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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, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Derivative instruments, gain (loss) recognized in income, net, Total | $ (31,689) | $ (36,101) | $ 114,484 | $ (286,918)
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 | 36,952 | 7,416 | 44,746 | 13,579
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 | (65,083) | (15,685) | (51,858) | (117,511)
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 | (63,044) | (15,638) | (48,839) | (112,995)
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 | (2,039) | (47) | (3,019) | (4,516)
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 | (3,558) | (27,832) | 121,596 | (182,986)
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 | (15,793) | (44,846) | 68,044 | (204,411)
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 | $ 12,235 | $ 17,014 | $ 53,552 | $ 21,425

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