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Business Segments - Reconciliation of Revenue and Operating Income by Reportable Segment (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Segment Reporting Information [Line Items] |  |
Service revenues | $ 1,398,380 | $ 1,506,691
Segment income | 150,637 | 131,144
Amortization of intangible assets | 576 | 338
Interest income, net | (45) | (957)
Income before income taxes | 150,106 | 131,763
Temporary and consultant staffing |  |
Segment Reporting Information [Line Items] |  |
Service revenues | 889,275 | 1,092,120
Segment income | 75,535 | 93,764
Permanent placement staffing |  |
Segment Reporting Information [Line Items] |  |
Service revenues | 111,703 | 120,489
Segment income | 17,780 | 10,911
Risk consulting and internal audit services |  |
Segment Reporting Information [Line Items] |  |
Service revenues | 397,402 | 294,082
Segment income | $ 57,322 | $ 26,469

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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