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           Related-Party Transactions - Summary of Management Fees, Incentive Fees and Associated Credits and Administration Fees (Parenthetical) (Detail) (USD $) 
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        3 Months Ended | |
|---|---|---|
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           Mar. 31, 2014 
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           Mar. 31, 2013 
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| Related Party Transactions [Abstract] | ||
| Incentive fee paid to adviser | $ 0 | $ 41,037 | 
| X | ||||||||||
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- Definition 
          Related party transaction incentive fee. No definition available. 
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- Details 
          
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