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Derivative Instruments - Summary of Gross Fair Values of Individual Derivative Instruments (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Derivatives, Fair Value [Line Items]    
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets $ 76,400 $ 59,468
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 0 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities 86,534 76,699
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 73,510  
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities   70,505
Net Amount, Derivative Assets 76,400 59,468
Derivative Asset, Fair Value, Gross Asset 76,789 59,768
Derivative Asset, Fair Value, Amount Offset Against Collateral 389 300
Derivative liabilities 86,923 76,999
Derivative Liability, Fair Value, Amount Offset Against Collateral 389 300
Derivative Liabilities Net Amount 13,024 6,194
Variable Interest Entity, Primary Beneficiary [Member]    
Derivatives, Fair Value [Line Items]    
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets 59,228 66,302
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 0 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities 1,781,903 1,712,062
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 0  
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities   0
Net Amount, Derivative Assets 59,228 66,302
Derivative Asset, Fair Value, Gross Asset 59,228 66,302
Derivative Asset, Fair Value, Amount Offset Against Collateral 0 0
Derivative liabilities 1,781,903 1,712,062
Derivative Liability, Fair Value, Amount Offset Against Collateral 0 0
Derivative Liabilities Net Amount 1,781,903 1,712,062
Interest Rate Swap [Member]    
Derivatives, Fair Value [Line Items]    
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets 73,218 59,468
Derivative Asset, Fair Value, Amount Not Offset Against Collateral   0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities 85,457 71,861
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 73,510 67,126
Net Amount, Derivative Assets 73,218 59,468
Derivative Asset, Fair Value, Gross Asset 73,607 59,768
Derivative Asset, Fair Value, Amount Offset Against Collateral 389 300
Derivative liabilities 85,846 72,161
Derivative Liability, Fair Value, Amount Offset Against Collateral 389 300
Derivative Liabilities Net Amount 11,947 4,735
Interest Rate Swap [Member] | Variable Interest Entity, Primary Beneficiary [Member]    
Derivatives, Fair Value [Line Items]    
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities 1,781,903 1,712,062
Derivative liabilities 1,781,903 1,712,062
Derivative Liabilities Net Amount 1,781,903 1,712,062
Future [Member]    
Derivatives, Fair Value [Line Items]    
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets 3,182  
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities   3,379
Derivative Liability, Fair Value, Amount Not Offset Against Collateral   3,379
Net Amount, Derivative Assets 3,182  
Derivative Asset, Fair Value, Gross Asset 3,182  
Derivative Asset, Fair Value, Amount Offset Against Collateral 0  
Derivative liabilities   3,379
Derivative Liability, Fair Value, Amount Offset Against Collateral   0
Derivative Liabilities Net Amount   0
Other Credit Derivatives [Member]    
Derivatives, Fair Value [Line Items]    
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities 1,077 1,459
Derivative liabilities 1,077 1,459
Derivative Liability, Fair Value, Amount Offset Against Collateral 0 0
Derivative Liabilities Net Amount 1,077 1,459
Currency Swaps [Member] | Variable Interest Entity, Primary Beneficiary [Member]    
Derivatives, Fair Value [Line Items]    
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets 59,228 66,302
Derivative Asset, Fair Value, Amount Not Offset Against Collateral   0
Net Amount, Derivative Assets 59,228 66,302
Derivative Asset, Fair Value, Gross Asset 59,228 $ 66,302
Derivative Asset, Fair Value, Amount Offset Against Collateral $ 0