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Employee Benefit Plans - Summary of Pension Plan Assets (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | --- | ---
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets | $ 50,384 | $ 44,998 |
Investments in equity securities [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets | 26,545 | 23,373 |
Investments in equity securities [Member] | U.S. Large Cap [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets | 6,947 | 6,297 |
Investments in equity securities [Member] | U.S. Mid Cap [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets | 3,078 | 2,683 |
Investments in equity securities [Member] | U.S. Small Cap [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets | 1,523 | 1,341 |
Investments in equity securities [Member] | International [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets | 10,019 | 8,563 |
Investments in equity securities [Member] | Alternative Strategies [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets | 4,978 | 4,489 |
Debt securities [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets | 19,163 | 17,110 |
Debt securities [Member] | Inflation Protected [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets | 2,507 | 2,237 |
Debt securities [Member] | Fixed Income [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets | 14,109 | 12,617 |
Debt securities [Member] | High Yield [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets | 2,547 | 2,256 |
Other [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets | 4,676 | 4,515 |
Other [Member] | Commodities [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets | 1,918 | 1,789 |
Other [Member] | Real Estate [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets | 2,048 | 1,797 |
Other [Member] | Guaranteed deposit [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets | 710 | 897 |
Other [Member] | Other [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets |  | 32 |
Quoted Prices in Active Markets (Level 1) [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets | 24,974 | 22,053 |
Quoted Prices in Active Markets (Level 1) [Member] | Investments in equity securities [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets | 18,501 | 16,198 |
Quoted Prices in Active Markets (Level 1) [Member] | Investments in equity securities [Member] | U.S. Large Cap [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets | 3,504 | 3,146 |
Quoted Prices in Active Markets (Level 1) [Member] | Investments in equity securities [Member] | U.S. Mid Cap [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets |  |  |
Quoted Prices in Active Markets (Level 1) [Member] | Investments in equity securities [Member] | U.S. Small Cap [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets |  |  |
Quoted Prices in Active Markets (Level 1) [Member] | Investments in equity securities [Member] | International [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets | 10,019 | 8,563 |
Quoted Prices in Active Markets (Level 1) [Member] | Investments in equity securities [Member] | Alternative Strategies [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets | 4,978 | 4,489 |
Quoted Prices in Active Markets (Level 1) [Member] | Debt securities [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets | 2,507 | 2,237 |
Quoted Prices in Active Markets (Level 1) [Member] | Debt securities [Member] | Inflation Protected [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets | 2,507 | 2,237 |
Quoted Prices in Active Markets (Level 1) [Member] | Debt securities [Member] | Fixed Income [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets |  |  |
Quoted Prices in Active Markets (Level 1) [Member] | Debt securities [Member] | High Yield [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets |  |  |
Quoted Prices in Active Markets (Level 1) [Member] | Other [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets | 3,966 | 3,618 |
Quoted Prices in Active Markets (Level 1) [Member] | Other [Member] | Commodities [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets | 1,918 | 1,789 |
Quoted Prices in Active Markets (Level 1) [Member] | Other [Member] | Real Estate [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets | 2,048 | 1,797 |
Quoted Prices in Active Markets (Level 1) [Member] | Other [Member] | Guaranteed deposit [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets |  |  |
Quoted Prices in Active Markets (Level 1) [Member] | Other [Member] | Other [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets |  | 32 |
Significant Other Observable Inputs (Level 2) [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets | 24,700 | 22,048 |
Significant Other Observable Inputs (Level 2) [Member] | Investments in equity securities [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets | 8,044 | 7,175 |
Significant Other Observable Inputs (Level 2) [Member] | Investments in equity securities [Member] | U.S. Large Cap [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets | 3,443 | 3,151 |
Significant Other Observable Inputs (Level 2) [Member] | Investments in equity securities [Member] | U.S. Mid Cap [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets | 3,078 | 2,683 |
Significant Other Observable Inputs (Level 2) [Member] | Investments in equity securities [Member] | U.S. Small Cap [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets | 1,523 | 1,341 |
Significant Other Observable Inputs (Level 2) [Member] | Investments in equity securities [Member] | International [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets |  |  |
Significant Other Observable Inputs (Level 2) [Member] | Investments in equity securities [Member] | Alternative Strategies [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets |  |  |
Significant Other Observable Inputs (Level 2) [Member] | Debt securities [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets | 16,656 | 14,873 |
Significant Other Observable Inputs (Level 2) [Member] | Debt securities [Member] | Inflation Protected [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets |  |  |
Significant Other Observable Inputs (Level 2) [Member] | Debt securities [Member] | Fixed Income [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets | 14,109 | 12,617 |
Significant Other Observable Inputs (Level 2) [Member] | Debt securities [Member] | High Yield [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets | 2,547 | 2,256 |
Significant Other Observable Inputs (Level 2) [Member] | Other [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets |  |  |
Significant Other Observable Inputs (Level 2) [Member] | Other [Member] | Commodities [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets |  |  |
Significant Other Observable Inputs (Level 2) [Member] | Other [Member] | Real Estate [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets |  |  |
Significant Other Observable Inputs (Level 2) [Member] | Other [Member] | Guaranteed deposit [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets |  |  |
Significant Other Observable Inputs (Level 2) [Member] | Other [Member] | Other [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets |  |  |
Significant Unobservable Inputs (Level 3) [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets | 710 | 897 |
Significant Unobservable Inputs (Level 3) [Member] | Investments in equity securities [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets |  |  |
Significant Unobservable Inputs (Level 3) [Member] | Investments in equity securities [Member] | U.S. Large Cap [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets |  |  |
Significant Unobservable Inputs (Level 3) [Member] | Investments in equity securities [Member] | U.S. Mid Cap [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets |  |  |
Significant Unobservable Inputs (Level 3) [Member] | Investments in equity securities [Member] | International [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets |  |  |
Significant Unobservable Inputs (Level 3) [Member] | Investments in equity securities [Member] | Alternative Strategies [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets |  |  |
Significant Unobservable Inputs (Level 3) [Member] | Debt securities [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets |  |  |
Significant Unobservable Inputs (Level 3) [Member] | Debt securities [Member] | Inflation Protected [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets |  |  |
Significant Unobservable Inputs (Level 3) [Member] | Debt securities [Member] | Fixed Income [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets |  |  |
Significant Unobservable Inputs (Level 3) [Member] | Debt securities [Member] | High Yield [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets |  |  |
Significant Unobservable Inputs (Level 3) [Member] | Other [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets | 710 | 897 |
Significant Unobservable Inputs (Level 3) [Member] | Other [Member] | Commodities [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets |  |  |
Significant Unobservable Inputs (Level 3) [Member] | Other [Member] | Real Estate [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets |  |  |
Significant Unobservable Inputs (Level 3) [Member] | Other [Member] | Guaranteed deposit [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets | 710 | 897 |
Significant Unobservable Inputs (Level 3) [Member] | Other [Member] | Other [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total Pension Plan Assets |  |  |

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=6867990&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 49 -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 132R -Paragraph 5 -Subparagraph d(iv)(b)(i) -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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