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Intangible Assets and Goodwill (Changes in Intangible Assets Other Than Goodwill) (Detail) - USD ($)
$ in Thousands
5 Months Ended 7 Months Ended 12 Months Ended
Jun. 03, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jun. 04, 2018
Definite-Lived Intangible Assets          
Amortization $ (7,900) $ (18,900) $ (33,500) $ (56,200)  
Definite-Lived Intangible Assets, Ending Balance   172,351      
Impact of fresh start accounting   147,900      
Intangible Assets, Net          
Amortization (7,900) (18,900) (33,500) $ (56,200)  
Predecessor          
Definite-Lived Intangible Assets          
Amortization (7,938)        
Intangible Assets, Net          
Intangible Assets Total, Beginning Balance 1,286,803 1,278,865      
Amortization (7,938)        
Intangible Assets Total, Ending Balance 1,278,865   1,286,803    
Predecessor | Finite-Lived Intangible Assets          
Definite-Lived Intangible Assets          
Definite-Lived Intangible Assets, Beginning Balance 82,994 75,056      
Amortization (7,938)        
Definite-Lived Intangible Assets, Ending Balance 75,056   82,994    
Intangible Assets, Net          
Amortization (7,938)        
Predecessor | Indefinite-lived Intangible Assets          
Indefinite-Lived Intangible Assets          
Indefinite-Lived Intangible Assets, Beginning Balance 1,203,809 1,203,809      
Indefinite-Lived Intangible Assets, Ending Balance $ 1,203,809   $ 1,203,809    
Successor          
Indefinite-Lived Intangible Assets          
Acquisitions   17,476      
Definite-Lived Intangible Assets          
Amortization   (18,885)      
Impact of fresh start accounting         $ (147,907)
Intangible Assets, Net          
Disposition   (362)      
Amortization   (18,885)      
Intangible Assets Total, Ending Balance   1,129,187      
Successor | Finite-Lived Intangible Assets          
Definite-Lived Intangible Assets          
Amortization   (18,885)      
Definite-Lived Intangible Assets, Ending Balance   172,351      
Impact of fresh start accounting         116,202
Intangible Assets, Net          
Disposition   (22)      
Amortization   (18,885)      
Successor | Indefinite-lived Intangible Assets          
Indefinite-Lived Intangible Assets          
Acquisitions   17,476      
Indefinite-Lived Intangible Assets, Ending Balance   956,836      
Definite-Lived Intangible Assets          
Impact of fresh start accounting         $ (264,109)
Intangible Assets, Net          
Disposition   $ (340)