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

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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_DebtInstrumentAxis=cwh_NewSeniorSecuredCreditFacilityTermLoanFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- 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_SeniorSecuredCreditFacilityTermLoanFacilityMember
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_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						1 Months Ended	3 Months Ended	6 Months Ended	12 Months Ended
	Mar. 28, 2018	Oct. 06, 2017	Mar. 17, 2017	Nov. 08, 2016	Sep. 21, 2016	Jun. 30, 2015	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2015	Dec. 31, 2014	Nov. 20, 2013
Term Loan Facility
Long-Term Debt
Unamortized discount							$ 6.0		$ 5.4
Secured Debt \| Line of Credit \| Prior Senior Secured Credit Facility, Term Loan Facility
Long-Term Debt
Maximum borrowing capacity					$ 828.2							$ 525.0
Maximum borrowing capacity, increase in capacity					$ 135.0	$ 95.0				$ 55.0	$ 117.0
Unamortized discount												$ 5.3
Secured Debt \| Line of Credit \| 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 \| 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 \| Term Loan Facility
Long-Term Debt
Term				5 years
Secured Debt \| Revolving Credit Facility \| Revolving Credit Facility
Long-Term Debt
Maximum borrowing capacity				$ 35.0