Organization (Policies)	3 Months Ended
Organization (Policies)	Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Preparation of Unaudited Consolidated Financial Statements	*Basis of Preparation of Unaudited Consolidated Financial Statements* Mediacom Broadband LLC (“Mediacom Broadband,” and collectively with its subsidiaries, “we,” “our” or “us”) is a Delaware limited liability company wholly-owned by Mediacom Communications Corporation (“MCC”). MCC is involved in the acquisition and operation of cable systems serving smaller cities and towns in the United States, and its cable systems are owned and operated through our operating subsidiaries and those of Mediacom LLC, a New York limited liability company wholly-owned by MCC. As limited liability companies, we and Mediacom LLC are not subject to income taxes and, as such, are included in the consolidated federal and state income tax returns of MCC, a C corporation. Our principal operating subsidiaries conduct all of our consolidated operations and own substantially all of our consolidated assets. Our operating subsidiaries are separate and distinct legal entities and have no obligation, contingent or otherwise, to make funds available to us. We rely on our parent, MCC, for various services such as corporate and administrative support. Our financial position, results of operations and cash flows could differ from those that would have resulted had we operated autonomously or as an entity independent of MCC. See Notes 8 and 9. We have prepared these unaudited consolidated financial statements in accordance with the rules and regulations of the Securities and Exchange Commission (the “SEC”). In the opinion of management, such statements include all adjustments, consisting of normal recurring accruals and adjustments, necessary for a fair statement of our consolidated results of operations, financial position, and cash flows for the interim periods presented. The accounting policies followed during such interim periods reported are in conformity with generally accepted accounting principles in the United States of America and are consistent with those applied during annual periods. For a summary of our accounting policies and other information, refer to our Annual Report on Form 10-K for the year ended December 31, 2018. The results of operations for the interim periods are not necessarily indicative of the results that might be expected for future interim periods or for the full year ending December 31, 2019. Mediacom Broadband Corporation (“Broadband Corporation”), a Delaware corporation wholly-owned by us, co-issued, jointly and severally with us, public debt securities. Broadband Corporation has no operations, revenues or cash flows and has no assets, liabilities or stockholders’ equity on its balance sheet, other than a one-hundred dollar receivable from an affiliate and the same dollar amount of common stock. Therefore, separate financial statements have not been presented for this entity.
Reclassifications	*Reclassifications* Certain reclassifications have been made to prior year amounts to conform to the current year presentation.
Leases	We maintain leases for real estate, office buildings, fiber and office equipment. Our leases have remaining terms ranging from 1 – 20 years, some of which include options to extend the leases. We determine if an arrangement is a lease at inception. ROU assets on our Consolidated Balance Sheet represent our right to use an underlying asset for the operating lease term and lease liabilities on our Consolidated Balance Sheet represent our obligation to make lease payments arising from the operating lease. Operating lease ROU assets and liabilities are recognized at commencement date based on the present value of lease payments over the lease term. Since the implicit rate of our leases is not easily determinable, we use our incremental borrowing rate, based on the information available at commencement date, in determining the present value of lease payments. The incremental borrowing rate is determined based on the rate of interest that we would have to pay to borrow an amount equal to the lease payments on a collateralized basis over a similar term. Management uses LIBOR and risk-adjusts that rate to approximate a collateralized rate for us, which will be updated on a quarterly basis for measurement of new lease liabilities. We apply the incremental borrowing rate on a portfolio basis to all asset classes. The operating lease ROU asset also includes any lease payments made and is adjusted for lease incentives. Our lease terms may include options to extend or terminate the lease when it is reasonably certain that we will exercise that option. Lease expense for lease payments is recognized on a straight-line basis over the lease term. We account for variable lease payments, such as those amounts that are impacted by the consumer price index, as a separate component from lease expense in the subsequent period in which it applies. We account for lease and non-lease components within an operating lease arrangement as separate components.