Securitized Debt - Callable Debt (Detail) - Securitized Loans $ in Thousands	Sep. 30, 2016 USD ($)
Debt Instrument, Redemption [Line Items]
2016	$ 1,627,066
2017	181,117
2018	1,252,873
2019	0
2020	3,995,109
Total	$ 7,056,165