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Workers' Compensation Claims - Additional Information (Detail) (USD $) | 12 Months Ended |  |  |  |
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Dec. 31, 2013 | Jun. 01, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Estimated future liability for unsettled workers' compensation | $ 112,444,000 |  | $ 70,564,000 | $ 51,193,000 | $ 39,302,000
Receivable from insurer for insured claims liability | 768,000 |  | 757,000 |  |
Long-term workers' compensation claims liabilities | 331,000 |  |  |  |
Aggregate undiscounted payout amount | 440,000 |  |  |  |
Specified investment balances or other financial instruments | 72,900,000 |  | 26,100,000 |  |
Surety bonds and standby letters of credit | 70,800,000 |  |  |  |
Annual fee paid |  |  |  | 292,000 |
Increasing Company's surety deposit requirement |  | 63,900,000 |  |  |
Letter of credit |  | 12,800,000 |  |  |
Certificates of deposit posted as collateral | 12,789,000 |  | 0 |  |
Minimum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Discount rates applied to discounted liabilities | 4.25% |  |  |  |
Pay-out periods to the beneficiaries | 7 years |  |  |  |
Maximum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Discount rates applied to discounted liabilities | 9.00% |  |  |  |
Pay-out periods to the beneficiaries | 32 years |  |  |  |
ACE [Member] | Minimum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Excess workers' compensation insurance coverage with Chartis | 5,000,000 |  |  |  |
ACE [Member] | Maximum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Excess workers' compensation insurance coverage with Chartis | 15,000,000 |  |  |  |
ACE [Member] | Self-Insured States [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Excess workers' compensation insurance retention | 5,000,000 |  |  |  |
ACE [Member] | Colorado [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Excess workers' compensation insurance retention | 2,000,000 |  |  |  |
Excess workers compensation insurance coverage with Chartis maximum limit | Statutory limits |  |  |  |
ACE [Member] | Colorado [Member] | Minimum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Excess workers' compensation insurance coverage with Chartis | 2,000,000 |  |  |  |
ACE [Member] | Maryland [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Excess workers' compensation insurance retention | 1,000,000 |  |  |  |
ACE [Member] | Maryland [Member] | Minimum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Excess workers' compensation insurance coverage with Chartis | 1,000,000 |  |  |  |
ACE [Member] | Maryland [Member] | Maximum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Excess workers' compensation insurance coverage with Chartis | 25,000,000 |  |  |  |
Wells Fargo [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Certificates of deposit posted as collateral |  | $ 12,800,000 |  |  |

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- Definition A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 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 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Percent discount applied to worker's compensation reserve liability to reduce the reserve to present value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph b -Article 7 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 210.7-03.13(b)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6482852&loc=d3e14931-158439 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14754-158437 + Details
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