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Commitments and Contingencies - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2011
Dec. 31, 2012
Jun. 30, 2011
Contingencies [Member]
Dec. 31, 2012
Company [Member]
Dec. 31, 2012
Underwriters [Member]
Contingencies And Commitments [Line Items]          
Unfunded loan commitments   $ 34,650,000      
Underwriting fee to be paid to the underwriters       10,000,000  
Actual percentage of gross proceeds paid to underwriters   1.00%   5.00% 4.00%
Actual amount paid to the underwriters as underwriting fee   8,000,000      
Amount of underwriting fee deferred 10,000,000   10,000,000   2,000,000
Payment to Managers   8,000,000      
Payment to underwriters   $ 2,000,000      
Performance Hurdle Rate   8.00%      
Public offering price per share   $ 20      
Number of shares of common stock sold in the IPO   10,500,000