Business Combinations, Asset Acquisitions and Dispositions - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Sep. 18, 2020	Aug. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Oct. 19, 2018
Fair values of the assets acquired and liabilities assumed as of the acquisition date:
Goodwill			$ 601,878	$ 690,672	$ 692,385
Windstream
Consideration:
Asset Purchase Agreement	$ 284,550
Fair value of settlement obligation	438,577
Total consideration	723,127
Fair values of the assets acquired and liabilities assumed as of the acquisition date:
Property, plant and equipment	170,754
Intangible assets, net	69,832
Other assets	27,632
Intangible liabilities	(195,091)
Total assets acquired, net	73,127
Settlement expense	650,000
Total consideration	$ 723,127
Bluebird Fiber Network
Consideration:
Total consideration		$ 320,800
Fair values of the assets acquired and liabilities assumed as of the acquisition date:
Property, plant and equipment		139,566
Intangible assets, net		175,401
Other assets		8,946
Accounts payable, accrued expenses and other liabilities		(3,095)
Total assets acquired, net		320,818
Total consideration		$ 320,800
Information Transport Solutions, Inc.
Fair values of the assets acquired and liabilities assumed as of the acquisition date:
Property, plant and equipment						$ 4,270
Cash and cash equivalents						5,931
Intangible assets, net						30,254
Accounts receivable						3,909
Other assets						7,238
Goodwill						9,941
Accounts payable, accrued expenses and other liabilities						(2,645)
Deferred revenue						(567)
Total assets acquired, net						$ 58,331