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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, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Service revenues | $ 1,537,385 | $ 1,552,132 | $ 1,516,385 | $ 1,468,530 | $ 1,481,658 | $ 1,466,226 | $ 1,457,054 | $ 1,395,333 | $ 6,074,432 | $ 5,800,271 | $ 5,266,789
Operating income |  |  |  |  |  |  |  |  | 621,751 | 588,925 | 517,280
Amortization of intangible assets |  |  |  |  |  |  |  |  | 1,361 | 1,705 | 1,563
Interest income, net |  |  |  |  |  |  |  |  | (5,125) | (4,382) | (1,799)
Income before income taxes | $ 154,247 | $ 163,782 | $ 160,103 | $ 147,383 | $ 154,983 | $ 151,905 | $ 150,075 | $ 134,639 | 625,515 | 591,602 | 517,516
Temporary and consultant staffing |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Service revenues |  |  |  |  |  |  |  |  | 4,412,125 | 4,330,566 | 4,011,042
Operating income |  |  |  |  |  |  |  |  | 410,153 | 404,800 | 355,700
Permanent placement staffing |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Service revenues |  |  |  |  |  |  |  |  | 533,432 | 511,989 | 439,214
Operating income |  |  |  |  |  |  |  |  | 83,885 | 90,801 | 77,673
Risk consulting and internal audit services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Service revenues |  |  |  |  |  |  |  |  | 1,128,875 | 957,716 | 816,533
Operating income |  |  |  |  |  |  |  |  | $ 127,713 | $ 93,324 | $ 83,907

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