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Segment Reporting (Revenue by Geographical Areas) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Revenues from External Customers [Line Items] |  |  |  |
Revenues | $ 485,323 | $ 434,424 | $ 915,368 | $ 841,275
Revenue as Percentage of Consolidated Revenue | 100.00% | 100.00% | 100.00% | 100.00%
Domestic [Member] |  |  |  |
Revenues from External Customers [Line Items] |  |  |  |
Revenues | $ 462,989 | $ 414,624 | $ 873,745 | $ 801,577
Revenue as Percentage of Consolidated Revenue | 95.40% | 95.40% | 95.50% | 95.30%
Foreign [Member] |  |  |  |
Revenues from External Customers [Line Items] |  |  |  |
Revenues | $ 22,334 | $ 19,800 | $ 41,623 | $ 39,698
Revenue as Percentage of Consolidated Revenue | 4.60% | 4.60% | 4.50% | 4.70%
Assignment [Member] |  |  |  |
Revenues from External Customers [Line Items] |  |  |  |
Revenues | $ 456,592 | $ 412,953 | $ 862,733 | $ 800,810
Revenue as Percentage of Consolidated Revenue | 94.10% | 95.10% | 94.20% | 95.20%
Direct hire and conversion fees [Member] |  |  |  |
Revenues from External Customers [Line Items] |  |  |  |
Revenues | $ 28,731 | $ 21,471 | $ 52,635 | $ 40,465
Revenue as Percentage of Consolidated Revenue | 5.90% | 4.90% | 5.80% | 4.80%

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