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Fair Value Measurements - Summary of Non-Recurring Fair Value Measurement (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Net Asset (Liability) [Abstract]        
Property and equipment   $ 815,009,000 $ 836,206,000  
Goodwill   3,821,609,000 3,753,493,000 $ 3,652,309,000
Other intangible assets   1,367,913,000 1,379,546,000  
Total   18,039,143,000 16,197,196,000  
Asset Impairment Charges [Abstract]        
Goodwill $ 25,000,000.0 25,000,000 0  
Total   88,676,000 89,787,000 $ 0
Non-recurring        
Fair Value, Net Asset (Liability) [Abstract]        
Property and equipment   12,870,000    
Goodwill   443,305,000    
Other intangible assets   12,562,000 14,753,000  
Total   468,737,000    
Asset Impairment Charges [Abstract]        
Property and equipment   29,168,000    
Goodwill   25,000,000    
Other intangible assets   34,508,000 89,787,000  
Total   88,676,000    
Non-recurring | Level 1        
Assets, Fair Value Disclosure [Abstract]        
Property and equipment   0    
Goodwill   0    
Other intangible assets   0 0  
Total assets at fair value   0    
Non-recurring | Level 2        
Assets, Fair Value Disclosure [Abstract]        
Property and equipment   12,870,000    
Goodwill   0    
Other intangible assets   0 0  
Total assets at fair value   12,870,000    
Non-recurring | Level 3        
Assets, Fair Value Disclosure [Abstract]        
Property and equipment   0    
Goodwill   443,305,000    
Other intangible assets   12,562,000 $ 14,753,000  
Total assets at fair value   $ 455,867,000