Calder Racing Operations (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015
Calder Racing [Abstract]
Restructuring and Related Cost, Accelerated Depreciation	$ 2.4
Demolition Expense	$ 0.8chdn_DemolitionExpense

Amount of accelerated depreciation charged against earnings associated with exit from or disposal of business activities or restructuring plan.

No definition available.

Name:	us-gaap_RestructuringReserveAcceleratedDepreciation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration