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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Workers Compensation Reserve [Abstract]        
Workers' compensation claims liabilities, Beginning balance $ 262,646 $ 362,663 $ 279,407 $ 357,746
Add: claims expense accrual        
Current period 4,541 35,743 8,825 69,013
Prior periods (6,458) (5,483) (9,377) (6,663)
Total expense accrual (1,917) 30,260 (552) 62,350
Less: claim payments related to        
Current period 803 3,927 1,028 4,979
Prior periods 18,257 73,240 36,291 99,005
Total paid 19,060 77,167 37,319 103,984
Change in claims incurred in excess of retention limits (159) (23) (26) (379)
Workers' compensation claims liabilities, Ending balance 241,510 315,733 241,510 315,733
Incurred but not reported (IBNR) $ 124,320 $ 190,818 $ 124,320 $ 190,818
Ratio of IBNR to workers' compensation claims liabilities 51.00% 60.00% 51.00% 60.00%