Acquisitions - Acquired Identifiable Intangible Assets (Detail) - USD ($) $ in Thousands	Jan. 15, 2016	Nov. 02, 2015
Telecity Group plc [Member] \| Customer relationships [Member]
Business Acquisition [Line Items]
Fair value of intangible assets acquired	$ 764,550
Estimated useful lives	13 years 6 months
Weighted-average estimated useful lives	13 years 6 months
Telecity Group plc [Member] \| Trade name [Member]
Business Acquisition [Line Items]
Fair value of intangible assets acquired	$ 72,033
Estimated useful lives	1 year 6 months
Weighted-average estimated useful lives	1 year 6 months
Telecity Group plc [Member] \| Favorable leases [Member]
Business Acquisition [Line Items]
Fair value of intangible assets acquired	$ 25,234
Weighted-average estimated useful lives	13 years 7 months 6 days
Telecity Group plc [Member] \| Favorable leases [Member] \| Minimum [Member]
Business Acquisition [Line Items]
Estimated useful lives	2 years 4 months 24 days
Telecity Group plc [Member] \| Favorable leases [Member] \| Maximum [Member]
Business Acquisition [Line Items]
Estimated useful lives	33 years
Bit-isle [Member] \| Customer relationships [Member]
Business Acquisition [Line Items]
Fair value of intangible assets acquired		$ 105,434
Estimated useful lives		13 years
Weighted-average estimated useful lives		13 years
Bit-isle [Member] \| Trade name [Member]
Business Acquisition [Line Items]
Fair value of intangible assets acquired		$ 3,455
Estimated useful lives		2 years
Weighted-average estimated useful lives		2 years
Bit-isle [Member] \| Favorable solar contracts [Member]
Business Acquisition [Line Items]
Fair value of intangible assets acquired		$ 2,410
Estimated useful lives		18 years
Weighted-average estimated useful lives		18 years
Bit-isle [Member] \| Other intangible assets [Member]
Business Acquisition [Line Items]
Fair value of intangible assets acquired		$ 75
Estimated useful lives		3 months
Weighted-average estimated useful lives		3 months

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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=26713463&loc=d3e16265-109275

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