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Subsequent Events (Detail)					3 Months Ended		9 Months Ended
Subsequent Events (Detail)	Oct. 28, 2020 $ / shares	Oct. 23, 2020 USD ($)	Oct. 23, 2020 EUR (€)	Jul. 08, 2020 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2020 data_center	Oct. 30, 2020 USD ($)	Oct. 07, 2020 USD ($)	Oct. 01, 2020 data_center	Sep. 30, 2020 EUR (€)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Subsequent Event [Line Items]
Loss on debt extinguishment					$ 93,494,000	$ (315,000)	$ 101,803,000	$ 67,000
Amount of debt discounts and debt issuance costs					3,601,000		3,601,000							$ 4,849,000
Long term debt, gross					1,321,864,000		1,321,864,000							1,370,118,000
ATM Program
Subsequent Event [Line Items]
Sale of stock, equity offering agreement, authorized															$ 750,000,000.0
Subsequent Event
Subsequent Event [Line Items]
Cash dividends declared (in dollars per share) \| $ / shares	$ 2.66
Subsequent Event \| ATM Program
Subsequent Event [Line Items]
Sale of stock, equity offering agreement, authorized										$ 1,500,000,000
Subsequent Event \| Bell Acquisition
Subsequent Event [Line Items]
Data centers purchased \| data_center									1			12
Senior Notes
Subsequent Event [Line Items]
Loss on debt extinguishment				$ 93,500,000
Amount representing redemption premium				77,800,000
Write off of unamortized debt issuance				$ 15,700,000
Long term debt, gross					$ 9,294,800,000		$ 9,294,800,000							9,029,211,000
Senior Notes \| 1.000% Senior Notes due 2025 \| Subsequent Event
Subsequent Event [Line Items]
Interest rate (percent)											1.00%
Amount of debt discounts and debt issuance costs											$ 5,500,000
Aggregate principal debt amount issued											$ 700,000,000.0
Senior Notes \| 1.550% Senior Notes due 2028 \| Subsequent Event
Subsequent Event [Line Items]
Interest rate (percent)											1.55%
Amount of debt discounts and debt issuance costs											$ 5,200,000
Aggregate principal debt amount issued											$ 650,000,000.0
Senior Notes \| 2.950% Senior Notes due 2051 \| Subsequent Event
Subsequent Event [Line Items]
Interest rate (percent)											2.95%
Amount of debt discounts and debt issuance costs											$ 5,300,000
Aggregate principal debt amount issued											$ 500,000,000.0
Senior Notes \| 2.875% Euro Senior Notes due 2025
Subsequent Event [Line Items]
Interest rate (percent)					2.875%		2.875%						2.875%
Senior Notes \| 2.875% Euro Senior Notes due 2025 \| Subsequent Event
Subsequent Event [Line Items]
Redemption of senior debt \| €			€ 1,000,000,000.0
Senior Notes \| 2.875% Euro Senior Notes due 2026
Subsequent Event [Line Items]
Interest rate (percent)					2.875%		2.875%						2.875%
Long term debt, gross					$ 1,172,400,000		$ 1,172,400,000						€ 1,000,000,000.0	$ 1,122,000,000
Senior Notes \| 2.875% Euro Senior Notes due 2026 \| Subsequent Event
Subsequent Event [Line Items]
Redemption of senior debt \| €			€ 500,000,000
Senior Notes \| 2.875% Euro Senior Notes due 2025 and 2026 \| Subsequent Event
Subsequent Event [Line Items]
Loss on debt extinguishment		$ 44,200,000
Amount representing redemption premium		29,300,000
Write off of unamortized debt issuance		$ 14,900,000