Leases (Details)	9 Months Ended
Sep. 30, 2019
Lessee, Lease, Description [Line Items]
Operating lease option to terminate	true
Finance lease option to terminate	true
Minimum
Lessee, Lease, Description [Line Items]
Length of potential lease renewal for operating leases	1 year
Length of potential lease renewal for finance leases	1 year
Maximum
Lessee, Lease, Description [Line Items]
Length of potential lease renewal for operating leases	10 years
Length of potential lease renewal for finance leases	10 years

Indicates (true false) whether lessee has option to terminate finance lease.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

+ Details

Name:	us-gaap_LesseeFinanceLeaseExistenceOfOptionToTerminate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:booleanItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Definition

Indicates (true false) whether lessee has option to terminate operating lease.

+ References

+ Details

Name:	us-gaap_LesseeOperatingLeaseExistenceOfOptionToTerminate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:booleanItemType
Balance Type:	na
Period Type:	duration

- Definition

Potential extension of original lease term under renewal terms.

+ References

No definition available.

+ Details

Name:	whd_LesseeFinanceLeaseTermOfContractPotentialExtensionPeriod
Namespace Prefix:	whd_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Potential extension of original lease term under renewal terms.

+ References

No definition available.

+ Details

Name:	whd_LesseeOperatingLeaseTermOfContractPotentialExtensionPeriod
Namespace Prefix:	whd_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: