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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, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Workers Compensation Reserve [Abstract] |  |  |  |
Workers’ compensation claims liabilities, Beginning balance | $ 326,233 | $ 265,142 | $ 312,537 | $ 255,675
Add: claims expense accrual |  |  |  |
Current period | 37,878 | 34,627 | 73,153 | 65,781
Prior periods | 2,350 | (1,396) | 5,264 | (548)
Total expense accrual | 40,228 | 33,231 | 78,417 | 65,233
Less: claim payments related to |  |  |  |
Current period | 4,148 | 3,698 | 5,280 | 4,969
Prior periods | 25,998 | 17,625 | 49,462 | 38,889
Total paid | 30,146 | 21,323 | 54,742 | 43,858
Add: Change in claims incurred in excess of retention limits | (6,236) |  | (6,133) |
Workers’ compensation claims liabilities, Ending balance | 330,079 | 277,050 | 330,079 | 277,050
Incurred but not reported (IBNR) | $ 167,693 | $ 140,115 | $ 167,693 | $ 140,115

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