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Cumulative Preferred Stock of Subsidiary - Additional Information (Detail) (Cumulative Preferred Stock [Member], Small Business Investment Company Subsidiaries [Member], USD $)
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1 Months Ended | 12 Months Ended | ||
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Feb. 28, 2014
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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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Cumulative Preferred Stock [Member] | Small Business Investment Company Subsidiaries [Member]
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| Preferred Stock Of Subsidiary Corporation [Line Items] | ||||
| Shares outstanding | 30,000 | |||
| Par value of shares | $ 100 | |||
| Percentage of outstanding preferred stock | 3.00% | |||
| Cost of redeemable preferred stock | $ 3,000,000 | |||
| Value of redeemed preferred stock | 900,000 | |||
| Dividends | 90,000 | 90,000 | 90,000 | |
| Loss on redemption of preferred stock | $ 2,100,000 | |||