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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, 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%

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