Segment Information - Revenue Information on Services Basis (Detail) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenue from External Customer [Line Items]
Revenue	$ 924,676	$ 900,510	$ 844,156	$ 686,649	$ 2,669,342	$ 1,995,405
Recurring revenues
Revenue from External Customer [Line Items]
Revenue	877,494	851,771	797,094	646,721	2,526,359	1,883,069
Recurring revenues | Colocation
Revenue from External Customer [Line Items]
Revenue	680,541	662,669	619,893	511,652	1,963,103	1,489,807
Recurring revenues | Interconnection
Revenue from External Customer [Line Items]
Revenue	135,489	132,240	123,954	110,568	391,683	316,887
Recurring revenues | Managed infrastructure
Revenue from External Customer [Line Items]
Revenue	52,986	48,724	47,987	22,327	149,697	69,648
Recurring revenues | Other
Revenue from External Customer [Line Items]
Revenue	8,478	8,138	5,260	2,174	21,876	6,727
Non-recurring revenues
Revenue from External Customer [Line Items]
Revenue	$ 47,182	$ 48,739	$ 47,062	$ 39,928	$ 142,983	$ 112,336