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Description of Business and Significant Accounting Policies - Correction of Immaterial Errors (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
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 446,960 | $ 455,606 | $ 462,101 | $ 476,111 | $ 494,952 | $ 505,500 | $ 501,587 | $ 500,562 | $ 1,840,778 | $ 2,002,601 | $ 1,861,206
Costs of services provided |  |  |  |  |  |  |  |  | 1,612,877 | 1,768,162 | 1,610,590
(Loss) income before income taxes | $ 25,871 | $ 23,716 | $ 23,617 | $ 11,892 | $ 35,007 | $ 32,982 | $ 33,316 | $ (1,395) | $ 85,096 | 99,910 | 132,965
Adjustment for captive insurance company |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 6,200 | 4,900
Costs of services provided |  |  |  |  |  |  |  |  |  | 3,800 | 1,900
(Loss) income before income taxes |  |  |  |  |  |  |  |  |  | $ 2,400 | $ 3,000

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