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Commitments and Contingencies - Additional Information (Detail) $ in Thousands | May 06, 2016 lawsuit | Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) | Aug. 31, 2016 lawsuit
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Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of class action lawsuits | lawsuit |  |  |  | 2
Number of consolidated lawsuits | lawsuit | 3 |  |  |
Unfunded loan commitments |  | $ 119,813 | $ 170,365 |
Commercial Mortgage Loans [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Unfunded loan commitments |  | 119,813 |  |
Subordinate Mortgage Loans [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Unfunded loan commitments |  | $ 119,813 |  |

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