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Fair Value Measurements - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Intangible asset impairment   $ 89,037,000    
Gain associated with remeasuring of investment in a previously unconsolidated subsidiary to fair value as of date $ 92,624,000   $ 92,624,000  
Percentage of remeasuring investment in previously unconsolidated subsidiary 50.00%   50.00%  
Remaining controlling interest acquired percentage 50.00%   50.00%  
Fair value of investment in unconsolidated subsidiary at acquisition date     $ 110,100,000  
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%
Estimated Fair Value [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Senior term loans   $ 734,000,000.0   $ 757,000,000.0
Estimated Fair Value [Member] | 4.875% Senior Notes [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Senior notes   671,700,000   616,400,000
Estimated Fair Value [Member] | 5.25% Senior Notes [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Senior notes   477,800,000   443,700,000
Actual Carrying Value [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Senior term loans   731,800,000   751,300,000
Actual Carrying Value [Member] | 4.875% Senior Notes [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Senior notes   593,400,000   592,800,000
Actual Carrying Value [Member] | 5.25% Senior Notes [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Senior notes   422,900,000   $ 422,700,000
Previously Unconsolidated Subsidiary [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Gain associated with remeasuring of investment in a previously unconsolidated subsidiary to fair value as of date $ 92,600,000   $ 92,600,000  
Fair Value Measurements, Non-recurring [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets, fair value disclosure, nonrecurring   0    
Liabilities, fair value disclosure, nonrecurring   0    
Intangible asset impairment   $ 89,037,000