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Workers' Compensation Claims - Summarizes Aggregate Workers' Compensation Reserve Activity (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Workers Compensation Reserve [Abstract] |  |  |
Workers' compensation claims liabilities, Beginning balance | $ 70,564 | $ 51,193 | $ 39,302
Claims expense accrual: |  |  |
Current year | 63,822 | 38,386 | 26,161
Prior years | 23,445 | 12,344 | 9,978
Total expense accrual | 87,267 | 50,730 | 36,139
Claims payments related to: |  |  |
Current year | 10,586 | 6,746 | 5,565
Prior years | 34,801 | 24,613 | 18,683
Total paid | 45,387 | 31,359 | 24,248
Workers' compensation claims liabilities, Ending balance | 112,444 | 70,564 | 51,193
Incurred but not reported (IBNR) | $ 69,611 | $ 47,992 | $ 37,335

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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 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph a -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph 5 -Article 9 + Details
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