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Derivative Instruments - Fair value of Derivative Instruments (Detail)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
item
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Derivative [Line Items]      
Fair value of derivative assets $ 3,094   $ 5,833
Fair value of derivative liabilities 102,802   52,197
AOCI relating to interest rate swaps 6,800    
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months (3,000)    
Loss on interest rate swaps, net 99,609 $ 33,718  
Interest rate swaps      
Derivative [Line Items]      
Fair value of derivative assets     5,302
Fair value of derivative liabilities $ 102,802   52,197
Interest rate swap agreements      
Derivative [Line Items]      
Derivative contract, weighted average maturity (in months) 55 months    
Number of matured or terminated interest rate swap agreements | item 26    
Notional amount of swap agreements matured or terminated during period $ 1,225,000    
TBA Agency MBS      
Derivative [Line Items]      
Fair value of derivative assets $ 3,094   $ 531
Minimum | Interest rate swap agreements      
Derivative [Line Items]      
Fixed interest rate 1.411%    
Minimum | TBA Agency MBS      
Derivative [Line Items]      
Fixed interest rate 3.00%    
Maximum | Interest rate swap agreements      
Derivative [Line Items]      
Fixed interest rate 3.2205%    
Maximum | TBA Agency MBS      
Derivative [Line Items]      
Fixed interest rate 4.00%