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Derivative Instruments - Summary of Location and Amount of Gains and Losses of Derivative Contracts (Detail) - USD ($) $ in Thousands | 4 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2014
Successor [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Derivative instruments, gain (loss) recognized in income, net, Total |  | $ 802,462 | $ 270,917 | $ (585,038)
Predecessor [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Derivative instruments, gain (loss) recognized in income, net, Total | $ (297,855) |  |  |
Net Change in Fair Value of Credit Derivatives [Member] | Successor [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 |  | 192,869 | 41,701 | 23,906
Net Change in Fair Value of Credit Derivatives [Member] | Predecessor [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 | (60,384) |  |  |
Derivative Products [Member] | Successor [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 |  | 114,771 | (42,544) | (181,087)
Derivative Products [Member] | Successor [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 |  | 103,846 | (41,177) | (173,615)
Derivative Products [Member] | Successor [Member] | Currency 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 |  |  | 0 | 0
Derivative Products [Member] | Successor [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 |  | 10,925 | (1,367) | (7,472)
Derivative Products [Member] | Predecessor [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 | (33,735) |  |  |
Derivative Products [Member] | Predecessor [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 | (30,602) |  |  |
Derivative Products [Member] | Predecessor [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 | (3,133) |  |  |
Other Income [Member] | Successor [Member] | Call Options on Long-Term Debt [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Derivative instruments, gain (loss) recognized in income, net, Total |  | 0 |  |
Other Income [Member] | Predecessor [Member] | Call Options on Long-Term Debt [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Derivative instruments, gain (loss) recognized in income, net, Total | 0 |  |  |
Income Loss On Variable Interest Entities [Member] | Successor [Member] | Variable Interest Entity [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Derivative instruments, gain (loss) recognized in income, net, Total |  | 494,822 | 271,760 | (427,857)
Income Loss On Variable Interest Entities [Member] | Successor [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 |  | 495,712 | 168,003 | (452,434)
Income Loss On Variable Interest Entities [Member] | Successor [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 |  | $ (890) | $ 103,757 | $ 24,577
Income Loss On Variable Interest Entities [Member] | Predecessor [Member] | Variable Interest Entity [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Derivative instruments, gain (loss) recognized in income, net, Total | (203,736) |  |  |
Income Loss On Variable Interest Entities [Member] | Predecessor [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 | (203,620) |  |  |
Income Loss On Variable Interest Entities [Member] | Predecessor [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 | $ (116) |  |  |

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