Segment Information - Revenue Information on Services Basis (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenue from External Customer [Line Items]
Revenue	$ 949,525	$ 844,156
Recurring Revenues [Member]
Revenue from External Customer [Line Items]
Revenue	898,440	796,620
Recurring Revenues [Member] | Colocation [Member]
Revenue from External Customer [Line Items]
Revenue	691,522	618,395
Recurring Revenues [Member] | Interconnection [Member]
Revenue from External Customer [Line Items]
Revenue	148,060	125,587
Recurring Revenues [Member] | Managed infrastructure services [Member]
Revenue from External Customer [Line Items]
Revenue	54,609	50,310
Recurring Revenues [Member] | Rental [Member]
Revenue from External Customer [Line Items]
Revenue	4,249	2,328
Non-recurring Revenues [Member]
Revenue from External Customer [Line Items]
Revenue	$ 51,085	$ 47,536