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Derivative Instruments - Summary of Gross Fair Values of Individual Derivative Instruments (Detail) - Successor [Member] - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]    
Gross Amounts of Recognized Assets, Derivative Assets   $ 73,826
Gross Amounts of Recognized Liabilities, Derivative Liabilities   83,409
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets $ 50,262 73,199
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 0  
Derivative Assets (Liabilities), at Fair Value, Net 1,968 1,522
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities 61,331 82,782
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 59,363  
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   81,260
Net Amount, Derivative Assets 50,262 73,199
Derivative Asset, Fair Value, Gross Asset 50,699  
Derivative Asset, Fair Value, Amount Offset Against Collateral 437 627
Derivative liabilities 61,768  
Derivative Liability, Fair Value, Amount Offset Against Collateral 437 627
Variable Interest Entity, Primary Beneficiary [Member]    
Derivatives, Fair Value [Line Items]    
Gross Amounts of Recognized Assets, Derivative Assets   54,877
Gross Amounts of Recognized Liabilities, Derivative Liabilities   2,205,264
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets 61,543 54,877
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 0  
Derivative Assets (Liabilities), at Fair Value, Net 1,657,173 2,205,264
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities 1,657,173 2,205,264
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 0  
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
Net Amount, Derivative Assets 61,543 54,877
Derivative Asset, Fair Value, Gross Asset 61,543  
Derivative Asset, Fair Value, Amount Offset Against Collateral 0 0
Derivative liabilities 1,657,173  
Derivative Liability, Fair Value, Amount Offset Against Collateral 0 0
Interest Rate Swap [Member]    
Derivatives, Fair Value [Line Items]    
Gross Amounts of Recognized Assets, Derivative Assets   73,826
Gross Amounts of Recognized Liabilities, Derivative Liabilities   81,495
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets 50,262 73,199
Derivative Assets (Liabilities), at Fair Value, Net 793 956
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities 59,728 80,868
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 58,935  
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities   79,912
Net Amount, Derivative Assets 50,262 73,199
Derivative Asset, Fair Value, Gross Asset 50,699  
Derivative Asset, Fair Value, Amount Offset Against Collateral 437 627
Derivative liabilities 60,165  
Derivative Liability, Fair Value, Amount Offset Against Collateral 437 627
Interest Rate Swap [Member] | Variable Interest Entity, Primary Beneficiary [Member]    
Derivatives, Fair Value [Line Items]    
Gross Amounts of Recognized Liabilities, Derivative Liabilities   2,205,264
Derivative Assets (Liabilities), at Fair Value, Net 1,657,173 2,205,264
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities 1,657,173 2,205,264
Derivative liabilities 1,657,173  
Future [Member]    
Derivatives, Fair Value [Line Items]    
Gross Amounts of Recognized Liabilities, Derivative Liabilities   1,348
Derivative Assets (Liabilities), at Fair Value, Net 0 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities 428 1,348
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 428  
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities   1,348
Derivative liabilities 428  
Derivative Liability, Fair Value, Amount Offset Against Collateral 0 0
Credit Derivatives [Member]    
Derivatives, Fair Value [Line Items]    
Gross Amounts of Recognized Liabilities, Derivative Liabilities   566
Derivative Assets (Liabilities), at Fair Value, Net 1,175 566
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities 1,175 566
Derivative liabilities 1,175  
Derivative Liability, Fair Value, Amount Offset Against Collateral 0 0
Currency Swaps [Member] | Variable Interest Entity, Primary Beneficiary [Member]    
Derivatives, Fair Value [Line Items]    
Gross Amounts of Recognized Assets, Derivative Assets   54,877
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets 61,543 54,877
Net Amount, Derivative Assets 61,543 $ 54,877
Derivative Asset, Fair Value, Gross Asset 61,543  
Derivative Asset, Fair Value, Amount Offset Against Collateral $ 0