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Business Segments - Reconciliation of Revenue and Operating Income by Reportable Segment to Consolidated Results (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |  |
Service revenues | $ 6,461,444 | $ 5,109,000 | $ 6,074,432
Operating income | 805,824 | 421,758 | 621,751
Amortization of intangible assets | 2,241 | 1,219 | 1,361
Interest income, net | (197) | (1,343) | (5,125)
Income before income taxes | 803,780 | 421,882 | 625,515
Temporary and consultant staffing |  |  |
Segment Reporting Information [Line Items] |  |  |
Service revenues | 4,038,743 | 3,477,335 | 4,412,125
Operating income | 393,872 | 237,279 | 410,153
Permanent placement staffing |  |  |
Segment Reporting Information [Line Items] |  |  |
Service revenues | 569,921 | 370,109 | 533,432
Operating income | 106,465 | 28,799 | 83,885
Risk consulting and internal audit services |  |  |
Segment Reporting Information [Line Items] |  |  |
Service revenues | 1,852,780 | 1,261,556 | 1,128,875
Operating income | $ 305,487 | $ 155,680 | $ 127,713

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