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Fair Value Measurements - Level of Fair Value (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Assets:    
Non-Agency RMBS, at fair value $ 2,851,316 $ 3,330,063
Agency MBS, at fair value 4,364,828 4,167,754
Loans held for investment, at fair value 13,678,263 8,753,653
Derivatives, at fair value, net 48,914 9,677
Liabilities:    
Securitized debt at fair value, collateralized by loans held for investment (9,388,657) (6,941,097)
Derivative, Total (320) (2,350)
Fair Value, Measurements, Recurring    
Assets:    
Non-Agency RMBS, at fair value 2,851,316 3,330,063
Agency MBS, at fair value 4,364,828 4,167,754
Loans held for investment, at fair value 13,678,263 8,753,653
Counterparty and Cash Collateral, netting (1,617) (14,435)
Derivatives, at fair value, net 48,914 9,677
Liabilities:    
Securitized debt at fair value, collateralized by loans held for investment (9,388,657) (6,941,097)
Counterparty and Cash Collateral, netting 1,617 14,875
Derivative, Total (320) (2,350)
Fair Value, Measurements, Recurring | Level 1    
Assets:    
Non-Agency RMBS, at fair value 0 0
Agency MBS, at fair value 0 0
Loans held for investment, at fair value 0 0
Derivatives 3,553 1,785
Liabilities:    
Securitized debt at fair value, collateralized by loans held for investment 0 0
Derivatives 0 0
Fair Value, Measurements, Recurring | Level 2    
Assets:    
Non-Agency RMBS, at fair value 0 0
Agency MBS, at fair value 4,364,828 4,167,754
Loans held for investment, at fair value 0 0
Derivatives 46,978 22,327
Liabilities:    
Securitized debt at fair value, collateralized by loans held for investment 0 0
Derivatives (1,937) (17,225)
Fair Value, Measurements, Recurring | Level 3    
Assets:    
Non-Agency RMBS, at fair value 2,851,316 3,330,063
Agency MBS, at fair value 0 0
Loans held for investment, at fair value 13,678,263 8,753,653
Derivatives 0 0
Liabilities:    
Securitized debt at fair value, collateralized by loans held for investment (9,388,657) (6,941,097)
Derivatives $ 0 $ 0