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Segment Reporting (Revenue by Geographical Areas) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Revenues from External Customers [Line Items] |  |  |  |
Revenues | $ 572,123 | $ 442,443 | $ 1,487,491 | $ 1,283,718
Revenue as Percentage of Consolidated Revenue | 100.00% | 100.00% | 100.00% | 100.00%
Domestic [Member] |  |  |  |
Revenues from External Customers [Line Items] |  |  |  |
Revenues | $ 546,747 | $ 421,640 | $ 1,420,492 | $ 1,223,217
Revenue as Percentage of Consolidated Revenue | 95.60% | 95.30% | 95.50% | 95.30%
Foreign [Member] |  |  |  |
Revenues from External Customers [Line Items] |  |  |  |
Revenues | $ 25,376 | $ 20,803 | $ 66,999 | $ 60,501
Revenue as Percentage of Consolidated Revenue | 4.40% | 4.70% | 4.50% | 4.70%
Assignment [Member] |  |  |  |
Revenues from External Customers [Line Items] |  |  |  |
Revenues | $ 539,383 | $ 419,990 | $ 1,402,116 | $ 1,220,800
Revenue as Percentage of Consolidated Revenue | 94.30% | 94.90% | 94.30% | 95.10%
Direct hire and conversion fees [Member] |  |  |  |
Revenues from External Customers [Line Items] |  |  |  |
Revenues | $ 32,740 | $ 22,453 | $ 85,375 | $ 62,918
Revenue as Percentage of Consolidated Revenue | 5.70% | 5.10% | 5.70% | 4.90%

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