Segment Information - Revenue Information by Category (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue from External Customer [Line Items]
Revenues	$ 4,368,428	$ 3,611,989	$ 2,725,867
Recurring revenues
Revenue from External Customer [Line Items]
Revenues	4,120,120	3,417,374	2,569,141
Recurring revenues | Colocation
Revenue from External Customer [Line Items]
Revenues	3,178,145	2,647,094	2,019,875
Recurring revenues | Interconnection
Revenue from External Customer [Line Items]
Revenues	681,173	543,045	441,749
Recurring revenues | Managed infrastructure
Revenue from External Customer [Line Items]
Revenues	245,169	210,292	96,836
Recurring revenues | Rental
Revenue from External Customer [Line Items]
Revenues	15,633	16,943	10,681
Non-recurring revenues
Revenue from External Customer [Line Items]
Revenues	$ 248,308	$ 194,615	$ 156,726