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Equity - Redemptions and Dividends (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions					1 Months Ended	3 Months Ended	12 Months Ended
	Dec. 19, 2019	Oct. 29, 2019	Mar. 21, 2019	Mar. 20, 2019	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Redemptions of CW Units
CW Unit redemptions							(804)	(7)
Dividends declared per common share							$ 0.09
Cactus LLC
Redemptions of CW Units
Increase to equity in non-controlling interest							$ 48.7
March 2019 Secondary Offering
Redemptions of CW Units
CW Unit redemptions				8,500	(8,474)
March 2019 Secondary Offering | Other income (expense)
Redemptions of CW Units
Offering expenses					$ 1.0
Class A Common Stock
Redemptions of CW Units
Dividends declared per common share		$ 0.09				$ 0.09	$ 0.09
Dividend paid	$ 4.2
Class A Common Stock | March 2019 Secondary Offering
Redemptions of CW Units
Number of shares issued			8,500				800
Number of shares sold by certain other selling stockholders				26
Class B Common Stock
Redemptions of CW Units
Number of shares canceled							800

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