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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, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net service revenues | $ 1,304,594 | $ 1,312,718 | $ 1,272,058 | $ 1,205,563 | $ 1,221,450 | $ 1,224,308 | $ 1,164,914 | $ 1,084,342 | $ 5,094,933 | $ 4,695,014 | $ 4,245,895
Amortization of intangible assets |  |  |  |  |  |  |  |  | 192 | 557 | 1,700
Interest income, net |  |  |  |  |  |  |  |  | (550) | (724) | (1,002)
Income before income taxes | $ 144,315 | $ 159,306 | $ 149,235 | $ 128,174 | $ 133,321 | $ 138,361 | $ 123,653 | $ 102,014 | 581,030 | 497,349 | 397,579
Operating segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net service revenues |  |  |  |  |  |  |  |  | 5,094,933 | 4,695,014 | 4,245,895
Operating income |  |  |  |  |  |  |  |  | 580,672 | 497,182 | 398,277
Operating segments | Temporary and consultant staffing |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net service revenues |  |  |  |  |  |  |  |  | 3,930,843 | 3,676,281 | 3,369,840
Operating income |  |  |  |  |  |  |  |  | 399,808 | 358,533 | 301,185
Operating segments | Permanent placement staffing |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net service revenues |  |  |  |  |  |  |  |  | 421,411 | 394,515 | 347,715
Operating income |  |  |  |  |  |  |  |  | 85,019 | 78,333 | 54,390
Operating segments | Risk consulting and internal audit services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net service revenues |  |  |  |  |  |  |  |  | 742,679 | 624,218 | 528,340
Operating income |  |  |  |  |  |  |  |  | 95,845 | 60,316 | 42,702
Segment reconciling items |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  |  |  |  |  |  | 192 | 557 | 1,700
Interest income, net |  |  |  |  |  |  |  |  | $ (550) | $ (724) | $ (1,002)

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