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Commitments and Contingencies - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended
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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 |  |  |

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- Details
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