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Workers' Compensation Claims - Summarizes Aggregate Workers' Compensation Reserve Activity (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Workers Compensation Reserve [Abstract]        
Workers' compensation claims liabilities, Beginning balance $ 191,823 $ 241,510 $ 215,987 $ 279,407
Add: claims expense accrual        
Current period 3,792 4,854 11,636 13,678
Prior periods (4,098) (1,360) (6,792) (10,737)
Total expense accrual (306) 3,494 4,844 2,941
Less: claim payments related to        
Current period 1,240 1,714 2,005 2,742
Prior periods 12,244 16,846 41,532 53,136
Total paid 13,484 18,560 43,537 55,878
Change in claims incurred in excess of retention limits (231) 899 508 873
Workers' compensation claims liabilities, Ending balance 177,802 227,343 177,802 227,343
Incurred but not reported (IBNR) $ 82,076 $ 117,587 $ 82,076 $ 117,587
Ratio of IBNR to workers' compensation claims liabilities 46.00% 52.00% 46.00% 52.00%