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Derivative Instruments - Summary of Gross Fair Values of Individual Derivative Instruments (Detail) - Successor [Member] - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
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Derivatives, Fair Value [Line Items] |  |
Gross Amounts of Recognized Assets, Derivative Assets | $ 77,108 | $ 139,581
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 246,946 | 381,125
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 2,711 | 61,839
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 2,711 | 61,839
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets | 74,397 | 77,742
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 244,235 | 319,286
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 | 81,151 | 156,925
Net Amount, Derivative Assets | 74,397 | 77,742
Net Amount, Derivative Liabilities | 163,084 | 162,361
Variable Interest Entities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Amounts of Recognized Assets, Derivative Assets | 75,459 | 80,407
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 2,064,105 | 2,078,601
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 | 75,459 | 80,407
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 2,064,105 | 2,078,601
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 | 75,459 | 80,407
Net Amount, Derivative Liabilities | 2,064,105 | 2,078,601
Interest Rate Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Amounts of Recognized Assets, Derivative Assets | 77,108 | 139,045
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 232,013 | 365,776
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 2,711 | 61,839
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 2,711 | 61,839
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets | 74,397 | 77,206
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 229,302 | 303,937
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities | 80,714 | 156,925
Net Amount, Derivative Assets | 74,397 | 77,206
Net Amount, Derivative Liabilities | 148,588 | 147,012
Interest Rate Swap [Member] | Variable Interest Entities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 2,064,105 | 2,078,601
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 2,064,105 | 2,078,601
Net Amount, Derivative Liabilities | 2,064,105 | 2,078,601
Futures Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Amounts of Recognized Assets, Derivative Assets |  | 536
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 437 |
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 |  | 536
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 437 |
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities | 437 |
Net Amount, Derivative Assets |  | 536
Net Amount, Derivative Liabilities | 0 |
Credit Derivatives [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 14,496 | 15,349
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 | 14,496 | 15,349
Net Amount, Derivative Liabilities | 14,496 | 15,349
Currency Swaps [Member] | Variable Interest Entities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Amounts of Recognized Assets, Derivative Assets | 75,459 | 80,407
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 | 75,459 | 80,407
Net Amount, Derivative Assets | $ 75,459 | $ 80,407

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