Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

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+ Details

Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended	3 Months Ended
	Sep. 30, 2012	Sep. 30, 2012	Sep. 30, 2012 Gaming rights [Member]	Sep. 30, 2012 Trademark [Member]	Jun. 30, 2012 Trademark [Member]
Intangible Assets Excluding Goodwill [Line Items]
Impairment of intangible assets excluding goodwill			$ 32.0	$ 127.0	$ 33.0
Impairment of intangible assets	406.0
Impairment of goodwill	247.0	247.0
Thistledown		$ 20.1