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Derivative Instruments - Summary of Gross Fair Values of Individual Derivative Instruments (Detail) - Successor [Member] - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014 | Apr. 30, 2013
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Derivatives, Fair Value [Line Items] |  |  |
Gross Amounts of Recognized Assets, Derivative Assets | $ 137,124 | $ 163,683 |
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 405,487 | 461,610 |
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 52,129 | 54,666 |
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 52,129 | 54,666 |
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets | 84,995 | 109,017 | $ 121,643
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 353,358 | 406,944 | $ 621,645
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 | 176,386 | 170,135 |
Net Amount, Derivative Assets | 84,995 | 109,017 |
Net Amount, Derivative Liabilities | 176,972 | 236,809 |
Variable Interest Entities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Gross Amounts of Recognized Assets, Derivative Assets | 36,862 |  |
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 1,965,265 | 2,200,163 |
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 36,862 | 0 |
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 36,862 | 0 |
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets | 0 |  |
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 1,928,403 | 2,200,163 |
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Assets | 0 |  |
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities | 0 | 0 |
Net Amount, Derivative Assets | 0 |  |
Net Amount, Derivative Liabilities | 1,928,403 | 2,200,163 |
Interest Rate Swaps [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Gross Amounts of Recognized Assets, Derivative Assets | 137,015 | 161,640 |
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 370,944 | 385,546 |
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 52,129 | 54,666 |
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 52,129 | 54,666 |
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets | 84,886 | 106,974 |
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 318,815 | 330,880 |
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities | 176,386 | 169,573 |
Net Amount, Derivative Assets | 84,886 | 106,974 |
Net Amount, Derivative Liabilities | 142,429 | 161,307 |
Interest Rate Swaps [Member] | Variable Interest Entities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 1,965,265 | 2,133,268 |
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 1,965,265 | 2,133,268 |
Net Amount, Derivative Liabilities | 1,965,265 | 2,133,268 |
Futures Contracts [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Gross Amounts of Recognized Assets, Derivative Assets | 109 |  |
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 0 | 562 |
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 | 109 |  |
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 0 | 562 |
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities | 0 | 562 |
Net Amount, Derivative Assets | 109 |  |
Net Amount, Derivative Liabilities | 0 | 0 |
Credit Derivatives [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Gross Amounts of Recognized Assets, Derivative Assets | 0 | 2,043 |
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 34,543 | 75,502 |
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 | 0 | 2,043 |
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 34,543 | 75,502 |
Net Amount, Derivative Assets | 0 | 2,043 |
Net Amount, Derivative Liabilities | 34,543 | 75,502 |
Currency Swaps [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets | 0 |  |
Currency Swaps [Member] | Variable Interest Entities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Gross Amounts of Recognized Assets, Derivative Assets | 36,862 |  |
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 0 | 66,895 |
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 36,862 |  |
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 36,862 |  |
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | (36,862) | 66,895 |
Net Amount, Derivative Assets | 0 |  |
Net Amount, Derivative Liabilities | $ (36,862) | $ 66,895 |

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