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Workers' Compensation Claims - Summarizes Aggregate Workers' Compensation Reserve Activity (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Workers Compensation Reserve [Abstract]        
Workers' compensation claims liabilities, Beginning balance $ 201,641 $ 262,646 $ 215,987 $ 279,407
Add: claims expense accrual        
Current period 3,482 4,541 7,844 8,825
Prior periods (1,580) (6,458) (2,694) (9,377)
Total expense accrual 1,902 (1,917) 5,150 (552)
Less: claim payments related to        
Current period 585 803 765 1,028
Prior periods 11,807 18,257 29,287 36,291
Total paid 12,392 19,060 30,052 37,319
Change in claims incurred in excess of retention limits 671 (159) 737 (26)
Workers' compensation claims liabilities, Ending balance 191,822 241,510 191,822 241,510
Incurred but not reported (IBNR) $ 90,053 $ 124,320 $ 90,053 $ 124,320
Ratio of IBNR to workers' compensation claims liabilities 47.00% 51.00% 47.00% 51.00%