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Fair Value Measurements - Summary of Non-Recurring Fair Value Measurement (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Property and equipment      
Net Carrying Value $ 774,301   $ 815,009
Goodwill      
Net Carrying Value 3,804,678   3,821,609
Other intangible assets      
Net Carrying Value 1,370,484   1,367,913
Total      
Net Carrying Value 17,248,728   $ 18,039,143
Total Impairment Charges $ 0 $ 75,171  
Fair Value, Nonrecurring      
Property and equipment      
Net Carrying Value   10,185  
Total Impairment Charges   21,663  
Goodwill      
Net Carrying Value   418,861  
Total Impairment Charges   25,000  
Other intangible assets      
Net Carrying Value   13,403  
Total Impairment Charges   28,508  
Total      
Net Carrying Value   442,449  
Total Impairment Charges   75,171  
Fair Value, Nonrecurring | Level 1      
Property and equipment      
Fair Value Measured and Recorded   0  
Goodwill      
Fair Value Measured and Recorded   0  
Other intangible assets      
Fair Value Measured and Recorded   0  
Total      
Total assets at fair value   0  
Fair Value, Nonrecurring | Level 2      
Property and equipment      
Fair Value Measured and Recorded   0  
Goodwill      
Fair Value Measured and Recorded   0  
Other intangible assets      
Fair Value Measured and Recorded   0  
Total      
Total assets at fair value   0  
Fair Value, Nonrecurring | Level 3      
Property and equipment      
Fair Value Measured and Recorded   10,185  
Goodwill      
Fair Value Measured and Recorded   418,861  
Other intangible assets      
Fair Value Measured and Recorded   13,403  
Total      
Total assets at fair value   $ 442,449