Goodwill and Other Intangible Assets	6 Months Ended
Goodwill and Other Intangible Assets	Jun. 30, 2011
Goodwill and Other Intangible Assets [Abstract]
GOODWILL AND OTHER INTANGIBLE ASSETS	11. GOODWILL AND OTHER INTANGIBLE ASSETS In accordance with ASC 350 — Intangibles — Goodwill and Other (“ASC 350”) (formerly SFAS No. 142, “Goodwill and Other Intangible Assets”), the amortization of goodwill and indefinite-lived intangible assets is prohibited and requires such assets to be tested annually for impairment, or more frequently if impairment indicators arise. We have determined that our cable franchise rights and goodwill are indefinite-lived assets and therefore not amortizable. We directly assess the value of cable franchise rights for impairment under ASC 350 by utilizing a discounted cash flow methodology. In performing an impairment test in accordance with ASC 350, we make assumptions, such as future cash flow expectations, customer growth, competition, industry outlook, capital expenditures, and other future benefits related to cable franchise rights, which are consistent with the expectations of buyers and sellers of cable systems in determining fair value. If the determined fair value of our cable franchise rights is less than the carrying amount on the financial statements, an impairment charge would be recognized for the difference between the fair value and the carrying value of such assets. Goodwill impairment is determined using a two-step process. The first step compares the fair value of a reporting unit with our carrying amount, including goodwill. If the fair value of a reporting unit exceeds our carrying amount, goodwill of the reporting unit is considered not impaired and the second step is unnecessary. If the carrying amount of a reporting unit exceeds our fair value, the second step is performed to measure the amount of impairment loss, if any. The second step compares the implied fair value of the reporting unit’s goodwill, calculated using the residual method, with the carrying amount of that goodwill. If the carrying amount of the goodwill exceeds the implied fair value, the excess is recognized as an impairment loss. We have determined that we have one reporting unit for the purpose of applying ASC 350, Mediacom Broadband. Our most recently completed annual impairment test was conducted as of October 1, 2010, and we will be conducting our next annual impairment test as of October 1, 2011. In accordance with ASU 2010-28, we have evaluated the qualitative factors surrounding our Mediacom Broadband reporting unit with its negative equity carrying value. We do not believe that it is “more likely than not” that a goodwill impairment exists. As such, we have not performed Step 2 of the goodwill impairment test. The economic conditions currently affecting the U.S. economy and the long-term impact on the fundamentals of our business may have a negative impact on the fair values of the assets in our reporting units. This may result in the recognition of an impairment loss in the future. Because we believe there has not been a meaningful change in the long-term fundamentals of our business during the first six months of 2011, we have determined that there has been no triggering event under ASC 350, and as such, no interim impairment test was required as of June 30, 2011.

Discloses the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain or loss on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss. This element may be used as a single block of text to include the entire intangible asset disclosure including data and tables.

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