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Derivative Instruments - Summary of Gross Fair Values of Individual Derivative Instruments (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | $ 59,768 | $ 73,826
Derivative Asset, Fair Value, Amount Offset Against Collateral | 300 | 627
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets | 59,468 | 73,199
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 76,699 | 82,782
Fair value of derivative liabilities | 70,505 |
Net Amount, Derivative Assets | 59,468 | 73,199
Net Amount, Derivative Liabilities | 6,194 | 1,522
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 76,999 | 83,409
Derivative Liability, Fair Value, Amount Offset Against Collateral | 300 | 627
Variable Interest Entity, Primary Beneficiary [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 66,302 | 54,877
Derivative Asset, Fair Value, Amount Offset Against Collateral | 0 | 0
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets | 66,302 | 54,877
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 1,712,062 | 2,205,264
Fair value of derivative liabilities | 0 |
Net Amount, Derivative Assets | 66,302 | 54,877
Net Amount, Derivative Liabilities | 1,712,062 | 2,205,264
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 1,712,062 | 2,205,264
Derivative Liability, Fair Value, Amount Offset Against Collateral | 0 |
Other Credit Derivatives [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 1,459 |
Net Amount, Derivative Liabilities | 1,459 | 566
Derivative Liability, Fair Value, Gross Liability | 1,459 | 566
Derivative Liability, Fair Value, Amount Offset Against Collateral | 0 | 0
Interest Rate Swaps [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 59,768 | 73,826
Derivative Asset, Fair Value, Amount Offset Against Collateral | 300 | 627
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets | 59,468 | 73,199
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 71,861 |
Fair value of derivative liabilities | 67,126 | 79,912
Net Amount, Derivative Assets | 59,468 | 73,199
Net Amount, Derivative Liabilities | 4,735 | 956
Derivative Liability, Fair Value, Gross Liability | 72,161 | 81,495
Derivative Liability, Fair Value, Amount Offset Against Collateral | 300 |
Interest Rate Swaps [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 1,712,062 |
Net Amount, Derivative Liabilities | 1,712,062 | 2,205,264
Derivative Liability, Fair Value, Gross Liability | 1,712,062 | 2,205,264
Future [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 3,379 |
Fair value of derivative liabilities | 3,379 | 1,348
Net Amount, Derivative Liabilities | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 3,379 | 1,348
Derivative Liability, Fair Value, Amount Offset Against Collateral | 0 | 0
Currency Swaps [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 66,302 | 54,877
Derivative Asset, Fair Value, Amount Offset Against Collateral | 0 |
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets | 66,302 | 54,877
Net Amount, Derivative Assets | $ 66,302 | $ 54,877

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