Derivative Instruments - Summary of Gross Fair Values of Individual Derivative Instruments (Detail) - Successor [Member] - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Assets, Derivative Assets	$ 204,194	$ 137,124
Gross Amounts of Recognized Liabilities, Derivative Liabilities	537,004	405,487
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities	99,841	52,129
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities	99,841	52,129
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets	104,353	84,995
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities	437,163	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	237,515	176,386
Net Amount, Derivative Assets	104,353	84,995
Net Amount, Derivative Liabilities	199,648	176,972
Variable Interest Entities [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Assets, Derivative Assets	63,167	36,862
Gross Amounts of Recognized Liabilities, Derivative Liabilities	2,124,045	1,965,265
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities	63,167	36,862
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities	63,167	36,862
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	2,060,878	1,928,403
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	0	0
Net Amount, Derivative Assets	0	0
Net Amount, Derivative Liabilities	2,060,878	1,928,403
Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Assets, Derivative Assets	204,194	137,015
Gross Amounts of Recognized Liabilities, Derivative Liabilities	517,441	370,944
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities	99,841	52,129
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities	99,841	52,129
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets	104,353	84,886
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities	417,600	318,815
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities	236,159	176,386
Net Amount, Derivative Assets	104,353	84,886
Net Amount, Derivative Liabilities	181,441	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	2,124,045	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	2,124,045	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	2,124,045	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	1,356	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	1,356	0
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities	1,356	0
Net Amount, Derivative Assets		109
Net Amount, Derivative Liabilities	0
Credit Derivatives [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Liabilities, Derivative Liabilities	18,207	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 Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities	18,207	34,543
Net Amount, Derivative Liabilities	18,207	34,543
Currency Swaps [Member] | Variable Interest Entities [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Assets, Derivative Assets	63,167	36,862
Gross Amounts of Recognized Liabilities, Derivative Liabilities	0	0
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities	63,167	36,862
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities	63,167	36,862
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	(63,167)	(36,862)
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Assets	0	0
Net Amount, Derivative Assets	0	0
Net Amount, Derivative Liabilities	$ (63,167)	$ (36,862)