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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, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Workers Compensation Reserve [Abstract] |  |  |  |
Workers' compensation claims liabilities, Beginning balance | $ 191,823 | $ 241,510 | $ 215,987 | $ 279,407
Add: claims expense accrual |  |  |  |
Current period | 3,792 | 4,854 | 11,636 | 13,678
Prior periods | (4,098) | (1,360) | (6,792) | (10,737)
Total expense accrual | (306) | 3,494 | 4,844 | 2,941
Less: claim payments related to |  |  |  |
Current period | 1,240 | 1,714 | 2,005 | 2,742
Prior periods | 12,244 | 16,846 | 41,532 | 53,136
Total paid | 13,484 | 18,560 | 43,537 | 55,878
Change in claims incurred in excess of retention limits | (231) | 899 | 508 | 873
Workers' compensation claims liabilities, Ending balance | 177,802 | 227,343 | 177,802 | 227,343
Incurred but not reported (IBNR) | $ 82,076 | $ 117,587 | $ 82,076 | $ 117,587
Ratio of IBNR to workers' compensation claims liabilities | 46.00% | 52.00% | 46.00% | 52.00%

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