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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Workers Compensation Reserve [Abstract] |  |  |  |
Workers' compensation claims liabilities, Beginning balance | $ 430,736 | $ 390,814 | $ 413,397 | $ 363,517
Add: claims expense accrual |  |  |  |
Current period | 37,404 | 37,784 | 118,934 | 116,803
Prior periods | (5,593) | (2,327) | (10,245) | (2,333)
Total expense accrual | 31,811 | 35,457 | 108,689 | 114,470
Less: claim payments related to |  |  |  |
Current period | 8,609 | 7,502 | 14,213 | 13,783
Prior periods | 23,815 | 19,905 | 77,619 | 65,296
Total paid | 32,424 | 27,407 | 91,832 | 79,079
Change in claims incurred in excess of retention limits | (77) | (26) | (208) | (70)
Workers' compensation claims liabilities, Ending balance | 430,046 | 398,838 | 430,046 | 398,838
Incurred but not reported (IBNR) | $ 274,344 | $ 246,174 | $ 274,344 | $ 246,174
Ratio of IBNR to workers' compensation claims liabilities | 64.00% | 62.00% | 64.00% | 62.00%

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