Retirement Plans - Net Periodic Pension (Benefit) Cost (Details) - USD ($) $ in Thousands	8 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Actuarial gains		$ (4,396)	$ 0	$ 0
Ntelos Holding, Corp [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0
Interest cost	956
Expected return on plan assets	(1,018)
Actuarial gains	(4,286)
Net periodic (benefit) cost	(4,348)
Ntelos Holding, Corp [Member] | Other Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	18
Interest cost	108
Expected return on plan assets	0
Actuarial gains	(174)
Net periodic (benefit) cost	$ (48)