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Segment Reporting (Segment Reporting Information) (Details) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2016 USD ($) segment | Mar. 31, 2015 USD ($)
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%

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