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Organization and Nature of Operations - Other IPO related items (Details) - USD ($) $ in Thousands				12 Months Ended
	Jul. 16, 2018	Feb. 12, 2018	Jan. 25, 2018	Dec. 31, 2018	Dec. 31, 2016
Reorganization and Other IPO related items
Write-off of unamortized debt discount and deferred loan costs				$ 4,305	$ (2,251)
Deferred tax asset, net				159,053
Liability related to tax receivable agreement, net of current portion				$ 138,015
Tax savings payable to TRA Holders (as a percent)	85.00%	85.00%		85.00%
Tax savings benefit recorded as APIC (as a percent)	15.00%	15.00%		15.00%
Retained earnings				$ 51,683
Non-controlling interest		$ 130,900
Member distributions prior to IPO				26,000	2,055
Term loan facility
Reorganization and Other IPO related items
Write-off of unamortized debt discount and deferred loan costs		4,300
Cactus LLC
Reorganization and Other IPO related items
Retained earnings		$ 0
Member distributions prior to IPO			$ 26,000
Members' Equity (Deficit)
Reorganization and Other IPO related items
Member distributions prior to IPO				$ 26,000	$ 2,055
Restricted Stock Units
Reorganization and Other IPO related items
Restricted stock unit awards issued (in shares)		737,493
IPO
Reorganization and Other IPO related items
Write off of stock issuance costs against equity		$ 2,200