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Derivative Instruments - Summary of Gross Fair Values of Individual Derivative Instruments (Detail) - Successor [Member] - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Derivatives, Fair Value [Line Items] |  |
Gross Amounts of Recognized Assets, Derivative Assets | $ 56,671 | $ 73,826
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 67,809 | 83,409
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 161 | 627
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 161 | 627
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets | 56,510 | 73,199
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 67,648 | 82,782
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Assets | 0 | 0
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities | 65,563 | 81,260
Net Amount, Derivative Assets | 56,510 | 73,199
Net Amount, Derivative Liabilities | 2,085 | 1,522
Variable Interest Entity [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Amounts of Recognized Assets, Derivative Assets | 60,403 | 54,877
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 1,992,227 | 2,205,264
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 0 | 0
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 0 | 0
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets | 60,403 | 54,877
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 1,992,227 | 2,205,264
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Assets | 0 | 0
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities | 0 | 0
Net Amount, Derivative Assets | 60,403 | 54,877
Net Amount, Derivative Liabilities | 1,992,227 | 2,205,264
Interest Rate Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Amounts of Recognized Assets, Derivative Assets | 56,147 | 73,826
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 66,483 | 81,495
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 161 | 627
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 161 | 627
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets | 55,986 | 73,199
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 66,322 | 80,868
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities | 65,563 | 79,912
Net Amount, Derivative Assets | 55,986 | 73,199
Net Amount, Derivative Liabilities | 759 | 956
Interest Rate Swap [Member] | Variable Interest Entity [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 1,992,227 | 2,205,264
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 1,992,227 | 2,205,264
Net Amount, Derivative Liabilities | 1,992,227 | 2,205,264
Futures Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Amounts of Recognized Assets, Derivative Assets | 524 |
Gross Amounts of Recognized Liabilities, Derivative Liabilities |  | 1,348
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 0 | 0
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 0 | 0
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets | 524 |
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities |  | 1,348
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities |  | 1,348
Net Amount, Derivative Assets | 524 |
Net Amount, Derivative Liabilities |  | 0
Credit Derivatives [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 1,326 | 566
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 0 | 0
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 0 | 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 1,326 | 566
Net Amount, Derivative Liabilities | 1,326 | 566
Currency Swaps [Member] | Variable Interest Entity [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Amounts of Recognized Assets, Derivative Assets | 60,403 | 54,877
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 0 |
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 0 |
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets | 60,403 | 54,877
Net Amount, Derivative Assets | $ 60,403 | $ 54,877

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