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Acquisitions - Narrative (Detail) $ in Thousands, € in Millions					3 Months Ended				6 Months Ended
	Mar. 02, 2020 USD ($)	Jan. 08, 2020 USD ($) data_center	Apr. 18, 2019 EUR (€)	Apr. 18, 2019 USD ($)	Dec. 31, 2020 USD ($) data_center_site	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)
Business Acquisition [Line Items]
Cash paid to accelerate vesting						$ 75,844		$ 61,519	$ 156,410	$ 110,542
Transaction costs for acquisitions						13,617		$ 2,774	25,147	$ 5,245
Packet Host, Inc.
Business Acquisition [Line Items]
Consideration transferred	$ 290,300
Cash paid to accelerate vesting							$ 16,100
Value of equity issued	$ 30,200
Vesting period of equity issued	3 years
Adjustment to provisional amounts, intangible assets						5,900
Adjustment to provisional amounts, goodwill						4,500
Packet Host, Inc. | Trade names | Measurement input, royalty rate
Business Acquisition [Line Items]
Measurement input	0.010
Packet Host, Inc. | Trade names | Measurement input, discount rate
Business Acquisition [Line Items]
Measurement input	0.080
Packet Host, Inc. | Customer relationships | Measurement input, discount rate
Business Acquisition [Line Items]
Measurement input	0.080
Axtel
Business Acquisition [Line Items]
Consideration transferred		$ 189,000
Data centers purchased | data_center		3
Cash consideration for acquisition		$ 175,000
Value added taxes		$ 14,000
Axtel | Customer relationships | Measurement input, discount rate
Business Acquisition [Line Items]
Measurement input		0.133
Packet and Axtel Acquisitions
Business Acquisition [Line Items]
Transaction costs for acquisitions									10,500
Revenues from acquisitions included in results of operations						13,300			21,500
Net loss of acquisitions included in earnings						$ 7,000			$ 20,300
Switch Datacenters' AMS1
Business Acquisition [Line Items]
Cash consideration for acquisition			€ 30.6	$ 34,300
Forecast | Bell Acquisition
Business Acquisition [Line Items]
Cash consideration for acquisition					$ 750,000
Data center sites purchased | data_center_site					13

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