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Fair Value Measurements - Level of Fair Value (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Assets:    
Non-Agency RMBS, at fair value $ 2,593,422 $ 2,851,316
Agency MBS, at fair value 6,989,329 4,364,828
Loans held for investment, at fair value 13,246,521 13,678,263
Net Amounts Offset in the Consolidated Statements of Financial Position 129,341 48,914
Liabilities:    
Securitized debt at fair value, collateralized by loans held for investment 9,340,368 9,388,657
Derivatives, at fair value 0 320
Fair Value, Measurements, Recurring    
Assets:    
Non-Agency RMBS, at fair value 2,593,422 2,851,316
Agency MBS, at fair value 6,989,329 4,364,828
Loans held for investment, at fair value 13,246,521 13,678,263
Counterparty and Cash Collateral, netting (42,140) (1,617)
Net Amounts Offset in the Consolidated Statements of Financial Position 129,341 48,914
Liabilities:    
Securitized debt at fair value, collateralized by loans held for investment 9,340,368 9,388,657
Counterparty and Cash Collateral, netting (16,730) (1,617)
Derivatives, at fair value 0 320
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 2,949 3,553
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 6,989,329 4,364,828
Loans held for investment, at fair value 0 0
Derivatives 168,532 46,978
Liabilities:    
Securitized debt at fair value, collateralized by loans held for investment 0 0
Derivatives 16,730 1,937
Fair Value, Measurements, Recurring | Level 3    
Assets:    
Non-Agency RMBS, at fair value 2,593,422 2,851,316
Agency MBS, at fair value 0 0
Loans held for investment, at fair value 13,246,521 13,678,263
Derivatives 0 0
Liabilities:    
Securitized debt at fair value, collateralized by loans held for investment 9,340,368 9,388,657
Derivatives $ 0 $ 0