Property, Plant and Equipment - Schedule of Carrying Value of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 9,350,464	$ 9,250,151
Less accumulated depreciation	(5,803,963)	(5,741,212)
Net property, plant and equipment	3,546,501	3,508,939
Land
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	28,683	28,449
Building and Improvements
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 360,572	359,980
Building and Improvements | Minimum
Property Plant And Equipment [Line Items]
Depreciable Lives	3 years
Building and Improvements | Maximum
Property Plant And Equipment [Line Items]
Depreciable Lives	40 years
Poles
Property Plant And Equipment [Line Items]
Depreciable Lives	30 years
Property, plant and equipment, gross	$ 285,474	281,130
Fiber
Property Plant And Equipment [Line Items]
Depreciable Lives	30 years
Property, plant and equipment, gross	$ 4,164,962	4,107,519
Equipment
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 348,114	331,761
Equipment | Minimum
Property Plant And Equipment [Line Items]
Depreciable Lives	5 years
Equipment | Maximum
Property Plant And Equipment [Line Items]
Depreciable Lives	7 years
Copper
Property Plant And Equipment [Line Items]
Depreciable Lives	20 years
Property, plant and equipment, gross	$ 3,933,940	3,918,281
Conduit
Property Plant And Equipment [Line Items]
Depreciable Lives	30 years
Property, plant and equipment, gross	$ 89,859	89,859
Tower assets
Property Plant And Equipment [Line Items]
Depreciable Lives	20 years
Property, plant and equipment, gross	$ 8,544	8,544
Finance Lease Assets
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	72,284	72,284
Other assets
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 10,578	10,652
Other assets | Minimum
Property Plant And Equipment [Line Items]
Depreciable Lives	15 years
Other assets | Maximum
Property Plant And Equipment [Line Items]
Depreciable Lives	20 years
Corporate assets
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 14,581	14,326
Corporate assets | Minimum
Property Plant And Equipment [Line Items]
Depreciable Lives	3 years
Corporate assets | Maximum
Property Plant And Equipment [Line Items]
Depreciable Lives	7 years
Construction in progress
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 32,873	$ 27,366