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Workers' Compensation Claims - Summarizes Aggregate Workers' Compensation Reserve Activity (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Workers Compensation Reserve [Abstract] |  |  |
Workers' compensation claims liabilities, Beginning balance | $ 357,746 | $ 438,986 | $ 413,397
Add: claims expense accrual |  |  |
Current period | 75,786 | 147,097 | 161,691
Prior periods | (9,225) | (6,383) | (13,355)
Total expense accrual | 66,561 | 140,714 | 148,336
Less: claim payments related to |  |  |
Current period | 15,063 | 22,877 | 24,414
Prior periods | 129,138 | 198,620 | 98,445
Total paid | 144,201 | 221,497 | 122,859
Change in claims incurred in excess of retention limits | (699) | (457) | 112
Workers' compensation claims liabilities, Ending balance | 279,407 | 357,746 | 438,986
Incurred but not reported (IBNR) | $ 153,838 | $ 210,798 | $ 285,191
Ratio of IBNR to workers' compensation claims liabilities | 55.00% | 59.00% | 65.00%

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