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Derivative Instruments - Summary of Gross Fair Values of Individual Derivative Instruments (Detail) - USD ($) $ in Thousands | Jun. 30, 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 | $ 72,376 | $ 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 | 88,245 | 76,699
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 86,427 |
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities |  | 70,505
Net Amount, Derivative Assets | 72,376 | 59,468
Derivative Asset, Fair Value, Gross Asset | 72,615 | 59,768
Derivative Asset, Fair Value, Amount Offset Against Collateral | 239 | 300
Derivative liabilities | 88,484 | 76,999
Derivative Liability, Fair Value, Amount Offset Against Collateral | 239 | 300
Derivative Liabilities Net Amount | 1,818 | 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 | 62,941 | 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 | 1,818,273 | 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 | 62,941 | 66,302
Derivative Asset, Fair Value, Gross Asset | 62,941 | 66,302
Derivative Asset, Fair Value, Amount Offset Against Collateral | 0 | 0
Derivative liabilities | 1,818,273 | 1,712,062
Derivative Liability, Fair Value, Amount Offset Against Collateral | 0 | 0
Derivative Liabilities Net Amount | 1,818,273 | 1,712,062
Interest Rate Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets | 72,156 | 59,468
Derivative Asset, Fair Value, Amount Not Offset Against Collateral |  | 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 87,384 | 71,861
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 86,427 | 67,126
Net Amount, Derivative Assets | 72,156 | 59,468
Derivative Asset, Fair Value, Gross Asset | 72,395 | 59,768
Derivative Asset, Fair Value, Amount Offset Against Collateral | 239 | 300
Derivative liabilities | 87,623 | 72,161
Derivative Liability, Fair Value, Amount Offset Against Collateral | 239 | 300
Derivative Liabilities Net Amount | 957 | 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 | 1,818,273 | 1,712,062
Derivative liabilities | 1,818,273 | 1,712,062
Derivative Liabilities Net Amount | 1,818,273 | 1,712,062
Future [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets | 220 |
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 | 220 |
Derivative Asset, Fair Value, Gross Asset | 220 |
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 | 861 | 1,459
Derivative liabilities | 861 | 1,459
Derivative Liability, Fair Value, Amount Offset Against Collateral | 0 | 0
Derivative Liabilities Net Amount | 861 | 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 | 62,941 | 66,302
Derivative Asset, Fair Value, Amount Not Offset Against Collateral |  | 0
Net Amount, Derivative Assets | 62,941 | 66,302
Derivative Asset, Fair Value, Gross Asset | 62,941 | $ 66,302
Derivative Asset, Fair Value, Amount Offset Against Collateral | $ 0 |

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