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Stock-Based Compensation - Summary of Non-Vested Options for Liability-Classified Stock Options and Stock Appreciation Rights (Detail) (Stock Option and Stock Appreciation Rights [Member], USD $)
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12 Months Ended | |
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Dec. 31, 2013
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Dec. 31, 2012
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Stock Option and Stock Appreciation Rights [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Non-Vested Shares, beginning balance | 2,640 | 42,160 |
| Vested, Shares | (2,640) | (10,120) |
| Forfeited/Expired, Shares | (29,400) | |
| Non-Vested Shares, ending balance | 2,640 | |
| Fair Value of Shares Vested | $ (20,038) | $ (23,962) |