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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, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Workers Compensation Reserve [Abstract] |  |  |  |
Workers' compensation claims liabilities, Beginning balance | $ 336,504 | $ 430,736 | $ 438,986 | $ 413,397
Add: claims expense accrual |  |  |  |
Current period | 35,138 | 37,404 | 106,359 | 118,934
Prior periods | (2,977) | (5,593) | (5,163) | (10,245)
Total expense accrual | 32,161 | 31,811 | 101,196 | 108,689
Less: claim payments related to |  |  |  |
Current period | 7,046 | 8,609 | 13,123 | 14,213
Prior periods | 15,640 | 23,815 | 181,170 | 77,619
Total paid | 22,686 | 32,424 | 194,293 | 91,832
Change in claims incurred in excess of retention limits | 1,369 | (77) | 1,459 | (208)
Workers' compensation claims liabilities, Ending balance | 347,348 | 430,046 | 347,348 | 430,046
Incurred but not reported (IBNR) | $ 203,595 | $ 274,344 | $ 203,595 | $ 274,344
Ratio of IBNR to workers' compensation claims liabilities | 59.00% | 64.00% | 59.00% | 64.00%

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