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Workers' Compensation Claims - Summarizes Aggregate Workers' Compensation Reserve Activity (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Workers Compensation Reserve [Abstract] |  |  |
Workers’ compensation claims liabilities, Beginning balance | $ 312,537 | $ 255,675 | $ 225,278
Add: claims expense accrual |  |  |
Current period | 154,091 | 137,852 | 122,740
Prior periods | 5,159 | (301) | (13,683)
Total expense accrual | 159,250 | 137,551 | 109,057
Less: claim payments related to |  |  |
Current period | 19,537 | 20,180 | 17,517
Prior periods | 82,573 | 69,626 | 61,143
Total paid | 102,110 | 89,806 | 78,660
Add: change in claims incurred in excess of retention limits | (6,160) | 9,117 |
Workers' compensation claims liabilities, Ending balance | 363,517 | 312,537 | 255,675
Incurred but not reported (IBNR) | $ 202,227 | $ 158,169 | $ 127,792
Ratio of IBNR to workers' compensation claims liabilities | 56.00% | 51.00% | 50.00%

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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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