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Derivative Instruments - Summary of Gross Fair Values of Individual Derivative Instruments (Detail) - Successor [Member] - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
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Derivatives, Fair Value [Line Items] |  |
Gross Amounts of Recognized Assets, Derivative Assets | $ 79,778 | $ 139,581
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 92,280 | 381,125
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 731 | 61,839
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 731 | 61,839
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets | 79,047 | 77,742
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 91,549 | 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 | 81,129 | 156,925
Net Amount, Derivative Assets | 79,047 | 77,742
Net Amount, Derivative Liabilities | 10,420 | 162,361
Variable Interest Entities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Amounts of Recognized Assets, Derivative Assets | 65,507 | 80,407
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 2,064,071 | 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 | 65,507 | 80,407
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 2,064,071 | 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 | 65,507 | 80,407
Net Amount, Derivative Liabilities | 2,064,071 | 2,078,601
Interest Rate Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Amounts of Recognized Assets, Derivative Assets | 76,667 | 139,045
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 83,274 | 365,776
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 731 | 61,839
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 731 | 61,839
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets | 75,936 | 77,206
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 82,543 | 303,937
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities | 81,129 | 156,925
Net Amount, Derivative Assets | 75,936 | 77,206
Net Amount, Derivative Liabilities | 1,414 | 147,012
Interest Rate Swap [Member] | Variable Interest Entities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 2,064,071 | 2,078,601
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 2,064,071 | 2,078,601
Net Amount, Derivative Liabilities | 2,064,071 | 2,078,601
Futures Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Amounts of Recognized Assets, Derivative Assets | 3,111 | 536
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 0 |
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 | 3,111 | 536
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 0 |
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities | 0 |
Net Amount, Derivative Assets | 3,111 | 536
Net Amount, Derivative Liabilities | 0 |
Credit Derivatives [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 9,006 | 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 | 9,006 | 15,349
Net Amount, Derivative Liabilities | 9,006 | 15,349
Currency Swaps [Member] | Variable Interest Entities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Amounts of Recognized Assets, Derivative Assets | 65,507 | 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 | 65,507 | 80,407
Net Amount, Derivative Assets | $ 65,507 | $ 80,407

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