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Derivative Instruments - Summary of Location and Amount of Gains and Losses of Derivative Contracts (Detail) - Successor [Member] - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Derivative instruments, gain (loss) recognized in income, net, Total | $ (188,012) | $ (31,689) | $ (423,421) | $ 114,484
Net Change in Fair Value of Credit Derivatives [Member] | Credit Derivatives [Member] | Financial Guarantee [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Derivative instruments, gain (loss) recognized in income, net, Total | 1,733 | 36,952 | 18,554 | 44,746
Derivative Products [Member] | Financial Services Derivatives Products [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Derivative instruments, gain (loss) recognized in income, net, Total | (14,510) | (65,083) | (134,265) | (51,858)
Derivative Products [Member] | Interest Rate Swaps [Member] | Financial Services Derivatives Products [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Derivative instruments, gain (loss) recognized in income, net, Total | (14,646) | (63,044) | (125,079) | (48,839)
Derivative Products [Member] | Futures Contracts [Member] | Financial Services Derivatives Products [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Derivative instruments, gain (loss) recognized in income, net, Total | 136 | (2,039) | (9,186) | (3,019)
Income Loss On Variable Interest Entities [Member] | Variable Interest Entity [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Derivative instruments, gain (loss) recognized in income, net, Total | (175,235) | (3,558) | (307,710) | 121,596
Income Loss On Variable Interest Entities [Member] | Interest Rate Swaps [Member] | Variable Interest Entity [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Derivative instruments, gain (loss) recognized in income, net, Total | (180,744) | (15,793) | (339,524) | 68,044
Income Loss On Variable Interest Entities [Member] | Currency Swaps [Member] | Variable Interest Entity [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Derivative instruments, gain (loss) recognized in income, net, Total | $ 5,509 | $ 12,235 | $ 31,814 | $ 53,552

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