Customers (Topic 606) - Identifying Performance Obligations and Licensing , which further clarifies the implementation guidance relating to identifying performance obligations and the licensing implementation guidance. These standards, pursuant to ASU No. 2015-14, Revenue from Contracts with Customers - Deferral of the Effective Date (Topic 606) issued by the FASB in August 2015, will be effective for annual periods (including interim periods) beginning after December 15, 2017. The Company is currently evaluating the impact these provisions will have on its consolidated financial statements.

Acquisitions

Acquisitions	3 Months Ended
	Mar. 31, 2016
Acquisitions [Abstract]
Business Combination Disclosure [Text Block]	3. Acquisitions On June 5, 2015 , the Company acquired all of the outstanding shares of the holding company for Creative Circle, LLC ("Creative Circle"). Creative Circle, which is headquartered in Los Angeles, California , was purchased to expand the Company’s technical and creative staffing services . The purchase price consisted of $540.0 million cash, $30.2 million of common stock ( 794,700 shares of the Company’s common stock), and estimated future contingent consideration which was valued at $13.8 million . Goodwill related to this acquisition totaled $358.0 million , and is deductible for income tax purposes. Acquisition expenses of approximately $5.7 million were expensed in 2015 and are included in selling, general and administrative expenses ("SG&A"). The results of operations for the acquisition have been combined with those of the Company from the acquisition date. On April 14, 2015 , the Company acquired all of the outstanding shares of LabResource B.V. ("LabResource") headquartered in Amsterdam, Netherlands for $12.7 million . LabResource was purchased to expand the Company's life sciences staffing business in Europe . Goodwill associated with this acquisition is not deductible for tax purposes. Acquisition expenses of approximately $0.4 million were expensed in 2015 and are included in SG&A. The results of operations for this 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 dates 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 price of Creative Circle and LabResource has been finalized and the following table summarizes the allocations (in thousands): Creative Circle LabResource Cash $ 4,840 $ 187 Accounts receivable 34,386 1,643 Prepaid expenses and other current assets 4,462 — Property and equipment 5,077 12 Goodwill 358,029 6,449 Identifiable intangible assets 194,500 7,528 Other 651 — Total assets acquired $ 601,945 $ 15,819 Current liabilities $ 12,254 $ 1,482 Other — 1,882 Total liabilities assumed 12,254 3,364 Total purchase price (1) (2) $ 589,691 $ 12,455 (1) Excluding cash acquired and a $0.9 million adjustment for net working capital in excess of the targeted amount (thereby increasing the actual purchase price paid), the purchase price for Creative Circle was $584.0 million as described in the discussion above. (2) Excluding cash acquired and a $0.4 million adjustment for net working capital that was less than the targeted amount (thereby reducing the actual purchase price paid), the purchase price for LabResource was $12.7 million as described in the discussion above. The following table summarizes (in thousands) the allocation of the purchase price among the identifiable intangible assets for the acquisitions: Identifiable Intangible Asset Value Useful life Creative Circle LabResource Contractor relationships 2 - 4 years $ 29,500 $ 947 Customer relationships 2 - 10 years 90,700 5,421 Non-compete agreements 2 - 6 years 7,300 20 Favorable contracts 5 years 900 — Trademarks indefinite 66,100 1,140 Total identifiable intangible assets acquired $ 194,500 $ 7,528 The summary below (in thousands, except for per share data) presents pro forma unaudited consolidated results of operations for the three months ended March 31, 2015 as if the acquisitions of Creative Circle and LabResource occurred on January 1, 2014. The pro forma financial information gives effect to certain adjustments, including amortization of intangible assets, interest expense on acquisition-related debt, provision for income taxes, and increased number of common shares as a result of the acquisitions. 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 acquisitions had been consummated as of the date indicated, nor are they necessarily indicative of future operating results. Revenues $ 494,708 Income from continuing operations $ 13,955 Net income $ 40,067 Basic earnings per share: Income from continuing operations $ 0.27 Net income $ 0.77 Diluted earnings per share: Income from continuing operations $ 0.26 Net income $ 0.76 Number of shares and share equivalents used to calculate earnings per share: Basic 52,314 Diluted 53,046

Discontinued Operations

Discontinued Operations	3 Months Ended
	Mar. 31, 2016
Discontinued Operations and Disposal Groups [Abstract]
Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]	4. Discontinued Operations On February 1, 2015, the Company completed the sale of its Physician Segment for $123.0 million including $6.0 million that was held in escrow and was released in March 2016. The gain on the sale was $25.7 million (net of income taxes of $14.4 million ). The operating results of this segment are presented as discontinued operations in the condensed consolidated statements of operations and comprehensive income for all periods presented. Cash flows from discontinued operations are included in the condensed consolidated statements of cash flows for the three months ended March 31, 2016 and 2015 . The cash flows that are attributable to the Physician Segment are as follows (in thousands): Three Months Ended March 31, 2016 2015 Net cash provided by (used in) operating activities $ 53 $ (1,778 ) Net cash provided by investing activities: Cash received from sale of discontinued operations, net $ 6,000 $ 114,884 Other — (14 ) Total cash provided by investing activities $ 6,000 $ 114,870 The following is a summary of the operating results of all of the Company's discontinued operations (in thousands): Three Months Ended March 31, 2016 2015 Revenues $ — $ 12,068 Costs of services — 8,653 Gross profit — 3,415 Selling, general and administrative expenses (85 ) 2,641 Amortization of intangible assets — 155 Income before income taxes 85 619 Provision for income taxes 32 210 Income from discontinued operations, net of income taxes $ 53 $ 409

Goodwill and Identifiable Asset

Goodwill and Identifiable Assets	3 Months Ended
	Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Identifiable Intangible Assets	5. Goodwill and Identifiable Intangible Assets The changes in the carrying amount of goodwill for the year ended December 31, 2015 and the three months ended March 31, 2016 are as follows (in thousands): Apex Segment Oxford Segment Total Balance as of December 31, 2014 $ 287,951 $ 224,109 $ 512,060 Creative Circle Acquisition 358,029 — 358,029 LabResource Acquisition — 6,449 6,449 Translation adjustment (1,363 ) (269 ) (1,632 ) Balance as of December 31, 2015 644,617 230,289 874,906 Translation adjustment 355 396 751 Balance as of March 31, 2016 $ 644,972 $ 230,685 $ 875,657 Acquired intangible assets consisted of the following (in thousands): As of March 31, 2016 As of December 31, 2015 Estimated Useful Life Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Subject to amortization: Customer relationships 2 - 10 years $ 196,780 $ 80,781 $ 115,999 $ 196,472 $ 74,640 $ 121,832 Contractor relationships 2 - 5 years 69,813 42,991 26,822 69,764 40,124 29,640 Non-compete agreements 2 - 7 years 10,889 3,626 7,263 10,874 3,163 7,711 In-use software 6 years 18,900 7,304 11,596 18,900 6,516 12,384 Favorable contracts 5 years 900 242 658 900 172 728 297,282 134,944 162,338 296,910 124,615 172,295 Not subject to amortization: Trademarks 245,761 — 245,761 245,630 — 245,630 Total $ 543,043 $ 134,944 $ 408,099 $ 542,540 $ 124,615 $ 417,925 Amortization expense for intangible assets with finite lives was $10.1 million and $4.9 million for the three months ended March 31, 2016 and 2015 , respectively. Estimated amortization expense for the remainder of this year, each of the next four years, and thereafter is as follows (in thousands): 2016 $ 29,515 2017 33,054 2018 28,928 2019 22,016 2020 14,515 Thereafter 34,310 $ 162,338 Goodwill and other intangible assets having an indefinite useful life are not amortized for financial statement purposes. These assets are reviewed for impairment on an annual basis as of October 31 and whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. There w ere no triggerin g events that required an interim impairment analysis during the current period.

Long-Term Debt

Long-Term Debt	3 Months Ended
	Mar. 31, 2016
Debt Disclosure [Abstract]
Long-Term Debt	6. Long-Term Debt Long-term debt consisted of the following (in thousands): March 31, 2016 December 31, 2015 $150 million revolving credit facility, due June 2020 $ 34,000 $ 50,000 $825 million Term B loan facility, due June 2022 707,000 724,000 741,000 774,000 Unamortized deferred loan costs (17,781 ) (18,492 ) $ 723,219 $ 755,508 On June 5, 2015, the Company entered into a new $975.0 million credit facility. The funds were used to repay the old credit facility and to fund the cash portion of the purchase of Creative Circle (see "Note 3. Acquisitions "). The new facility consists of (i) an $825.0 million seven-year term B loan facility and (ii) a $150.0 million five-year revolving loan facility. Under terms of the new facility, the Company has the ability to increase the principal amount of the loan facilities. Borrowings under the term B loan bear interest at LIBOR (floor of 75 basis points), plus 3.0 percent and borrowings under the revolving credit facility bear interest at LIBOR (or the bank’s base rate) plus 0.75 to 2.5 percent depending on leverage levels. A commitment fee of 0.25 to 0.40 percent is payable on the undrawn portion of the revolving credit facility. At March 31, 2016 , the weighted average interest rate was 3.7 percent . Under terms of the credit facility, the Company was required to make minimum quarterly payments of $2.1 million . Through March 31, 2016 , the Company repaid $134.0 million , and as a result, the next required payments will be on the maturity dates. The Company is also required to make mandatory prepayments, subject to specified exceptions, from excess cash flow and with 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 are secured by a lien on substantially all of the Company's tangible and intangible property and by a pledge of all of the equity interests in its direct and indirect domestic subsidiaries. The credit facility includes various restrictive covenants including the maximum ratio of consolidated funded debt to consolidated EBITDA ( 4.25 to 1.00 as of March 31, 2016 decreasing to 3.25 to 1.00 on March 31, 2018). The credit facility also contains certain customary limitations including, among other terms and conditions, the Company's ability to incur additional indebtedness, engage in mergers and acquisitions, and declare dividends. At March 31, 2016 the Company had a ratio of consolidated funded debt to consolidated EBITDA of 2.80 to 1.00. At March 31, 2016 the Company was in compliance with all of its debt covenants and had $112.5 million of borrowing available under the revolving credit facility.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	7. Commitments and Contingencies 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 lea ses two properties own ed by related parties. Rent expense for these two properties was $0.3 million for the three months ended March 31, 2016 and 2015 . The Company carries large retention policies for its workers’ compensation liability exposures. The workers' compensation 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 loss reserves were approximately $1.6 million and $1.8 million , net of anticipated insurance and indemnification recoveries of $13.3 million and $13.2 million , at March 31, 2016 and December 31, 2015 , respectively. 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, 2016 and December 31, 2015 were $3.5 million . 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, see note " 8. Fair Value Measurements ." Certain employees participate in the Company’s Change in Control Severance Plan, or have separate agreements that provide for certain benefits in the event of termination at the Company's convenience or following a change in control, as defined by the plan or agreement. Generally, these benefits are based on the employee’s length of service and position with the Company and include, severance, continuation of health insurance and in certain cases acceleration of vesting of option or stock awards. Legal Proceedings 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.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2016
Fair Value Disclosures [Abstract]
Fair Value Measurements	8. 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 March 31, 2016 was $723.2 million (net of $17.8 million of unamortized deferred loan costs, see "Note 6. Long-Term Debt "). The f air value of the long-term debt at that same date was $744.5 million as determined using the quoted price technique, based on Level 2 inputs (significant observable inputs other than quoted prices for identical assets in active markets) from the fair value hierarchy, and included the yields of comparable companies with similar credit characteristics . Related to its acquisitions, at March 31, 2016 , the Company had obligations to pay contingent consideration in cash if certain performance targets were met. The fair value of this contingent consideration was determined using an expected present value technique. Expected cash flows were 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 inputs (unobservable inputs) from the fair value hierarchy. The fair value of the liability for contingent consideration is established at the time of the acquisition and finalized by the end of the measurement period. Its fair value i s then remeasured on a recurring basis with c hanges due to the accretion of the present value discount, recorded in interest expense and changes related to new developments in expected performance, recorded in SG&A. At March 31, 2016 , the contingent consideration was determined to be $21.6 million and is included in other current liabilities. The Company expects to make the contingent consideration payments within the next three months. At December 31, 2015, contingent consideration wa s $21.0 million and was included in other current liabilities. The performance period for these contingent consideration arrangements ended on December 31, 2015. The following table summarizes the balance of the contingent consideration and changes for the periods presented (in thousands): Three Months Ended March 31, 2016 2015 Balance at beginning of period $ (20,981 ) $ (3,000 ) Additions for acquisitions — — Payments on contingent consideration — — Fair value adjustment (613 ) — Foreign currency translation adjustment — — Balance at end of period $ (21,594 ) $ (3,000 ) 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, 2016 and 2015, no fair value adjustments were required for non-financial assets or liabilities .

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Notes)	3 Months Ended
	Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Comprehensive Income (Loss) Note [Text Block]	9. Accumulated Other Comprehensive Loss The accumulated other comprehensive loss balance at March 31, 2016 and December 31, 2015 , and the activity during the three months ended March 31, 2016 , consists of foreign currency translation adjustments.

Stock-based compensation

Stock-based compensation	3 Months Ended
	Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Incentive Award Plan and Employee Stock Purchase Plan	10. Stock-based Compensation On March 31, 2016 , the Company issued 128,518 shares of common stock under its Employee Stock Purchase Plan, as amended (the "ESPP"). Stock-based compensation expense, including the ESPP, was $6.9 million and $4.0 million for the three months ended March 31, 2016 and 2015 , respectively, which was included in SG&A expense.

Earnings per share

Earnings per share	3 Months Ended
	Mar. 31, 2016
Earnings Per Share [Abstract]
Earnings per share	11. 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, 2016 2015 Weighted average number of common shares outstanding used to compute basic earnings per share 53,147 51,519 Dilutive effect of stock-based awards 497 690 Number of shares used to compute diluted earnings per share 53,644 52,209 There were 473,000 share equivalents outstanding during the three months ended March 31, 2016 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 and became anti-dilutive when applying the treasury stock method. During the three months ended March 31, 2015 there were no significant share equivalents outstanding that were excluded from the computation of diluted earnings per share because they became anti-dilutive when applying the treasury stock method.

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2016
Income Tax Disclosure [Abstract]
Income Taxes	12. Income Taxes For interim reporting periods, the Company estimates its 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 pre-tax income can impact the Company’s actual effective rate.

Segment Reporting

Segment Reporting	3 Months Ended
	Mar. 31, 2016
Segment Reporting [Abstract]
Segment Reporting	13. Segment Reporting On Assignment provides services through two operating segments, the Apex Segment and the Oxford Segment, with each addressing different sectors of the professional staffing market with distinct business models attuned to those sectors. Businesses in the Apex Segment predominately serve markets with a large and local talent pool, and provide a full range of skills through a network of local offices where clients most value relationship, speed, reliability and price. The Apex Segment provides a broad spectrum of technical, scientific and creative professionals for contract, contract-to-hire and permanent placement positions to Fortune 1000 and mid-market clients across the United States. Our businesses in this segment include Apex Systems, Lab Support and Creative Circle. Businesses in the Oxford Segment predominately serve markets with higher-end, specialized skills through a combination of national recruiting centers and local offices where clients most value the unique skill of the candidate and speed of response. The Oxford Segment provides specialized, niche staffing and consulting services in select skill and geographic markets. Our businesses in this segment include Oxford, CyberCoders and Life Sciences Europe. Effective January 1, 2016, there were two changes to the Company's segment configuration: 1) the Apex Segment now includes a small clinical research business which was previously included in the Oxford Segment, and 2) costs associated with personnel located at our Corporate office that have shared services roles and support certain of our businesses, primarily within the Oxford Segment, are now presented in the segments they support whereas previously they were presented within Corporate. For comparability purposes, prior periods have been adjusted to reflect these changes. The Company’s management evaluates the performance of each segment primarily based on revenues, gross profit and operating income. The information in the following tables 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 March 31, 2016 Apex Oxford Corporate (1) Total Revenues $ 433,155 $ 148,885 $ — $ 582,040 Gross profit 126,144 61,638 — 187,782 Operating income 39,986 12,760 (14,989 ) 37,757 Amortization 8,590 1,554 — 10,144 Three Months Ended March 31, 2015 Apex Oxford (2) Corporate (1) Total Revenues $ 295,971 $ 134,074 $ — $ 430,045 Gross profit 80,152 55,723 — 135,875 Operating income 22,896 12,713 (10,538 ) 25,071 Amortization 3,522 1,347 — 4,869 (1) Corporate expenses primarily consist of consolidated stock-based compensation expense, compensation for corporate employees, acquisition, integration and strategic planning expenses, public company expenses, and depreciation expense for corporate assets. (2) During the quarter ended June 30, 2015, due to management changes, the Company realigned its former Life Sciences Europe Segment to be included in the Oxford Segment. Prior periods have been adjusted to reflect this change. The following table presents revenues by type (in thousands): Three Months Ended March 31, 2016 % 2015 % Revenues: Assignment $ 549,552 94.4 % $ 406,141 94.4 % Permanent placement 32,488 5.6 % 23,904 5.6 % $ 582,040 100.0 % $ 430,045 100.0 % The Company operates internationally, with operations mainly in the United States, Europe, and Canada. The following table presents revenues by geographic location (in thousands): Three Months Ended March 31, 2016 % 2015 % Revenues: Domestic $ 554,438 95.3 % $ 410,756 95.5 % Foreign 27,602 4.7 % 19,289 4.5 % $ 582,040 100.0 % $ 430,045 100.0 %

Acquisitions Acquisitions (Poli

Acquisitions Acquisitions (Policies)	3 Months Ended
	Mar. 31, 2016
Acquisitions [Abstract]
Acquisition [Policy Text Block]	Assets and liabilities of the acquired companies were recorded at their estimated fair values at the dates 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.

Fair Value Measurements (Polici

Fair Value Measurements (Policies)	3 Months Ended
	Mar. 31, 2016
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 March 31, 2016 was $723.2 million (net of $17.8 million of unamortized deferred loan costs, see "Note 6. Long-Term Debt "). The f air value of the long-term debt at that same date was $744.5 million as determined using the quoted price technique, based on Level 2 inputs (significant observable inputs other than quoted prices for identical assets in active markets) from the fair value hierarchy, and included the yields of comparable companies with similar credit characteristics .

Acquisitions Acquisitions (Tabl

Acquisitions Acquisitions (Tables)	3 Months Ended
	Mar. 31, 2016
Acquisitions [Abstract]
ScheduleOfPurchasePriceAllocationTableTextBlock [Table Text Block]	The Company's allocation of the purchase price of Creative Circle and LabResource has been finalized and the following table summarizes the allocations (in thousands): Creative Circle LabResource Cash $ 4,840 $ 187 Accounts receivable 34,386 1,643 Prepaid expenses and other current assets 4,462 — Property and equipment 5,077 12 Goodwill 358,029 6,449 Identifiable intangible assets 194,500 7,528 Other 651 — Total assets acquired $ 601,945 $ 15,819 Current liabilities $ 12,254 $ 1,482 Other — 1,882 Total liabilities assumed 12,254 3,364 Total purchase price (1) (2) $ 589,691 $ 12,455 (1) Excluding cash acquired and a $0.9 million adjustment for net working capital in excess of the targeted amount (thereby increasing the actual purchase price paid), the purchase price for Creative Circle was $584.0 million as described in the discussion above. (2) Excluding cash acquired and a $0.4 million adjustment for net working capital that was less than the targeted amount (thereby reducing the actual purchase price paid), the purchase price for LabResource was $12.7 million as described in the discussion above.
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]	The following table summarizes (in thousands) the allocation of the purchase price among the identifiable intangible assets for the acquisitions: Identifiable Intangible Asset Value Useful life Creative Circle LabResource Contractor relationships 2 - 4 years $ 29,500 $ 947 Customer relationships 2 - 10 years 90,700 5,421 Non-compete agreements 2 - 6 years 7,300 20 Favorable contracts 5 years 900 — Trademarks indefinite 66,100 1,140 Total identifiable intangible assets acquired $ 194,500 $ 7,528
Business Acquisition, Pro Forma Information [Table Text Block]	The summary below (in thousands, except for per share data) presents pro forma unaudited consolidated results of operations for the three months ended March 31, 2015 as if the acquisitions of Creative Circle and LabResource occurred on January 1, 2014. The pro forma financial information gives effect to certain adjustments, including amortization of intangible assets, interest expense on acquisition-related debt, provision for income taxes, and increased number of common shares as a result of the acquisitions. 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 acquisitions had been consummated as of the date indicated, nor are they necessarily indicative of future operating results. Revenues $ 494,708 Income from continuing operations $ 13,955 Net income $ 40,067 Basic earnings per share: Income from continuing operations $ 0.27 Net income $ 0.77 Diluted earnings per share: Income from continuing operations $ 0.26 Net income $ 0.76 Number of shares and share equivalents used to calculate earnings per share: Basic 52,314 Diluted 53,046

Discontinued Operations (Tables

Discontinued Operations (Tables)	3 Months Ended
	Mar. 31, 2016
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract]
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures [Table Text Block]	The cash flows that are attributable to the Physician Segment are as follows (in thousands): Three Months Ended March 31, 2016 2015 Net cash provided by (used in) operating activities $ 53 $ (1,778 ) Net cash provided by investing activities: Cash received from sale of discontinued operations, net $ 6,000 $ 114,884 Other — (14 ) Total cash provided by investing activities $ 6,000 $ 114,870 The following is a summary of the operating results of all of the Company's discontinued operations (in thousands): Three Months Ended March 31, 2016 2015 Revenues $ — $ 12,068 Costs of services — 8,653 Gross profit — 3,415 Selling, general and administrative expenses (85 ) 2,641 Amortization of intangible assets — 155 Income before income taxes 85 619 Provision for income taxes 32 210 Income from discontinued operations, net of income taxes $ 53 $ 409

Goodwill and Identifiable Ass23

Goodwill and Identifiable Assets (Tables)	3 Months Ended
	Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The changes in the carrying amount of goodwill for the year ended December 31, 2015 and the three months ended March 31, 2016 are as follows (in thousands): Apex Segment Oxford Segment Total Balance as of December 31, 2014 $ 287,951 $ 224,109 $ 512,060 Creative Circle Acquisition 358,029 — 358,029 LabResource Acquisition — 6,449 6,449 Translation adjustment (1,363 ) (269 ) (1,632 ) Balance as of December 31, 2015 644,617 230,289 874,906 Translation adjustment 355 396 751 Balance as of March 31, 2016 $ 644,972 $ 230,685 $ 875,657
Schedule of Acquired Intangible Assets	Acquired intangible assets consisted of the following (in thousands): As of March 31, 2016 As of December 31, 2015 Estimated Useful Life Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Subject to amortization: Customer relationships 2 - 10 years $ 196,780 $ 80,781 $ 115,999 $ 196,472 $ 74,640 $ 121,832 Contractor relationships 2 - 5 years 69,813 42,991 26,822 69,764 40,124 29,640 Non-compete agreements 2 - 7 years 10,889 3,626 7,263 10,874 3,163 7,711 In-use software 6 years 18,900 7,304 11,596 18,900 6,516 12,384 Favorable contracts 5 years 900 242 658 900 172 728 297,282 134,944 162,338 296,910 124,615 172,295 Not subject to amortization: Trademarks 245,761 — 245,761 245,630 — 245,630 Total $ 543,043 $ 134,944 $ 408,099 $ 542,540 $ 124,615 $ 417,925
Schedule of Estimated Future Amortization Expense	Estimated amortization expense for the remainder of this year, each of the next four years, and thereafter is as follows (in thousands): 2016 $ 29,515 2017 33,054 2018 28,928 2019 22,016 2020 14,515 Thereafter 34,310 $ 162,338

Long-Term Debt (Tables)

Long-Term Debt (Tables)	3 Months Ended
	Mar. 31, 2016
Debt Disclosure [Abstract]
Schedule of Long-term Debt	Long-term debt consisted of the following (in thousands): March 31, 2016 December 31, 2015 $150 million revolving credit facility, due June 2020 $ 34,000 $ 50,000 $825 million Term B loan facility, due June 2022 707,000 724,000 741,000 774,000 Unamortized deferred loan costs (17,781 ) (18,492 ) $ 723,219 $ 755,508

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2016
Fair Value Disclosures [Abstract]
Schedule of Reconciliations of Liabilities Measured and Carried at Fair Value on Recurring Basis, with Significant Unobservable Inputs	The following table summarizes the balance of the contingent consideration and changes for the periods presented (in thousands): Three Months Ended March 31, 2016 2015 Balance at beginning of period $ (20,981 ) $ (3,000 ) Additions for acquisitions — — Payments on contingent consideration — — Fair value adjustment (613 ) — Foreign currency translation adjustment — — Balance at end of period $ (21,594 ) $ (3,000 )

Earnings per share (Tables)

Earnings per share (Tables)	3 Months Ended
	Mar. 31, 2016
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, 2016 2015 Weighted average number of common shares outstanding used to compute basic earnings per share 53,147 51,519 Dilutive effect of stock-based awards 497 690 Number of shares used to compute diluted earnings per share 53,644 52,209

Segment Reporting (Tables)

Segment Reporting (Tables)	3 Months Ended
	Mar. 31, 2016
Segment Reporting Information [Line Items]
Schedule of Segment Reporting Information, by Segment	Three Months Ended March 31, 2016 Apex Oxford Corporate (1) Total Revenues $ 433,155 $ 148,885 $ — $ 582,040 Gross profit 126,144 61,638 — 187,782 Operating income 39,986 12,760 (14,989 ) 37,757 Amortization 8,590 1,554 — 10,144 Three Months Ended March 31, 2015 Apex Oxford (2) Corporate (1) Total Revenues $ 295,971 $ 134,074 $ — $ 430,045 Gross profit 80,152 55,723 — 135,875 Operating income 22,896 12,713 (10,538 ) 25,071 Amortization 3,522 1,347 — 4,869 (1) Corporate expenses primarily consist of consolidated stock-based compensation expense, compensation for corporate employees, acquisition, integration and strategic planning expenses, public company expenses, and depreciation expense for corporate assets. (2) During the quarter ended June 30, 2015, due to management changes, the Company realigned its former Life Sciences Europe Segment to be included in the Oxford Segment. Prior periods have been adjusted to reflect this change.
Revenue by Type [Table Text Block]	The following table presents revenues by type (in thousands): Three Months Ended March 31, 2016 % 2015 % Revenues: Assignment $ 549,552 94.4 % $ 406,141 94.4 % Permanent placement 32,488 5.6 % 23,904 5.6 % $ 582,040 100.0 % $ 430,045 100.0 %
Schedule of Revenue by Geographical Areas	The Company operates internationally, with operations mainly in the United States, Europe, and Canada. The following table presents revenues by geographic location (in thousands): Three Months Ended March 31, 2016 % 2015 % Revenues: Domestic $ 554,438 95.3 % $ 410,756 95.5 % Foreign 27,602 4.7 % 19,289 4.5 % $ 582,040 100.0 % $ 430,045 100.0 %

Acquisitions Acquisitions Costs

Acquisitions Acquisitions Costs, by Acquisition (Details) - USD ($) $ in Thousands	Jun. 05, 2015	Apr. 14, 2015	Jun. 30, 2015	Dec. 31, 2015
Business Acquisition [Line Items]
BusinessCombinationRecognizedGoodwill	$ 358,000
Creative Circle [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition	Jun. 5, 2015
Business Acquisition, Name of Acquired Entity	Creative Circle, LLC
Business Acquisition, Description of Acquired Entity	is headquartered in Los Angeles, California
Business Combination, Reason for Business Combination	was purchased to expand the Company’s technical and creative staffing services
Payments to Acquire Businesses, Gross	$ 540,000
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned	30,200
Stock Issued During Period, Shares, Acquisitions			794,700
Business Acquisition Contingent Consideration At Fair Value Accrued Earn-Out	13,800
BusinessCombinationRecognizedGoodwill	358,029
Business Combination, Acquisition Related Costs				$ 5,700
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	194,500
LabResource [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition		Apr. 14, 2015
Business Acquisition, Name of Acquired Entity		LabResource B.V.
Business Acquisition, Description of Acquired Entity		headquartered in Amsterdam, Netherlands
Business Combination, Reason for Business Combination		expand the Company's life sciences staffing business in Europe
Payments to Acquire Businesses, Gross		$ 12,700
BusinessCombinationRecognizedGoodwill		6,449
Business Combination, Acquisition Related Costs				$ 400
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill		7,528
Contractor Relations [Member] | Creative Circle [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	29,500
Contractor Relations [Member] | LabResource [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill		947
Customer relations | Creative Circle [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	90,700
Customer relations | LabResource [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill		5,421
Non-compete agreements | Creative Circle [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	7,300
Non-compete agreements | LabResource [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill		20
Contract-Based Intangible Assets [Member] | Creative Circle [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$ 900
Contract-Based Intangible Assets [Member] | LabResource [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill		$ 0

Acquisitions Schedule of Purcha

Acquisitions Schedule of Purchase Price Allocation (Details) - USD ($) $ in Thousands	Jun. 05, 2015	Apr. 14, 2015
Business Acquisition [Line Items]
BusinessCombinationRecognizedGoodwill	$ 358,000
Creative Circle [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	$ 4,840
Business Combination, Acquired Receivables, Description	34,386
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	$ 4,462
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	5,077
BusinessCombinationRecognizedGoodwill	358,029
Business Combination, Goodwill Recognized, Description	194,500
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	651
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	601,945
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities	12,254
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	12,254
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	$ 589,691
LabResource [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents		$ 187
Business Combination, Acquired Receivables, Description		1,643
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets		$ 0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment		12
BusinessCombinationRecognizedGoodwill		6,449
Business Combination, Goodwill Recognized, Description		7,528
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets		0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets		15,819
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities		1,482
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other		1,882
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities		3,364
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net		$ 12,455

Acquisitions Schedule of Intang

Acquisitions Schedule of Intangible Assets Acquired as Part of Business Combination (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Jun. 05, 2015	Apr. 14, 2015
Creative Circle [Member]
Acquired Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill		$ 194,500
Creative Circle [Member] | Trademarks [Member]
Acquired Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill		66,100
Creative Circle [Member] | Contractor Relations [Member]
Acquired Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill		29,500
Creative Circle [Member] | Customer relations
Acquired Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill		90,700
Creative Circle [Member] | Non-compete agreements
Acquired Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill		7,300
Creative Circle [Member] | Contract-Based Intangible Assets [Member]
Acquired Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill		$ 900
LabResource [Member]
Acquired Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill			$ 7,528
LabResource [Member] | Trademarks [Member]
Acquired Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill			1,140
LabResource [Member] | Contractor Relations [Member]
Acquired Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill			947
LabResource [Member] | Customer relations
Acquired Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill			5,421
LabResource [Member] | Non-compete agreements
Acquired Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill			20
LabResource [Member] | Contract-Based Intangible Assets [Member]
Acquired Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill			$ 0
Minimum [Member] | Contractor Relations [Member]
Acquired Intangible Assets [Line Items]
Acquired Finite Lived Intangible Assets Average Useful Life	2 years
Minimum [Member] | Customer relations
Acquired Intangible Assets [Line Items]
Acquired Finite Lived Intangible Assets Average Useful Life	2 years
Minimum [Member] | Non-compete agreements
Acquired Intangible Assets [Line Items]
Acquired Finite Lived Intangible Assets Average Useful Life	2 years
Minimum [Member] | Contract-Based Intangible Assets [Member]
Acquired Intangible Assets [Line Items]
Acquired Finite Lived Intangible Assets Average Useful Life	5 years
Minimum [Member] | Computer Software, Intangible Asset [Member]
Acquired Intangible Assets [Line Items]
Acquired Finite Lived Intangible Assets Average Useful Life	6 years
Maximum [Member] | Contractor Relations [Member]
Acquired Intangible Assets [Line Items]
Acquired Finite Lived Intangible Assets Average Useful Life	4 years
Maximum [Member] | Customer relations
Acquired Intangible Assets [Line Items]
Acquired Finite Lived Intangible Assets Average Useful Life	10 years
Maximum [Member] | Non-compete agreements
Acquired Intangible Assets [Line Items]
Acquired Finite Lived Intangible Assets Average Useful Life	6 years

Acquisitions Business Acquisiti

Acquisitions Business Acquisition, Pro Forma Information (Details) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2015USD ($)$ / sharesshares
Acquired Indefinite-lived Intangible Assets [Line Items]
Business Acquisition, Pro Forma Revenue | $	$ 494,708
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax | $	13,955
Business Acquisition, Pro Forma Net Income (Loss) | $	$ 40,067
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Basic	$ 0.27
Business Acquisition, Pro Forma Earnings Per Share, Basic	0.77
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Diluted	0.26
Business Acquisition, Pro Forma Earnings Per Share, Diluted	$ 0.76
Weighted Average Basic Shares Outstanding, Pro Forma | shares	52,314
Pro Forma Weighted Average Shares Outstanding, Diluted | shares	53,046

Discontinued Operations (Detail

Discontinued Operations (Details) - USD ($) $ in Thousands	Feb. 02, 2015	Mar. 31, 2016	Mar. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from discontinued operations, net of income taxes		$ 53	$ 409
Proceeds from Divestiture of Businesses	$ 123,000
Gain (Loss) on Disposition of Business		0	25,703
Discontinued Operation, Tax Effect of Gain (Loss) from Disposal of Discontinued Operation			14,400
Cash Provided by (Used in) Operating Activities, Discontinued Operations		53	(1,778)
Cash received from sale of discontinued operations, net		6,000	114,884
Other Cash Provided by (Used in) Investing Activities, Discontinued Operations		0	14
Cash Provided by (Used in) Investing Activities, Discontinued Operations		6,000	114,870
Disposal Group, Including Discontinued Operation, Revenue		0	12,068
Disposal Group Including Discontinued Operations Cost of Services		0	8,653
Disposal Group, Including Discontinued Operation, Gross Profit (Loss)		0	3,415
Disposal Group, Including Discontinued Operation, General and Administrative Expense		85	2,641
Disposal Group Including Discontinued Operations Amortization of Intangible Assets		0	155
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax		85	619
Discontinued Operation, Tax Effect of Discontinued Operation		$ 32	$ 210

Goodwill and Identifiable Ass33

Goodwill and Identifiable Assets (Goodwill) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Roll Forward]
Gross goodwill	$ 875,657	$ 874,906	$ 512,060
Goodwill	875,657	874,906
Translation adjustment	751	(1,632)
Apex
Goodwill [Roll Forward]
Gross goodwill	644,972	644,617	287,951
Translation adjustment	355	(1,363)
Oxford
Goodwill [Roll Forward]
Gross goodwill	230,685	230,289	$ 224,109
Translation adjustment	$ 396	(269)
Creative Circle [Member]
Goodwill [Roll Forward]
Goodwill, Acquired During Period		358,029
Creative Circle [Member] | Apex
Goodwill [Roll Forward]
Goodwill, Acquired During Period		358,029
Creative Circle [Member] | Oxford
Goodwill [Roll Forward]
Goodwill, Acquired During Period		0
LabResource [Member]
Goodwill [Roll Forward]
Goodwill, Acquired During Period		6,449
LabResource [Member] | Apex
Goodwill [Roll Forward]
Goodwill, Acquired During Period		0
LabResource [Member] | Oxford
Goodwill [Roll Forward]
Goodwill, Acquired During Period		$ 6,449

Goodwill and Identifiable Ass34

Goodwill and Identifiable Assets (Acquired Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Intangible Assets [Line Items]
Amortization of intangible assets	$ 10,144	$ 4,869
Intangible assets subject to amortization:
Gross Carrying Amount	297,282		$ 296,910
Accumulated Amortization	134,944		124,615
Net Carrying Amount	162,338		172,295
Intangible assets not subject to amortization:
Trademarks, Carrying Amount	245,761		245,630
Goodwill, Carrying Amount	875,657		874,906
Intangible Assets, Gross (Excluding Goodwill)	543,043		542,540
Total
Identifiable intangible assets, net	408,099		417,925
Customer relations
Intangible assets subject to amortization:
Gross Carrying Amount	196,780		196,472
Accumulated Amortization	80,781		74,640
Net Carrying Amount	$ 115,999		121,832
Customer relations | Minimum [Member]
Intangible Assets [Line Items]
Estimated Useful Life	2 years
Customer relations | Maximum [Member]
Intangible Assets [Line Items]
Estimated Useful Life	10 years
Contractor Relations [Member]
Intangible assets subject to amortization:
Gross Carrying Amount	$ 69,813		69,764
Accumulated Amortization	42,991		40,124
Net Carrying Amount	$ 26,822		29,640
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	5 years
Non-compete agreements
Intangible assets subject to amortization:
Gross Carrying Amount	$ 10,889		10,874
Accumulated Amortization	3,626		3,163
Net Carrying Amount	$ 7,263		7,711
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	5 years
Intangible assets subject to amortization:
Gross Carrying Amount	$ 18,900		18,900
Accumulated Amortization	7,304		6,516
Net Carrying Amount	$ 11,596		12,384
Contract-Based Intangible Assets [Member]
Intangible Assets [Line Items]
Estimated Useful Life	6 years
Intangible assets subject to amortization:
Gross Carrying Amount	$ 900		900
Accumulated Amortization	242		172
Net Carrying Amount	$ 658		$ 728

Goodwill and Identifiable Ass35

Goodwill and Identifiable Assets (Future Amortization Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 10,144	$ 4,869
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2,016	29,515
2,017	33,054
2,018	28,928
2,019	22,016
2,020	14,515
Thereafter	34,310
Net Carrying Amount	$ 162,338		$ 172,295

Long-Term Debt Long-Term Debt S

Long-Term Debt Long-Term Debt Schedule (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Secured Debt	$ 741,000	$ 774,000
Unamortized Debt Issuance Expense	(17,781)	(18,500)
Long-term Debt	723,219	755,508
$150 Million Revolving Credit Facility, Due June 2020 [Member]
Debt Instrument [Line Items]
Secured Debt	34,000	50,000
$825 Million Term B Loan Facility, due June 2022 [Member]
Debt Instrument [Line Items]
Secured Debt	$ 707,000	$ 724,000

Long-Term Debt Long-term Debt t

Long-Term Debt Long-term Debt text (Details) $ in Thousands	1 Months Ended	3 Months Ended
	Jun. 15, 2015Rate	Mar. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Jun. 05, 2015USD ($)
Debt Instrument [Line Items]
Unamortized Debt Issuance Expense		$ (17,781)	$ (18,500)
Debt, Weighted Average Interest Rate		3.71%
Contractual Quarterly Payments		$ 2,100
Payments on Debt		$ 134,000
Leverage Ratio		2.80
$825 Million Term B Loan Facility and $150 Million Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount				$ 975,000
$825 Million Term B Loan Facility, due June 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount				825,000
$150 Million Revolving Credit Facility, Due June 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount				$ 150,000
Maximum [Member]
Debt Instrument [Line Items]
Leverage Ratio		4.25
Leverage Ratio in Latest Year of Debt Term		3.25
Notes Payable to Banks [Member] | Minimum [Member] | $150 Million Revolving Credit Facility, Due June 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate | Rate	0.75%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | Rate	0.25%
Notes Payable to Banks [Member] | Maximum [Member] | $150 Million Revolving Credit Facility, Due June 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate | Rate	2.50%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | Rate	0.40%
Notes Payable to Banks [Member] | Maximum [Member] | Eurodollar [Member] | $825 Million Term B Loan Facility, due June 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate | Rate	3.00%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity		$ 112,500

Commitments and Contingencies (

Commitments and Contingencies (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016USD ($)property	Mar. 31, 2015USD ($)	Dec. 31, 2015USD ($)
Other Commitments [Line Items]
Costs and Expenses, Related Party	$ 300	$ 300
Number of Leased Properties Owned by Related Parties | property	2
Self Insurance Reserve	$ 1,600		$ 1,800
Workerscompensationreceivable	13,278		13,238
Letters of Credit Outstanding, Amount	$ 3,500		$ 3,500

Fair Value Measurements (Fair V

Fair Value Measurements (Fair Value Inputs, Liabilities, Quantitative Information) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Fair Value Inputs, Liabilities, Quantitative Information
Long-term Debt	$ 723,219	$ 755,508
Unamortized Debt Issuance Expense	(17,781)	(18,500)
Level 2 Inputs
Fair Value Inputs, Liabilities, Quantitative Information
Long-term debt, fair value	744,500
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3)
Fair Value Inputs, Liabilities, Quantitative Information
Obligations, Fair Value Disclosure	$ (21,600)	$ (21,000)

Fair Value Measurements (Liabil

Fair Value Measurements (Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Contingent consideration for acquisitions
Balance at beginning of period	$ (20,981)	$ (3,000)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Payments	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	613	0
Foreign currency translation adjustment	0	0
Balance at end of period	$ (21,594)	$ (3,000)

Accumulated Other Comprehensi41

Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Accumulated Other Comprehensive Income [Abstract]
Accumulated other comprehensive loss	$ (6,819)		$ (8,162)
Foreign currency translation adjustment	1,343	$ (3,724)
Changes in fair value of derivative, net of tax	$ 0	$ 47

Stock-based compensation (Detai

Stock-based compensation (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Deferred Compensation Arrangement with Individual, Share-based Payments
Allocated Share-based Compensation Expense	$ 6.9	$ 4
2010 Employee Stock Purchase Plan (ESPP)
Deferred Compensation Arrangement with Individual, Share-based Payments
Employee stock purchase plan shares issued during period	128,518

Earnings per share (Details)

Earnings per share (Details) - shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	473,000
Weighted Average Number of Shares Outstanding Reconciliation
Weighted average number of common shares outstanding used to compute basic earnings per share	53,147,000	51,519,000
Dilutive effect of stock-based awards	497,000	690,000
Number of shares used to compute diluted earnings per share	53,644,000	52,209,000

Segment Reporting (Segment Repo

Segment Reporting (Segment Reporting Information) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016USD ($)segment	Mar. 31, 2015USD ($)
Revenues:
Revenues	$ 582,040	$ 430,045
Revenue as Percentage of Consolidated Revenue	100.00%	100.00%
Gross Profit:
Total Gross Profit	$ 187,782	$ 135,875
Operating Income (Loss):
Total Operating Income	37,757	25,071
Amortization of Intangible Assets	$ 10,144	4,869
Reportable segments (in number of segments) | segment	2
Apex
Revenues:
Revenues	$ 433,155	295,971
Gross Profit:
Total Gross Profit	126,144	80,152
Operating Income (Loss):
Total Operating Income	39,986	22,896
Amortization of Intangible Assets	8,590	3,522
Oxford
Revenues:
Revenues	148,885	134,074
Gross Profit:
Total Gross Profit	61,638	55,723
Operating Income (Loss):
Total Operating Income	12,760	12,713
Amortization of Intangible Assets	1,554	1,347
Corporate Segment [Member]
Operating Income (Loss):
Total Operating Income	(14,989)	(10,538)
Amortization of Intangible Assets	0	0
Assignment [Member]
Revenues:
Revenues	$ 549,552	$ 406,141
Revenue as Percentage of Consolidated Revenue	94.40%	94.40%
PermanentPlacement [Member]
Revenues:
Revenues	$ 32,488	$ 23,904
Revenue as Percentage of Consolidated Revenue	5.60%	5.60%

Segment Reporting (Revenue by G

Segment Reporting (Revenue by Geographical Areas) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenues from External Customers [Line Items]
Revenues	$ 582,040	$ 430,045
Revenue as Percentage of Consolidated Revenue	100.00%	100.00%
Domestic [Member]
Revenues from External Customers [Line Items]
Revenues	$ 554,438	$ 410,756
Revenue as Percentage of Consolidated Revenue	95.30%	95.50%
Foreign [Member]
Revenues from External Customers [Line Items]
Revenues	$ 27,602	$ 19,289
Revenue as Percentage of Consolidated Revenue	4.70%	4.50%