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Acquisitions Acquisitions (Acquisition Costs, by Acquisition) (Details) - USD ($) |  |  | 1 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jun. 05, 2015 | Apr. 14, 2015 | Dec. 31, 2013 | Jun. 30, 2015 | Dec. 31, 2015 | Dec. 31, 2013 | Dec. 05, 2013
Business Acquisition [Line Items] |  |  |  |  |  |  |
Stock Issued During Period, Value, Acquisitions |  |  |  |  | $ 30,183,000 |  |
Stock Issued During Period, Shares, Acquisitions |  |  |  |  | 794,700 |  |
Creative Circle [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition | Jun. 05, 2015 |  |  |  |  |  |
Business Acquisition, Name of Acquired Entity | Creative Circle. |  |  |  |  |  |
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 | $ 540,000,000 |  |  |  |  |  |
Stock Issued During Period, Value, Acquisitions |  |  |  | $ 30,200,000 |  |  |
Stock Issued During Period, Shares, Acquisitions |  |  |  | 794,700,000 |  |  |
Business Acquisition, Goodwill, Expected Tax Deductible Amount | 358,029,000 |  |  |  |  |  |
Business Acquisition Contingent Consideration At Fair Value Accrued Earn-Out | $ 13,800,000 |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  | $ 5,700,000 |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  |  |  |  | 167,200,000 |  |
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual |  |  |  |  | 22,900,000 |  |
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 |  | $ 12,700,000 |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  | 400,000 |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  |  |  |  | 7,700,000 |  |
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual |  |  |  |  | $ 1,000,000 |  |
CyberCoders [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition |  |  | Dec. 05, 2013 |  |  |  |
Business Acquisition, Name of Acquired Entity |  |  | CyberCoders |  |  |  |
Business Acquisition, Description of Acquired Entity |  |  | a provider of permanent placement services headquartered in Irvine, California. |  |  |  |
Business Combination, Reason for Business Combination |  |  | The primary reason for the acquisition was to expand the Company's permanent placement services. |  |  |  |
Payments to Acquire Businesses, Gross |  |  | $ 93,600,000 |  |  |  |
Business Combination, Consideration Transferred |  |  | 96,600,000 |  |  |  |
Business Acquisition, Goodwill, Expected Tax Deductible Amount |  |  |  |  |  |  | $ 10,300,000
Business Acquisition Contingent Consideration At Fair Value Accrued Earn-Out |  |  | $ 3,000,000 |  |  |  |
contingent consideration maximum |  |  |  |  |  |  | $ 11,000,000
Business Combination, Acquisition Related Costs |  |  |  |  |  | $ 1,500,000 |

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- Definition For contingent consideration arrangements recognized in connection with a business combination, this element represents the maximum amount of consideration which may be paid. + References No definition available. + Details
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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 Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e845-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Acquisition Date -URI http://asc.fasb.org/extlink&oid=6919109 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e848-128460 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + 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 This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + Details
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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + 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 The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 + Details
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- Definition Number of shares of stock issued during the period pursuant to acquisitions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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