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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, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Workers Compensation Reserve [Abstract] |  |  |  |
Workers' compensation claims liabilities, Beginning balance | $ 265,142 | $ 231,723 | $ 255,675 | $ 225,279
Add: claims expense accrual: |  |  |  |
Current period | 34,627 | 30,748 | 65,781 | 58,530
Prior periods | (1,396) | (4,234) | (548) | (7,131)
Total expense accrual | 33,231 | 26,514 | 65,233 | 51,399
Less: claim payments related to: |  |  |  |
Current period | 3,698 | 3,512 | 4,969 | 4,410
Prior periods | 17,625 | 15,481 | 38,889 | 33,024
Total paid | 21,323 | 18,993 | 43,858 | 37,434
Workers' compensation claims liabilities, Ending balance | 277,050 | 239,244 | 277,050 | 239,244
Incurred but not reported (IBNR) | $ 140,115 | $ 118,959 | $ 140,115 | $ 118,959

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- Definition Carrying value as of the balance sheet date of obligations and payables pertaining to claims incurred of a workers compensation nature. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(20)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(24)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(15)(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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