Acquisitions - General Information (Details) - Assets Or Stock Of Multiple Dealership Locations Acquired - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Acquisitions
Real properties purchased	$ 6.0	$ 9.5
Real properties sold in sale-leaseback transactions		$ 1.2

Real properties sold in sale-leaseback transactions during the period.

No definition available.

Name:	cwh_SaleLeasebackTransactionRealPropertiesSold
Namespace Prefix:	cwh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration