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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
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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 |

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