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Workers' Compensation Claims - Summarizes Aggregate Workers' Compensation Reserve Activity (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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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%

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