Securitized Debt Obligations, Net - Schedule of Information on Securitized Debt Obligations (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($) Loans
Debt Instrument [Line Items]
Count | Loans	1
Principal Balance	$ 474,620
Book Value	$ 474,123
Term	2033-06
Loans [Member]
Debt Instrument [Line Items]
Count | Loans	1
Principal Balance	$ 642,806
Book Value	$ 639,280
Term	2023-06
LIBOR [Member]
Debt Instrument [Line Items]
Yield/Cost	1.95%
LIBOR [Member] | Loans [Member]
Debt Instrument [Line Items]
Yield/Cost	3.60%