Revenue from Contracts with Customers - Narrative (Details) - USD ($) $ in Millions	4 Months Ended	9 Months Ended
	Apr. 30, 2019	Sep. 30, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Management fee, percentage		8.00%
Service fee retained by Sprint		8.60%
Management fee on prepaid wireless revenues and costs		6.00%
Revenue	$ 1.5
Capitalized contract costs, average customer life (in months)		44 months
Cable
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Installation revenue, recognition period		10 months
Commissions and other costs, recognition period (in months)		44 months
Wireline
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Installation revenue, recognition period		11 months
Commissions and other costs, recognition period (in months)		72 months
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reimbursement payment, cost of equipment and commissions, benefit period for recognition		21 months
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reimbursement payment, cost of equipment and commissions, benefit period for recognition		53 months