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Stock-based Compensation and Employee Benefits - (Summary of Material Vesting Term of Stock Option Granted) (Detail)
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12 Months Ended |
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Dec. 31, 2013
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| Share Based Compensation [Line Items] | |
| Total options granted in 2013 | 177,551 |
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Vesting 1/2 on Each of the Third and Fourth Anniversary of Grant Date [Member]
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| Share Based Compensation [Line Items] | |
| Total options granted in 2013 | 167,750 |
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Vesting 1/2 in August 2014 and 1/2 in August 2015 [Member]
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| Share Based Compensation [Line Items] | |
| Total options granted in 2013 | 4,000 |
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Vesting 1/2 in June 2014 and 1/2 in June 2015 [Member]
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|
| Share Based Compensation [Line Items] | |
| Total options granted in 2013 | 3,000 |
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Vesting 1/2 in September 2016 and 1/2 in September 2017 [Member]
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| Share Based Compensation [Line Items] | |
| Total options granted in 2013 | 2,801 |