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Derivative Instruments - Fair value of Derivative Instruments (Detail)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
item
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Derivative [Line Items]          
Fair value of derivative assets $ 2,459   $ 2,459   $ 46,207
Fair value of derivative liabilities 71,821   71,821   15,901
AOCI relating to interest rate swaps     8,500    
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months (3,600)   (3,600)    
Unrealized loss (gain) on interest rate swaps, net 28,720 $ (15,910) 120,146 $ (55,160)  
Interest rate swaps          
Derivative [Line Items]          
Fair value of derivative assets 1,842   1,842   40,192
Fair value of derivative liabilities 71,708   71,708   15,901
Interest rate swap agreements          
Derivative [Line Items]          
Fair value of derivative assets 1,800   1,800    
Fair value of derivative liabilities 71,700   $ 71,700    
Derivative contract, weighted average maturity (in months)     47 months    
Notional amount of interest rate swap agreements added during the period $ 275,000        
Number of matured or terminated interest rate swap agreements | item 24        
Notional amount of swap agreements matured or terminated during period $ 1,040,000        
Number of new swap agreements | item 8        
TBA Agency MBS          
Derivative [Line Items]          
Fair value of derivative assets $ 617   $ 617   $ 6,015
Fair value of derivative liabilities $ 113   $ 113    
Minimum | Interest rate swap agreements          
Derivative [Line Items]          
Fixed interest rate 1.287%   1.287%    
Minimum | TBA Agency MBS          
Derivative [Line Items]          
Fixed interest rate 3.00%   3.00%    
Maximum | Interest rate swap agreements          
Derivative [Line Items]          
Fixed interest rate 3.2205%   3.2205%    
Maximum | TBA Agency MBS          
Derivative [Line Items]          
Fixed interest rate 4.00%   4.00%