Acquisitions - General Information (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018
Acquisitions
Real properties purchased	$ 27.8	$ 100.1
Real properties purchased from parties related to the sellers of the dealership businesses	$ 2.9	$ 23.6

Real properties acquired from parties related to the sellers of businesses acquired, during the period.

No definition available.

Name:	cwh_RealpropertiesacquiredRelatedToSellersOfDealershipBusinesses
Namespace Prefix:	cwh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration