Goodwill and other intangible assets	6 Months Ended
Goodwill and other intangible assets	Jun. 30, 2011
Goodwill and other intangible assets [Abstract]
Goodwill and Intangible Assets Disclosure	Goodwill and other intangible assets As required under ASC Topic 350, the Company performs an annual assessment of its goodwill and other intangible assets to determine if the carrying value exceeds the fair value. Additionally, the guidance requires an immediate impairment assessment if a change in circumstances can materially negatively affect the fair value of the intangible assets. During the second quarter of 2010, the Company assessed its intangible assets at Ameristar East Chicago for impairment due to the significant reduction in the property’s actual operating results and forecasted future results following the closure of a bridge near the property in November 2009. As a result, during the second quarter of 2010, the Company recorded a total of $56.0 million in non-cash impairment charges relating to the goodwill and gaming license acquired in the purchase of the East Chicago property. The impairment charges reduced the carrying value of goodwill by $21.4 million and the gaming license by $34.6 million. For the three and six months ended June 30, 2011, there were no impairment charges relating to goodwill and indefinite-lived intangible assets. The Company will perform its annual review of goodwill and indefinite-lived intangible assets in the fourth quarter of 2011. The Company utilized Level 2 inputs as described in “Note 8 — Fair value measurements” to determine fair value relating to goodwill and intangible assets.

The entire disclosure for 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 (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.

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