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Workers' Compensation Claims - Summarizes Aggregate Workers' Compensation Reserve Activity (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Workers Compensation Reserve [Abstract] |  |  |  |
Workers' compensation claims liabilities, Beginning balance | $ 241,510 | $ 315,733 | $ 279,407 | $ 357,746
Add: claims expense accrual |  |  |  |
Current period | 4,854 | 2,394 | 13,678 | 71,407
Prior periods | (1,360) | (823) | (10,737) | (7,486)
Total expense accrual | 3,494 | 1,571 | 2,941 | 63,921
Less: claim payments related to |  |  |  |
Current period | 1,714 | 6,149 | 2,742 | 11,129
Prior periods | 16,846 | 14,018 | 53,136 | 113,022
Total paid | 18,560 | 20,167 | 55,878 | 124,151
Change in claims incurred in excess of retention limits | 899 | (138) | 873 | (517)
Workers' compensation claims liabilities, Ending balance | 227,343 | 296,999 | 227,343 | 296,999
Incurred but not reported (IBNR) | $ 117,587 | $ 162,382 | $ 117,587 | $ 162,382
Ratio of IBNR to workers' compensation claims liabilities | 52.00% | 55.00% | 52.00% | 55.00%

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