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Fair Value Measurements - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value measurements assets, significant transfers from level 1 to level 2 $ 0   $ 0
Fair value measurements assets, significant transfers from level 2 to level 1 0   0
Fair value measurements liabilities, significant transfers from level 1 to level 2 0   0
Fair value measurements liabilities, significant transfers from level 2 to level 1 0   0
Intangible asset impairment $ 89,000,000    
4.875% Senior Notes [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Interest rate of long-term debt 4.875% 4.875%  
5.25% Senior Notes [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Interest rate of long-term debt 5.25% 5.25%  
Estimate of Fair Value [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior term loans $ 725,000,000 $ 757,000,000  
Estimate of Fair Value [Member] | 4.875% Senior Notes [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior notes 634,800,000 616,400,000  
Estimate of Fair Value [Member] | 5.25% Senior Notes [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior notes 455,700,000 443,700,000  
Actually Carrying Value [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior term loans 744,000,000 751,300,000  
Actually Carrying Value [Member] | 4.875% Senior Notes [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior notes 593,000,000 592,800,000  
Actually Carrying Value [Member] | 5.25% Senior Notes [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior notes 422,800,000 $ 422,700,000  
Fair Value, Measurements, Nonrecurring [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Intangible asset impairment $ 89,037,000    
Assets, fair value disclosure, nonrecurring     0
Liabilities, fair value disclosure, nonrecurring     $ 0