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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, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Workers Compensation Reserve [Abstract] |  |  |  |
Workers' compensation claims liabilities, Beginning balance | $ 315,733 | $ 336,504 | $ 357,746 | $ 438,986
Add: claims expense accrual |  |  |  |
Current period | 2,394 | 35,138 | 71,407 | 106,359
Prior periods | (823) | (2,977) | (7,486) | (5,163)
Total expense accrual | 1,571 | 32,161 | 63,921 | 101,196
Less: claim payments related to |  |  |  |
Current period | 6,149 | 7,046 | 11,129 | 13,123
Prior periods | 14,018 | 15,640 | 113,022 | 181,170
Total paid | 20,167 | 22,686 | 124,151 | 194,293
Change in claims incurred in excess of retention limits | (138) | 1,369 | (517) | 1,459
Workers' compensation claims liabilities, Ending balance | 296,999 | 347,348 | 296,999 | 347,348
Incurred but not reported (IBNR) | $ 162,382 | $ 203,595 | $ 162,382 | $ 203,595
Ratio of IBNR to workers' compensation claims liabilities | 55.00% | 59.00% | 55.00% | 59.00%

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