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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Workers Compensation Reserve [Abstract] |  |  |  |
Workers' compensation claims liabilities, Beginning balance | $ 422,872 | $ 378,874 | $ 413,397 | $ 363,517
Add: claims expense accrual |  |  |  |
Current period | 41,145 | 39,967 | 81,530 | 79,019
Prior periods | (2,952) |  | (4,652) | (6)
Total expense accrual | 38,193 | 39,967 | 76,878 | 79,013
Less: claim payments related to |  |  |  |
Current period | 4,145 | 5,148 | 5,604 | 6,281
Prior periods | 26,088 | 22,856 | 53,804 | 45,391
Total paid | 30,233 | 28,004 | 59,408 | 51,672
Add: Change in claims incurred in excess of retention limits | (96) | (23) | (131) | (44)
Workers' compensation claims liabilities, Ending balance | 430,736 | 390,814 | 430,736 | 390,814
Incurred but not reported (IBNR) | $ 273,114 | $ 231,702 | $ 273,114 | $ 231,702
Ratio of IBNR to workers' compensation claims liabilities | 63.00% | 59.00% | 63.00% | 59.00%

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