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Derivative Instruments - Summary of Gross Fair Values of Individual Derivative Instruments (Detail) - Successor [Member] - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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Derivatives, Fair Value [Line Items] |  |  |
Gross Amounts of Recognized Assets, Derivative Assets | $ 176,727 | $ 137,124 |
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 487,499 | 405,487 |
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 79,168 | 52,129 |
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 79,168 | 52,129 |
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets | 97,559 | 84,995 |
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 408,331 | 353,358 |
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 | 208,393 | 176,386 |
Net Amount, Derivative Assets | 97,559 | 84,995 |
Net Amount, Derivative Liabilities | 199,938 | 176,972 |
Variable Interest Entities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Gross Amounts of Recognized Assets, Derivative Assets | 48,801 | 36,862 |
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 2,123,608 | 1,965,265 |
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 48,801 | 36,862 |
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 48,801 | 36,862 |
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 | 2,074,807 | 1,928,403 |
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 | 2,074,807 | 1,928,403 |
Interest Rate Swaps [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Gross Amounts of Recognized Assets, Derivative Assets | 176,727 | 137,015 |
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 465,453 | 370,944 |
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 79,168 | 52,129 |
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 79,168 | 52,129 |
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets | 97,559 | 84,886 |
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 386,285 | 318,815 |
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities | 208,393 | 176,386 |
Net Amount, Derivative Assets | 97,559 | 84,886 |
Net Amount, Derivative Liabilities | 177,892 | 142,429 |
Interest Rate Swaps [Member] | Variable Interest Entities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Gross Amounts of Recognized Assets, Derivative Assets | 0 |  |
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 2,123,608 | 1,965,265 |
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 | 0 |  |
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 2,123,608 | 1,965,265 |
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Assets | 0 |  |
Net Amount, Derivative Assets | 0 |  |
Net Amount, Derivative Liabilities | 2,123,608 | 1,965,265 |
Futures Contracts [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Gross Amounts of Recognized Assets, Derivative Assets |  |  | $ 109
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 117 | 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 |  |  | 109
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 117 | 0 |
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities | 0 | 0 |
Net Amount, Derivative Assets |  |  | $ 109
Net Amount, Derivative Liabilities | 117 |  |
Credit Derivatives [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Gross Amounts of Recognized Assets, Derivative Assets | 0 | 0 |
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 21,929 | 34,543 |
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 | 0 |
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 21,929 | 34,543 |
Net Amount, Derivative Assets | 0 | 0 |
Net Amount, Derivative Liabilities | 21,929 | 34,543 |
Currency Swaps [Member] | Variable Interest Entities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Gross Amounts of Recognized Assets, Derivative Assets | 48,801 | 36,862 |
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 0 | 0 |
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 48,801 | 36,862 |
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 48,801 | 36,862 |
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 | (48,801) | (36,862) |
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Assets | 0 |  |
Net Amount, Derivative Assets | 0 |  |
Net Amount, Derivative Liabilities | $ (48,801) | $ (36,862) |

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