Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended								12 Months Ended
	Oct. 29, 2019	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Total revenues		$ 140,238	$ 160,808	$ 168,493	$ 158,875	$ 139,824	$ 150,658	$ 138,543	$ 115,110	$ 628,414	$ 544,135	$ 341,191
Income from operations		36,085	47,123	51,450	48,492	43,864	52,133	46,487	35,217	183,150	177,701	88,863
Net income		31,274	35,833	40,750	48,446	38,683	43,648	41,542	26,408	156,303	150,281	66,547
Less: pre-IPO net income attributable to Cactus LLC									13,648		13,648	$ 66,547
Less: net income attributable to non-controlling interest		13,216	16,494	19,342	21,639	21,759	24,976	29,208	9,007	70,691	84,950
Net income attributable to Cactus, Inc. - basic		$ 18,058	$ 19,339	$ 21,408	$ 26,807	$ 16,924	$ 18,672	$ 12,334	$ 3,753	$ 85,612	$ 51,683
Earnings per Class A share - basic						$ 0.45	$ 0.52	$ 0.47	$ 0.14		$ 1.60
Earnings per Class A Share - diluted (1) (2)		$ 0.38	$ 0.41	$ 0.45	$ 0.59	$ 0.44	$ 0.52	$ 0.46	$ 0.14	$ 1.88	1.58
Dividends declared per common share										0.09
Class A Common Stock
Earnings per Class A share - basic		0.38	$ 0.41	$ 0.46	$ 0.69					1.90	1.60
Earnings per Class A Share - diluted (1) (2)										1.88	$ 1.58
Dividends declared per common share	$ 0.09	$ 0.09								$ 0.09