Preparation of Interim Financial Statements and Other Items - Ownership interest (Details)	Jul. 16, 2018	Jun. 30, 2018
Other Ownership Interests [Line Items]
Non-controlling interest owned (as a percentage)	49.70%	64.70%
Cactus LLC
Other Ownership Interests [Line Items]
Ownership interest (as a percent)	50.30%	35.30%

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.

No definition available.

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