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Business Segments (Segment Reporting Information) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 30, 2014 USD ($) | Jun. 30, 2014 USD ($) | Mar. 31, 2014 USD ($) | Dec. 31, 2015 USD ($) property | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 577,517 | $ 572,123 | $ 485,323 | $ 430,045 | $ 441,023 | $ 442,443 | $ 434,424 | $ 406,851 | $ 2,065,008 | $ 1,724,741 | $ 1,523,101
Gross profit | $ 192,932 | $ 191,404 | $ 158,534 | $ 135,875 | $ 142,537 | $ 144,838 | $ 141,905 | $ 128,155 | 678,745 | 557,435 | 454,875
Operating Income |  |  |  |  |  |  |  |  | 152,108 | 137,782 | 116,587
Amortization of intangible assets |  |  |  |  |  |  |  |  | $ 34,467 | 22,130 | 20,943
Reportable segments (in number of segments) | property |  |  |  |  |  |  |  |  | 2 |  |
Apex |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 1,487,042 | 1,190,052 | 1,059,993
Gross profit |  |  |  |  |  |  |  |  | 437,507 | 335,322 | 294,611
Operating Income |  |  |  |  |  |  |  |  | 151,559 | 121,334 | 98,588
Amortization of intangible assets |  |  |  |  |  |  |  |  | 28,371 | 16,356 | 19,524
Oxford |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 577,966 | 534,689 | 463,108
Gross profit |  |  |  |  |  |  |  |  | 241,238 | 222,113 | 160,264
Operating Income |  |  |  |  |  |  |  |  | 70,385 | 70,193 | 66,118
Amortization of intangible assets |  |  |  |  |  |  |  |  | 6,096 | 5,765 | 1,329
Corporate |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Operating Income |  |  |  |  |  |  |  |  | (69,836) | (53,745) | (48,119)
Amortization of intangible assets |  |  |  |  |  |  |  |  | 0 | 9 | 90
Assignment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,947,001 | 1,641,706 | 1,500,157
Direct hire and conversion fees [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 118,007 | $ 83,035 | $ 22,944

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