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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, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net service revenues | $ 1,346,282 | $ 1,324,709 | $ 1,308,428 | $ 1,287,370 | $ 1,265,073 | $ 1,338,541 | $ 1,344,160 | $ 1,302,625 | $ 5,266,789 | $ 5,250,399 | $ 5,094,933
Amortization of intangible assets |  |  |  |  |  |  |  |  | 1,563 | 1,237 | 192
Interest income, net |  |  |  |  |  |  |  |  | (1,799) | (888) | (550)
Income before income taxes | $ 129,038 | $ 132,270 | $ 130,707 | $ 125,501 | $ 124,581 | $ 146,324 | $ 149,414 | $ 133,791 | 517,516 | 554,110 | 581,030
Operating segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net service revenues |  |  |  |  |  |  |  |  | 5,266,789 | 5,250,399 | 5,094,933
Operating income |  |  |  |  |  |  |  |  | 517,280 | 554,459 | 580,672
Operating segments | Temporary and consultant staffing |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net service revenues |  |  |  |  |  |  |  |  | 4,011,042 | 4,026,777 | 3,930,843
Operating income |  |  |  |  |  |  |  |  | 355,700 | 393,704 | 399,808
Operating segments | Permanent placement staffing |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net service revenues |  |  |  |  |  |  |  |  | 439,214 | 419,314 | 421,411
Operating income |  |  |  |  |  |  |  |  | 77,673 | 80,001 | 85,019
Operating segments | Risk consulting and internal audit services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net service revenues |  |  |  |  |  |  |  |  | 816,533 | 804,308 | 742,679
Operating income |  |  |  |  |  |  |  |  | 83,907 | 80,754 | 95,845
Segment reconciling items |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  |  |  |  |  |  | 1,563 | 1,237 | 192
Interest income, net |  |  |  |  |  |  |  |  | $ (1,799) | $ (888) | $ (550)

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