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Fair Value Measurements - Summary of Non-Recurring Fair Value Measurement (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Property and equipment          
Net Carrying Value $ 741,946   $ 741,946   $ 815,009
Goodwill          
Excess purchase price over fair value of net assets acquired 3,892,134   3,892,134   3,821,609
Other intangible assets          
Net Carrying Value 1,345,143   1,345,143   1,367,913
Total          
Net Carrying Value 18,458,352   18,458,352   $ 18,039,143
Total Impairment Charges $ 0 $ 0 $ 0 $ 75,171  
Fair Value, Nonrecurring          
Property and equipment          
Net Carrying Value   9,875   9,875  
Total Impairment Charges       21,663  
Goodwill          
Excess purchase price over fair value of net assets acquired   421,574   421,574  
Total Impairment Charges       25,000  
Other intangible assets          
Net Carrying Value   13,123   13,123  
Total Impairment Charges       28,508  
Total          
Net Carrying Value   444,572   444,572  
Total Impairment Charges       75,171  
Fair Value, Nonrecurring | Level 1          
Property and equipment          
Fair Value Measured and Recorded   0   0  
Goodwill          
Fair Value Measured and Recorded   0   0  
Other intangible assets          
Fair Value Measured and Recorded   0   0  
Total          
Total assets at fair value   0   0  
Fair Value, Nonrecurring | Level 2          
Property and equipment          
Fair Value Measured and Recorded   0   0  
Goodwill          
Fair Value Measured and Recorded   0   0  
Other intangible assets          
Fair Value Measured and Recorded   0   0  
Total          
Total assets at fair value   0   0  
Fair Value, Nonrecurring | Level 3          
Property and equipment          
Fair Value Measured and Recorded   9,875   9,875  
Goodwill          
Fair Value Measured and Recorded   421,574   421,574  
Other intangible assets          
Fair Value Measured and Recorded   13,123   13,123  
Total          
Total assets at fair value   $ 444,572   $ 444,572