Balance Sheet Components - Carrying Amount of Goodwill by Geographical Regions (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Goodwill [Roll Forward]
Balance, Beginning	$ 4,411,762	$ 2,986,064
Impact of foreign currency exchange	(188,313)	166,443
Balance, Ending	4,836,388	4,411,762
Verizon
Goodwill [Roll Forward]
Purchase accounting adjustments		1,095,262
Other 2017 acquisitions
Goodwill [Roll Forward]
Purchase accounting adjustments		163,993
Infomart Dallas
Goodwill [Roll Forward]
Purchase accounting adjustments	197,378
Metronode
Goodwill [Roll Forward]
Purchase accounting adjustments	413,871
Other 2018 acquisitions
Goodwill [Roll Forward]
Purchase accounting adjustments	1,690
Reportable geographical components \| Americas
Goodwill [Roll Forward]
Balance, Beginning	1,561,512	469,438
Impact of foreign currency exchange	(13,419)	(3,188)
Balance, Ending	1,745,804	1,561,512
Reportable geographical components \| Americas \| Verizon
Goodwill [Roll Forward]
Purchase accounting adjustments		1,095,262
Reportable geographical components \| Americas \| Infomart Dallas
Goodwill [Roll Forward]
Purchase accounting adjustments	197,378
Reportable geographical components \| Americas \| Other 2018 acquisitions
Goodwill [Roll Forward]
Purchase accounting adjustments	333
Reportable geographical components \| EMEA
Goodwill [Roll Forward]
Balance, Beginning	2,610,899	2,281,306
Impact of foreign currency exchange	(138,092)	165,600
Balance, Ending	2,474,164	2,610,899
Reportable geographical components \| EMEA \| Other 2017 acquisitions
Goodwill [Roll Forward]
Purchase accounting adjustments		163,993
Reportable geographical components \| EMEA \| Other 2018 acquisitions
Goodwill [Roll Forward]
Purchase accounting adjustments	1,357
Reportable geographical components \| Asia-Pacific
Goodwill [Roll Forward]
Balance, Beginning	239,351	235,320
Impact of foreign currency exchange	(36,802)	4,031
Balance, Ending	616,420	$ 239,351
Reportable geographical components \| Asia-Pacific \| Metronode
Goodwill [Roll Forward]
Purchase accounting adjustments	$ 413,871

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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