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Benefit Plans - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |
Letters of credit with bank | $ 6,767 |  |
Employees eligibility | Completed one year of service and are at least 21 years of age |  |
Minimum years of service required | 1 year |  |
Minimum years of age required | 21 |  |
Employers contribution and compensation | Match 50% of employees' contributions up to 5% of eligible compensation |  |
Employers contribution as percentage of employees contribution | 50.00% |  |
Employers contribution as percentage of employees compensation | 5.00% |  |
Employees contribution limit | 100.00% |  |
Fully vesting period of contribution | 3 |  |
Minimum age for entitlement to benefit of deferred compensation plan | 30 |  |
Minimum years of experience to attain the benefit of deferred compensation plan | 10 Years |  |
Deferred compensation arrangement with individual employees contribution minimum | 3 |  |
Deferred compensation arrangement with individual employees contribution maximum | 8 |  |
Deferred Profit Sharing [Member] |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |
Employer's contribution | 3,184 | 2,870 | 1,263
Deferred Compensation Plan [Member] |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |
Employer's contribution | $ 1,260 | $ 1,223 | $ 1,164

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- Definition Deferred compensation arrangement with individual employees contribution minimum. + References No definition available. + Details
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- Definition Minimum age for entitlement to benefit of deferred compensation plan. + References No definition available. + Details
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- Definition Minimum years of age required. + References No definition available. + Details
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- Definition Minimum years of service required. + References No definition available. + Details
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- Definition The amount of payment into the fund established for purposes of making future disbursements to the individual in accordance with the terms and understanding of the deferred compensation arrangement. + References No definition available. + Details
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- Details
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- Definition The minimum period that the individual is required to perform services in order to be fully vested under the deferred compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64, 65, A240 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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