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Fair Value Measurements - Summary of Non-Recurring Fair Value Measurement (Detail) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Property and equipment, net $ 818,333   $ 836,206
Goodwill, Net Carrying Value 3,744,269   3,753,493
Other intangible assets, Net Carrying Value 1,333,917   1,379,546
Other intangible assets, Total Impairment Charges   $ 89,000  
Net Carrying Value 16,347,076   $ 16,197,196
Total Impairment Charges 75,171 89,037  
Fair Value Measurements, Non-recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Property and equipment, net 9,565    
Property and equipment, Total Impairment Charges 21,663    
Goodwill, Net Carrying Value 431,389    
Goodwill, Total Impairment Charges 25,000    
Other intangible assets, Net Carrying Value 12,842 16,000  
Other intangible assets, Total Impairment Charges 28,508 89,037  
Net Carrying Value 453,796    
Total Impairment Charges 75,171    
Fair Value Measurements, Non-recurring [Member] | Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Property and equipment, Fair Value Measured and Recorded Using 9,565    
Goodwill, Fair Value Measured and Recorded Using 431,389    
Other intangible assets, Fair Value Measured and Recorded Using 12,842 $ 16,000  
Fair Value Measured and Recorded Using $ 453,796