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Workers' Compensation Claims - Summarizes Aggregate Workers' Compensation Reserve Activity (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Workers Compensation Reserve [Abstract] |  |  |  |
Workers' compensation claims liabilities, Beginning balance | $ 445,310 | $ 422,872 | $ 438,986 | $ 413,397
Add: claims expense accrual |  |  |  |
Current period | 32,729 | 41,145 | 71,221 | 81,530
Prior periods | (1,373) | (2,952) | (2,186) | (4,652)
Total expense accrual | 31,356 | 38,193 | 69,035 | 76,878
Less: claim payments related to |  |  |  |
Current period | 4,527 | 4,145 | 6,077 | 5,604
Prior periods | 135,853 | 26,088 | 165,530 | 53,804
Total paid | 140,380 | 30,233 | 171,607 | 59,408
Change in claims incurred in excess of retention limits | 218 | (96) | 90 | (131)
Workers' compensation claims liabilities, Ending balance | 336,504 | 430,736 | 336,504 | 430,736
Incurred but not reported (IBNR) | $ 206,521 | $ 273,114 | $ 206,521 | $ 273,114
Ratio of IBNR to workers' compensation claims liabilities | 61.00% | 63.00% | 61.00% | 63.00%

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