Segment Information - Revenue Information by Category (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenue from External Customer [Line Items]
Revenue	$ 2,725,867	$ 2,443,776	$ 2,152,766
Recurring Revenues [Member]
Revenue from External Customer [Line Items]
Revenue	2,569,141	2,317,790	2,049,962
Recurring Revenues [Member] | Colocation [Member]
Revenue from External Customer [Line Items]
Revenue	2,024,963	1,829,812	1,628,179
Recurring Revenues [Member] | Interconnection [Member]
Revenue from External Customer [Line Items]
Revenue	435,809	372,350	319,863
Recurring Revenues [Member] | Managed infrastructure services [Member]
Revenue from External Customer [Line Items]
Revenue	97,688	105,292	97,400
Recurring Revenues [Member] | Rental [Member]
Revenue from External Customer [Line Items]
Revenue	10,681	10,336	4,520
Non-recurring Revenues [Member]
Revenue from External Customer [Line Items]
Revenue	$ 156,726	$ 125,986	$ 102,804