Workers' Compensation Claims - Summarizes Aggregate Workers' Compensation Reserve Activity (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Workers Compensation Reserve [Abstract]
Workers' compensation claims liabilities, Beginning balance	$ 215,987	$ 279,407
Add: claims expense accrual
Current period	4,362	4,284
Prior periods	(1,114)	(2,919)
Total expense accrual	3,248	1,365
Less: claim payments related to
Current period	180	225
Prior periods	17,480	18,034
Total paid	17,660	18,259
Change in claims incurred in excess of retention limits	66	133
Workers' compensation claims liabilities, Ending balance	201,641	262,646
Incurred but not reported (IBNR)	$ 103,804	$ 138,604
Ratio of IBNR to workers' compensation claims liabilities	51.00%	53.00%