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Fair Value Measurements - Level of Fair Value (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Assets:    
Non-Agency RMBS, at fair value $ 2,614,408 $ 2,486,130
Agency RMBS, at fair value 6,490,293 9,240,057
Agency CMBS, at fair value 2,850,717 2,948,893
Loans held for investment, at fair value 14,292,815 12,572,581
Derivatives, at fair value, net 3,611 37,468
Liabilities:    
Securitized debt at fair value, collateralized by loans held for investment 8,179,608 8,455,376
Net Amounts Offset in the Consolidated Statements of Financial Position 0 0
Fair Value, Measurements, Recurring    
Assets:    
Non-Agency RMBS, at fair value 2,614,408 2,486,130
Agency RMBS, at fair value 6,490,293 9,240,057
Agency CMBS, at fair value 2,850,717  
Loans held for investment, at fair value 14,292,815 12,572,581
Counterparty and Cash Collateral, netting (1,092) (51,653)
Derivatives, at fair value, net 3,611 37,468
Liabilities:    
Securitized debt at fair value, collateralized by loans held for investment 8,179,608 8,455,376
Counterparty and Cash Collateral, netting (205,703) (183,165)
Net Amounts Offset in the Consolidated Statements of Financial Position 0 0
Fair Value, Measurements, Recurring | Level 1    
Assets:    
Non-Agency RMBS, at fair value 0 0
Agency RMBS, at fair value 0 0
Agency CMBS, at fair value 0 0
Loans held for investment, at fair value 0 0
Derivatives 3,611 0
Liabilities:    
Securitized debt at fair value, collateralized by loans held for investment 0 0
Derivatives 0 13,375
Fair Value, Measurements, Recurring | Level 2    
Assets:    
Non-Agency RMBS, at fair value 0 0
Agency RMBS, at fair value 6,490,293 9,240,057
Agency CMBS, at fair value 2,850,717 2,948,893
Loans held for investment, at fair value 0 0
Derivatives 1,092 89,121
Liabilities:    
Securitized debt at fair value, collateralized by loans held for investment 0 0
Derivatives 205,703 169,790
Fair Value, Measurements, Recurring | Level 3    
Assets:    
Non-Agency RMBS, at fair value 2,614,408 2,486,130
Agency RMBS, at fair value 0 0
Agency CMBS, at fair value 0 0
Loans held for investment, at fair value 14,292,815 12,572,581
Derivatives 0 0
Liabilities:    
Securitized debt at fair value, collateralized by loans held for investment 8,179,608 8,455,376
Derivatives $ 0 $ 0