Acquisitions - Narrative (Detail) $ in Thousands, € in Millions, $ in Millions						3 Months Ended					9 Months Ended
	Apr. 18, 2019 EUR (€)	Apr. 18, 2019 USD ($)	Apr. 18, 2018 AUD ($) metro_area data_center	Apr. 18, 2018 USD ($) metro_area data_center	Apr. 02, 2018 USD ($)	Sep. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Sep. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Sep. 30, 2018 USD ($)
Business Acquisition [Line Items]
Financing obligations, settled													$ 89,655
Revenues						$ 1,396,810		$ 1,283,751			$ 4,145,005		3,761,571
Net income						$ 120,850		124,825	$ 67,618	$ 62,894	$ 382,455		255,337
Switch Datacenters' AMS1 [Member]
Business Acquisition [Line Items]
Cash consideration for acquisition	€ 30.6	$ 34,300
Metronode [Member]
Business Acquisition [Line Items]
Cash consideration for acquisition			$ 1,034	$ 804,600
Data center sites | data_center			10	10
Number of data centers, metro areas | metro_area			6	6
Adjustment in accounting estimate increase (decrease) in deferred tax liabilities							$ (4,200)					$ 31,300
Adjustment in accounting estimate increase (decrease) in goodwill							$ (3,700)					41,600
Adjustment in accounting estimate increase (decrease) in property, plant, and equipment												(10,100)
Adjustment in accounting estimate increase (decrease) in other assets												(10,000)
Adjustment in accounting estimate increase (decrease) in other liabilities												(9,700)
Adjustment in accounting estimate increase (decrease) in deferred tax assets												(4,100)
Adjustment in accounting estimate increase (decrease) in intangible assets												4,800
Metronode [Member] | Customer relationships [Member] | Measurement input, discount rate [Member]
Business Acquisition [Line Items]
Measurement input			0.073	0.073
Infomart Dallas [Member]
Business Acquisition [Line Items]
Cash consideration for acquisition					$ 45,800
Consideration transferred					804,000
Debt instrument, fair value					$ 758,200
Interest rate (percent)					5.00%
Financing obligations, settled					$ 170,300
Other liabilities, settled					1,900
Extinguishment of debt, gain (loss)					$ (19,500)
Adjustment in accounting estimate increase (decrease) in goodwill												(6,200)
Adjustment in accounting estimate increase (decrease) in intangible assets												$ 4,600
Infomart Dallas [Member] | Customer relationships [Member] | Measurement input, discount rate [Member]
Business Acquisition [Line Items]
Measurement input					0.082
Infomart Dallas [Member] | Customer relationships [Member] | Measurement input, royalty rate [Member]
Business Acquisition [Line Items]
Measurement input					0.015
Metronode and Infomart Dallas [Member]
Business Acquisition [Line Items]
Revenues								$ 28,100					52,100
Net income													$ 2,700