Business Combinations - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Aug. 31, 2016	May 02, 2016
Business Acquisition [Line Items]
Goodwill	$ 263,459
Tower Cloud
Business Acquisition [Line Items]
Property, plant and equipment		$ 163,680
Cash and cash equivalents		14,346
Accounts receivable		3,043
Other assets		2,595
Intangible assets		116,218
Accounts payable, accrued expenses and other liabilities		(16,782)
Deferred revenue		(23,900)
Deferred income taxes		(24,840)
Capital lease obligations		(6,750)
Net assets acquired		227,610
Goodwill		$ 117,254
PEG Bandwidth, LLC
Business Acquisition [Line Items]
Property, plant and equipment			$ 293,415
Cash and cash equivalents			7,003
Accounts receivable			6,230
Other assets			5,161
Intangible assets			38,000
Accounts payable, accrued expenses and other liabilities			(9,075)
Deferred revenue			(12,700)
Capital lease obligations			(49,195)
Net assets acquired			278,839
Goodwill			$ 146,205