Equity (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended		12 Months Ended	50 Months Ended
	Mar. 12, 2021	Mar. 09, 2021	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Mar. 31, 2022
Equity
Effect of CW Unit redemptions			$ 0	$ 0
TRA Liability Increase				46,700
Tax benefit for partial valuation allowance				$ 5,100
Cash dividend declared (in dollars per share)			$ 0.11	$ 0.09
Pro rata distributions made to other members			$ 1,654	$ 1,674
Additional Paid-In Capital
Equity
Effect of CW Unit redemptions			7,878	44,999
Non-controlling Interest
Equity
Effect of CW Unit redemptions			$ (7,888)	(45,062)
Cactus LLC
Equity
Ownership interest			79.30%		78.00%
Cactus Inc
Equity
Cash distributions to unit holders			$ 6,300	4,200
CW Unit Holders other than Cactus, Inc.
Equity
Pro rata distributions made to other members			$ 1,700	$ 1,700
March 2021 Secondary Offering | Additional Paid-In Capital
Equity
Effect of CW Unit redemptions	$ 45,000
March 2021 Secondary Offering | Non-controlling Interest
Equity
Effect of CW Unit redemptions	(45,000)
March 2021 Secondary Offering | Other Nonoperating Income (Expense)
Equity
Offering expenses	$ 400
Class A Common Stock
Equity
Common stock, shares outstanding (in shares)			60,197,000		59,035,000	60,197,000
Shares outstanding, percentage of total voting power			79.30%			79.30%
Cash dividend declared (in dollars per share)			$ 0.11	$ 0.09
Dividends declared			$ 6,600	$ 4,400
Dividends paid			$ 6,700	$ 4,500
Class A Common Stock | Cactus Wellhead LLC Agreement
Equity
CW Unit redemptions (in shares)			1,000,000			44,900,000
Class A Common Stock | March 2021 Secondary Offering
Equity
CW Unit redemptions (in shares)	6,272,500
Shares sold (in shares)		6,325,000
Price of stock (in dollars per share)		$ 30.555
Other shares sold (in shares)	52,500
Class B Common Stock
Equity
Common stock, shares outstanding (in shares)			15,674,000		16,674,000	15,674,000
Shares outstanding, percentage of total voting power			20.70%			20.70%