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Pension Plan - Schedule of Fair Values of Plan Assets and Fair Value Measurements (Detail) (USD $)
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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|---|---|---|---|
| Defined Benefit Plan Disclosure [Line Items] | |||
| Alternative Investments | $ 9,259,932 | $ 8,509,771 | $ 7,723,072 |
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Quoted Prices in Active Markets (Level 1 Inputs) [Member]
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| Defined Benefit Plan Disclosure [Line Items] | |||
| Alternative Investments | 9,259,932 | 8,509,771 | |
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Cash and Cash Equivalents [Member] | Quoted Prices in Active Markets (Level 1 Inputs) [Member]
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| Defined Benefit Plan Disclosure [Line Items] | |||
| Alternative Investments | 263,452 | 369,174 | |
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Equity Securities [Member] | Quoted Prices in Active Markets (Level 1 Inputs) [Member]
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| Defined Benefit Plan Disclosure [Line Items] | |||
| Alternative Investments | 6,134,969 | 5,305,492 | |
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Fixed Income Securities [Member] | Quoted Prices in Active Markets (Level 1 Inputs) [Member]
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| Defined Benefit Plan Disclosure [Line Items] | |||
| Alternative Investments | 2,730,912 | 2,835,105 | |
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Alternative Investments [Member] | Quoted Prices in Active Markets (Level 1 Inputs) [Member]
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| Defined Benefit Plan Disclosure [Line Items] | |||
| Alternative Investments | $ 130,599 |