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Fair Value Measurements - Summary of Non-Recurring Fair Value Measurement (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Property and equipment
Net Carrying Value	$ 722,646		$ 722,646		$ 815,009
Goodwill
Excess purchase price over fair value of net assets acquired	3,874,743		3,874,743		3,821,609
Other intangible assets
Net Carrying Value	1,345,646		1,345,646		1,367,913
Assets, Fair Value Disclosure [Abstract]
Net Carrying Value	19,730,360		19,730,360		$ 18,039,143
Total Impairment Charges	$ 0	$ 0	$ 0	$ 75,171
Fair Value, Nonrecurring
Property and equipment
Net Carrying Value		9,565		9,565
Total Impairment Charges				21,663
Goodwill
Excess purchase price over fair value of net assets acquired		431,389		431,389
Total Impairment Charges				25,000
Other intangible assets
Net Carrying Value		12,842		12,842
Total Impairment Charges				28,508
Assets, Fair Value Disclosure [Abstract]
Net Carrying Value		453,796		453,796
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
Assets, Fair Value Disclosure [Abstract]
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
Assets, Fair Value Disclosure [Abstract]
Total assets at fair value		0		0
Fair Value, Nonrecurring | Level 3
Property and equipment
Fair Value Measured and Recorded		9,565		9,565
Goodwill
Fair Value Measured and Recorded		431,389		431,389
Other intangible assets
Fair Value Measured and Recorded		12,842		12,842
Assets, Fair Value Disclosure [Abstract]
Total assets at fair value		$ 453,796		$ 453,796

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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