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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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Acquisitions - Acquired Identifiable Intangible Assets (Detail) - USD ($) $ in Thousands			12 Months Ended
	Jan. 15, 2016	Nov. 02, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Digital Realty
Business Acquisition [Line Items]
Fair value of intangible assets acquired				$ 11,758
Digital Realty \| In-place leases
Business Acquisition [Line Items]
Acquired intangible assets, Estimated useful lives (years)			4 years 3 months 18 days
Telecity Group plc
Business Acquisition [Line Items]
Fair value of intangible assets acquired				$ 694,243
Telecity Group plc \| Favorable leasehold interests
Business Acquisition [Line Items]
Fair value of intangible assets acquired	$ 30,254
Weighted-average estimated useful lives (years)	19 years 8 months 12 days
Telecity Group plc \| Favorable leasehold interests \| Minimum
Business Acquisition [Line Items]
Acquired intangible assets, Estimated useful lives (years)	2 years
Telecity Group plc \| Favorable leasehold interests \| Maximum
Business Acquisition [Line Items]
Acquired intangible assets, Estimated useful lives (years)	25 years 5 months
Telecity Group plc \| Customer relationships
Business Acquisition [Line Items]
Fair value of intangible assets acquired	$ 591,956
Acquired intangible assets, Estimated useful lives (years)	13 years 6 months
Weighted-average estimated useful lives (years)	13 years 6 months
Telecity Group plc \| Trade names
Business Acquisition [Line Items]
Fair value of intangible assets acquired	$ 72,033
Acquired intangible assets, Estimated useful lives (years)	1 year 6 months
Weighted-average estimated useful lives (years)	1 year 6 months
Bit-isle
Business Acquisition [Line Items]
Fair value of intangible assets acquired					$ 111,374
Bit-isle \| Favorable leasehold interests
Business Acquisition [Line Items]
Fair value of intangible assets acquired		$ 2,410
Acquired intangible assets, Estimated useful lives (years)		18 years
Weighted-average estimated useful lives (years)		18 years
Bit-isle \| Customer relationships
Business Acquisition [Line Items]
Fair value of intangible assets acquired		$ 105,434
Acquired intangible assets, Estimated useful lives (years)		13 years
Weighted-average estimated useful lives (years)		13 years
Bit-isle \| Trade names
Business Acquisition [Line Items]
Fair value of intangible assets acquired		$ 3,455
Acquired intangible assets, Estimated useful lives (years)		2 years
Weighted-average estimated useful lives (years)		2 years
Bit-isle \| Other intangible assets
Business Acquisition [Line Items]
Fair value of intangible assets acquired		$ 75
Acquired intangible assets, Estimated useful lives (years)		3 months
Weighted-average estimated useful lives (years)		3 months