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Secured Debt Agreements, Net - Schedule of Secured Debt Agreements (Detail) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Debt Instrument [Line Items]      
Secured debt agreements borrowings outstanding $ 517,256,000 $ 679,207,000  
Secured debt agreements borrowings outstanding 6,096,597,000 5,731,626,000  
Deferred financing costs (17,462,000) (15,272,000)  
Net book value of secured debt 6,079,135,000 5,716,354,000  
Credit Facilities [Member]      
Debt Instrument [Line Items]      
Secured debt agreements borrowings outstanding 4,386,645,000 3,572,837,000  
GE Portfolio Acquisition Facility [Member]      
Debt Instrument [Line Items]      
Secured debt agreements borrowings outstanding 1,090,946,000 1,479,582,000  
Asset-Specific Financings [Member]      
Debt Instrument [Line Items]      
Secured debt agreements borrowings outstanding 517,256,000 $ 679,207,000  
Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Secured debt agreements borrowings outstanding $ 101,750,000   $ 0