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Business Segments - Reconciliation of Revenue and Operating Income by Reportable Segment to Consolidated Results (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net service revenues | $ 1,265,073 | $ 1,338,541 | $ 1,344,160 | $ 1,302,625 | $ 1,304,594 | $ 1,312,718 | $ 1,272,058 | $ 1,205,563 | $ 5,250,399 | $ 5,094,933 | $ 4,695,014
Amortization of intangible assets |  |  |  |  |  |  |  |  | 1,237 | 192 | 557
Interest income, net |  |  |  |  |  |  |  |  | (888) | (550) | (724)
Income before income taxes | $ 124,581 | $ 146,324 | $ 149,414 | $ 133,791 | $ 144,315 | $ 159,306 | $ 149,235 | $ 128,174 | 554,110 | 581,030 | 497,349
Operating segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net service revenues |  |  |  |  |  |  |  |  | 5,250,399 | 5,094,933 | 4,695,014
Operating income |  |  |  |  |  |  |  |  | 554,459 | 580,672 | 497,182
Operating segments | Temporary and consultant staffing |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net service revenues |  |  |  |  |  |  |  |  | 4,026,777 | 3,930,843 | 3,676,281
Operating income |  |  |  |  |  |  |  |  | 393,704 | 399,808 | 358,533
Operating segments | Permanent placement staffing |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net service revenues |  |  |  |  |  |  |  |  | 419,314 | 421,411 | 394,515
Operating income |  |  |  |  |  |  |  |  | 80,001 | 85,019 | 78,333
Operating segments | Risk consulting and internal audit services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net service revenues |  |  |  |  |  |  |  |  | 804,308 | 742,679 | 624,218
Operating income |  |  |  |  |  |  |  |  | 80,754 | 95,845 | 60,316
Segment reconciling items |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  |  |  |  |  |  | 1,237 | 192 | 557
Interest income, net |  |  |  |  |  |  |  |  | $ (888) | $ (550) | $ (724)

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