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Stock-Based Compensation - Summary of Market Condition Inducement Grant of Restricted Shares (Detail) (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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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
| Stock based compensation, Shares Outstanding, beginning balance |
7,900 |
9,317 |
| Stock based compensation, Shares, Granted |
|
|
| Stock based compensation, Shares Vested |
|
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| Stock based compensation, Shares, Forfeited/Expired |
2,833 |
1,417 |
| Stock based compensation, Shares Outstanding, ending balance |
5,067 |
7,900 |
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Restricted Shares [Member]
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|
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
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| Stock based compensation, Shares Outstanding, beginning balance |
113,000 |
96,000 |
| Stock based compensation, Shares, Granted |
|
17,000 |
| Stock based compensation, Shares Vested |
(18,500) |
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| Stock based compensation, Shares, Forfeited/Expired |
|
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| Stock based compensation, Shares Outstanding, ending balance |
94,500 |
113,000 |
| Stock based compensation, Weighted Average Fair Value Per Share, beginning balance |
$ 18.40 |
$ 18.47 |
| Stock based compensation, Weighted Average Fair Value Per Share, Granted |
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$ 18.02 |
| Stock based compensation, Weighted Average Fair Value Per Share, Vested |
$ 23.89 |
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| Stock based compensation, Weighted Average Fair Value Per Share, Forfeited/Expired |
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| Stock based compensation, Weighted Average Fair Value Per Share, ending balance |
$ 17.33 |
$ 18.40 |