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Acquisitions Acquisitions Costs, by Acquisition (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 05, 2015 | Apr. 14, 2015 | Sep. 30, 2015 | Sep. 30, 2014 | Jun. 30, 2015 | Sep. 30, 2015 | Sep. 30, 2014
Business Acquisition [Line Items] |  |  |  |  |  |  |
Write off of Deferred Debt Issuance Cost |  |  | $ 0 | $ 0 |  | $ 3,751 | $ 0
Business Combination, Acquisition Related Costs |  |  |  |  |  | 6,100 |
Potential future earn-out obligations |  |  | 41,000 |  |  | 41,000 |
Stock Issued During Period, Value, Acquisitions |  |  |  |  | $ 30,200 | $ 30,200 |
Stock Issued During Period, Shares, Acquisitions |  |  |  |  | 794,700 | 794,700 |
Sales Revenue, Services, Net |  |  | 572,123 | 442,443 |  | $ 1,487,491 | 1,283,718
Operating Income (Loss) |  |  | $ 51,465 | $ 38,698 |  | 109,246 | $ 101,975
Creative Circle [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
BusinessCombinationRecognizedGoodwill | $ 358,460 |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | 194,500 |  |  |  |  |  |
Business Acquisition, Goodwill, Expected Tax Deductible Amount | $ 348,900 |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  |  | 5,700 |
Business Acquisition, Effective Date of Acquisition | Jun. 05, 2015 |  |  |  |  |  |
Potential future earn-out obligations | $ 30,000 |  |  |  |  |  |
Business Acquisition, Name of Acquired Entity | Creative Circle, LLC |  |  |  |  |  |
Business Acquisition, Description of Acquired Entity | is headquartered in Los Angeles, California |  |  |  |  |  |
Business Combination, Consideration Transferred | $ 540,900 |  |  |  |  |  |
Business Combination, Consideration Transferred, Other | $ 900 |  |  |  |  |  |
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 | 30,000 |  |  |  |  |  |
Sales Revenue, Services, Net |  |  |  |  | $ 92,600 |  |
Operating Income (Loss) |  |  |  |  | 12,800 |  |
LabResource [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
BusinessCombinationRecognizedGoodwill |  | $ 6,104 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  | $ 7,528 |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  |  | $ 400 |
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 |  |  |  |  |
Sales Revenue, Services, Net |  |  |  |  | 4,900 |  |
Operating Income (Loss) |  |  |  |  | $ 700 |  |
Contractor Relations [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquired Finite Lived Intangible Assets Average Useful Life |  |  |  |  |  | 4 years |
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 |  |  |  |  |
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] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquired Finite Lived Intangible Assets Average Useful Life |  |  |  |  |  | 5 years |
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 |  |  |  |  |
Customer relations |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquired Finite Lived Intangible Assets Average Useful Life |  |  |  |  |  | 10 years |
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 |  |  |  |  |
Maximum [Member] | Non-compete agreements |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquired Finite Lived Intangible Assets Average Useful Life |  |  |  |  |  | 6 years |
Minimum [Member] | Non-compete agreements |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquired Finite Lived Intangible Assets Average Useful Life |  |  |  |  |  | 2 years |

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- Definition With respect to a business combination completed during the period, this element provides a description of the business, other than the name, which may include the industry, size, products and other important information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + Details
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- Definition Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e1043-128460 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition Amount of tangible or intangible assets, including a business or subsidiary of the acquirer transferred by the entity to the former owners of the acquiree. Excludes cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition This element represents a description of the primary reason for the business combination which may consist of general categories such as top-line growth, synergistic benefits, market share, and diversification and the more detailed factors that might apply. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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