Acquisitions - Preliminary Purchase Price Allocation (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Jan. 15, 2016	Dec. 31, 2015	Nov. 02, 2015
Business Acquisition [Line Items]
Goodwill	$ 3,336,968		$ 1,063,200
Telecity Group plc [Member]
Business Acquisition [Line Items]
Cash and cash equivalents		$ 73,368
Accounts receivable		20,022
Other current assets		39,929
Property, plant and equipment		1,249,374
Goodwill		2,745,913
Intangible assets		861,817
Deferred tax assets		568
Other assets		4,123
Total assets acquired		4,995,114
Accounts payable and accrued expenses		(163,490)
Accrued property, plant and equipment		(3,634)
Capital lease and other financing obligations		(263,894)
Mortgage and loans payable		(592,304)
Other current liabilities		(33,730)
Deferred tax liabilities		(156,667)
Other liabilities		(36,509)
Net assets acquired		$ 3,744,886
Bit-isle [Member]
Business Acquisition [Line Items]
Cash and cash equivalents				$ 33,198
Accounts receivable				7,359
Other current assets				51,038
Long-term investments				3,806
Property, plant and equipment				308,985
Goodwill				95,444
Intangible assets				111,374
Other assets				22,981
Total assets acquired				634,185
Accounts payable and accrued expenses				(15,028)
Accrued property, plant and equipment				(465)
Capital lease and other financing obligations				(108,833)
Mortgage and loans payable				(190,227)
Other current liabilities				(8,689)
Deferred tax liabilities				(32,192)
Other liabilities				(3,384)
Net assets acquired				$ 275,367