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Debt - Summary of Debt (Parenthetical) (Detail) (USD $)
6 Months Ended 3 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Mar. 31, 2013
Debenture [Member]
Debt Instrument [Line Items]      
Total debt $ 101,805,000   $ 6,000,000
SBIC debenture interest rate     2.351%
Annual fees     0.515%
Debenture maturity period     10 years
Proceeds on revolving credit facility 27,200,000 20,600,000  
Repayments on revolving credit facility $ 27,100,000 $ 17,400,000