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Basis of Presentation and Significant Accounting Policies - Schedule of Amounts Reclassified from Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Revenues $ 725,515 $ 589,989 $ 612,445 $ 568,360 $ 624,177 $ 523,711 $ 554,208 $ 530,738 $ 2,496,309 $ 2,232,834 $ 2,124,074
Cost of operations                 (1,875,716) (1,680,899) (1,573,797)
Total before tax                 321,400 314,377 395,713
Other – net                 (16,982) 1,458 85,207
Provision for Income Taxes                 (75,079) (75,757) (89,425)
Net income                 246,321 238,620 306,288
Accumulated Other Comprehensive Income Component Recognized                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Net income                 (2,405) (3,158) (2,597)
Accumulated Other Comprehensive Income Component Recognized | Realized (loss) gain on derivative financial instruments                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Revenues                 (72) (370) 307
Cost of operations                 427 (343) (712)
Total before tax                 355 (713) (405)
Provision for Income Taxes                 (91) 181 103
Net income                 264 (532) (302)
Accumulated Other Comprehensive Income Component Recognized | Amortization of prior service cost on benefit obligations                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Other – net                 (3,278) (3,283) (2,919)
Provision for Income Taxes                 609 657 624
Net income                 $ (2,669) $ (2,626) $ (2,295)