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Acquisitions - Acquired Identifiable Intangible Assets (Detail) - USD ($) $ in Thousands			12 Months Ended
	Apr. 18, 2018	Apr. 02, 2018	Dec. 31, 2018
Metronode
Business Acquisition [Line Items]
Fair value of intangible assets acquired			$ 128,229
Metronode \| Customer relationships
Business Acquisition [Line Items]
Fair value of intangible assets acquired	$ 128,229
Acquired intangible assets, estimated useful lives (years)	20 years
Weighted-average estimated useful lives (years)	20 years
Infomart Dallas
Business Acquisition [Line Items]
Fair value of intangible assets acquired			$ 65,847
Infomart Dallas \| Customer relationships
Business Acquisition [Line Items]
Fair value of intangible assets acquired		$ 35,860
Acquired intangible assets, estimated useful lives (years)		20 years
Weighted-average estimated useful lives (years)		20 years
Infomart Dallas \| In-place leases
Business Acquisition [Line Items]
Fair value of intangible assets acquired		$ 19,960
Weighted-average estimated useful lives (years)		6 years 9 months 18 days
Infomart Dallas \| In-place leases \| Minimum
Business Acquisition [Line Items]
Acquired intangible assets, estimated useful lives (years)		3 years 7 months 6 days
Infomart Dallas \| In-place leases \| Maximum
Business Acquisition [Line Items]
Acquired intangible assets, estimated useful lives (years)		7 years 6 months
Infomart Dallas \| Trade names
Business Acquisition [Line Items]
Fair value of intangible assets acquired		$ 9,552
Acquired intangible assets, estimated useful lives (years)		20 years
Weighted-average estimated useful lives (years)		20 years
Infomart Dallas \| Favorable leasehold interests
Business Acquisition [Line Items]
Fair value of intangible assets acquired		$ 475
Weighted-average estimated useful lives (years)		7 years
Infomart Dallas \| Favorable leasehold interests \| Minimum
Business Acquisition [Line Items]
Acquired intangible assets, estimated useful lives (years)		3 years 7 months 6 days
Infomart Dallas \| Favorable leasehold interests \| Maximum
Business Acquisition [Line Items]
Acquired intangible assets, estimated useful lives (years)		7 years 6 months