Increase in the maximum borrowing capacity under the credit facility.

No definition available.

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

- Definition

The percentage of mandatory amortization of new credit facility, per annum in equal quarterly installments.

+ References

No definition available.

+ Details

Name:	cwh_LineOfCreditFacilityPercentageOfAmortizationOfEqualQuarterlyInstallments
Namespace Prefix:	cwh_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Description of the frequency of periodic payments (monthly, quarterly, annual).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

+ Details

Name:	us-gaap_DebtInstrumentFrequencyOfPeriodicPayment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of the required periodic payments including both interest and principal payments.

+ References

+ Details

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

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after accumulated amortization, of debt discount.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentUnamortizedDiscount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=cwh_NewSeniorSecuredCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=cwh_NewSeniorSecuredCreditFacilityTermLoanFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=cwh_NewSeniorSecuredCreditFacilityRevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Long-Term Debt - Borrowings (Details) - USD ($) $ in Millions					3 Months Ended	6 Months Ended	9 Months Ended
	Mar. 28, 2018	Oct. 06, 2017	Mar. 17, 2017	Nov. 08, 2016	Dec. 31, 2017	Sep. 30, 2017	Sep. 30, 2018
Long-Term Debt
Debt Instrument, Unamortized Discount					$ 6.0		$ 5.6
Secured Debt \| Line of Credit \| Existing Senior Secured Credit Facility
Long-Term Debt
Maximum borrowing capacity			$ 740.0	$ 680.0
Maximum borrowing capacity, increase in capacity			$ 95.0
Mandatory amortization of new credit facility (as a percent)				1.00%
Secured Debt \| Line of Credit \| Existing Senior Secured Credit Facility, Term Loan Facility
Long-Term Debt
Maximum borrowing capacity	$ 1,190.0	$ 939.5		$ 645.0
Term				7 years
Maximum borrowing capacity, increase in capacity	$ 250.0	205.0
Mandatory amortization of new credit facility (as a percent)	1.01%
Principal payment frequency				quarterly
Quarterly amortization payment	$ 3.0	$ 2.4
Secured Debt \| Revolving Credit Facility
Long-Term Debt
Quarterly amortization payment					$ 2.4	$ 1.9	$ 3.0
Secured Debt \| Revolving Credit Facility \| Existing Senior Secured Credit Facility, Term Loan Facility
Long-Term Debt
Term				5 years
Secured Debt \| Revolving Credit Facility \| Existing Senior Secured Credit Facility, Revolving Credit Facility
Long-Term Debt
Maximum borrowing capacity				$ 35.0