Segment Information - Revenue Information on Services Basis (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenue from External Customer [Line Items]
Revenue	$ 1,152,261	$ 924,676	$ 3,168,207	$ 2,669,342
Recurring Revenues [Member]
Revenue from External Customer [Line Items]
Revenue	1,089,033	877,006	2,997,521	2,524,932
Recurring Revenues [Member] | Colocation [Member]
Revenue from External Customer [Line Items]
Revenue	842,680	678,959	2,316,433	1,958,582
Recurring Revenues [Member] | Interconnection [Member]
Revenue from External Customer [Line Items]
Revenue	179,544	137,501	493,288	397,147
Recurring Revenues [Member] | Managed infrastructure services [Member]
Revenue from External Customer [Line Items]
Revenue	63,278	55,146	176,080	156,302
Recurring Revenues [Member] | Other [Member]
Revenue from External Customer [Line Items]
Revenue	3,531	5,400	11,720	12,901
Non-recurring Revenues [Member]
Revenue from External Customer [Line Items]
Revenue	$ 63,228	$ 47,670	$ 170,686	$ 144,410