Acquisitions - Preliminary Purchase Price Allocation (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	May 01, 2017	Dec. 31, 2016	Aug. 01, 2016	Jan. 15, 2016
Business Acquisition [Line Items]
Assets held for sale	$ 0		$ 0
Goodwill	4,225,553		2,986,064
Liabilities held for sale	$ 0		$ 0
Verizon [Member]
Business Acquisition [Line Items]
Cash and cash equivalents		$ 1,073
Accounts receivable		319
Other current assets		7,319
Property, plant and equipment		837,559
Goodwill		1,087,571
Intangible assets		1,702,900
Total assets acquired		3,636,741
Accounts payable and accrued liabilities		(1,725)
Other current liabilities		(320)
Capital lease and other financing obligations		(17,025)
Deferred tax liabilities		(16,878)
Other liabilities		(6,107)
Net assets acquired		$ 3,594,686
Digital Realty [Member]
Business Acquisition [Line Items]
Cash and cash equivalents				$ 4,073
Accounts receivable				1,507
Other current assets				794
Property, plant and equipment				143,972
Goodwill				48,835
Intangible assets				11,758
Other assets				81
Total assets acquired				211,020
Accounts payable and accrued liabilities				(2,044)
Other current liabilities				(2,798)
Deferred tax liabilities				(42,395)
Other liabilities				(755)
Net assets acquired				$ 163,028
Telecity Group plc [Member]
Business Acquisition [Line Items]
Cash and cash equivalents					$ 73,368
Accounts receivable					24,042
Other current assets					41,079
Assets held for sale					877,650
Property, plant and equipment					1,058,583
Goodwill					2,215,567
Intangible assets					694,243
Deferred tax assets					994
Other assets					4,102
Total assets acquired					4,989,628
Accounts payable and accrued liabilities					(84,367)
Accrued property, plant and equipment					(3,634)
Other current liabilities					(27,233)
Liabilities held for sale					(155,650)
Capital lease and other financing obligations					(165,365)
Mortgage and loans payable					(592,304)
Deferred tax liabilities					(176,168)
Other liabilities					(40,021)
Net assets acquired					$ 3,744,886