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Securitized Debt Obligations, Net - Schedule of Information on Securitized Debt Obligations (Parenthetical) (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2017
Loans Managed, Securitized or Asset-backed Financing Arrangement [Abstract]    
Interest expense on securitized debt obligations $ 37,000 $ 37,000