Segment Information - Revenue Information on Services Basis (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenue from External Customer [Line Items]
Revenue	$ 1,066,421	$ 900,510	$ 2,015,946	$ 1,744,666
Recurring Revenues [Member]
Revenue from External Customer [Line Items]
Revenue	1,010,048	851,306	1,908,488	1,647,926
Recurring Revenues [Member] | Colocation [Member]
Revenue from External Customer [Line Items]
Revenue	782,231	661,228	1,473,753	1,279,623
Recurring Revenues [Member] | Interconnection [Member]
Revenue from External Customer [Line Items]
Revenue	165,684	134,059	313,744	259,646
Recurring Revenues [Member] | Managed infrastructure services [Member]
Revenue from External Customer [Line Items]
Revenue	58,193	50,846	112,802	101,156
Recurring Revenues [Member] | Rental [Member]
Revenue from External Customer [Line Items]
Revenue	3,940	5,173	8,189	7,501
Non-recurring Revenues [Member]
Revenue from External Customer [Line Items]
Revenue	$ 56,373	$ 49,204	$ 107,458	$ 96,740