Earnings (Loss) per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Basic:
Net income (loss) attributable to Ranger Energy Services, Inc.	$ (3.2)	$ (0.5)	$ (6.6)	$ 2.5
Diluted:
Net income (loss) attributable to Ranger Energy Services, Inc.	(3.2)	(0.5)	(6.6)	2.5
Effect of noncontrolling interest, net of tax	$ 2.5	$ 0.4	$ 5.2	$ (2.0)
Weighted average shares (denominator):
Weighted average number of shares - basic (in shares)	8,506,781	8,769,389	8,532,788	8,591,128
Effect of share-based awards (in shares)	0	0	0	0
Effect of noncontrolling interest, net of tax (in shares)	0	0	0	6,866,154
Weighted average number of shares - diluted (in shares)	8,506,781	8,769,389	8,532,788	15,457,282
Basic income (loss) per share (in dollars per share)	$ (0.38)	$ (0.06)	$ (0.77)	$ 0.29
Diluted income (loss) per share (in dollars per share)	$ (0.38)	$ (0.06)	$ (0.77)	$ 0.25
Equity-Based awards
Weighted average shares (denominator):
Antidilutive securities (in shares)	1,300,000	900,000	1,300,000	900,000
Convertible Common Stock
Weighted average shares (denominator):
Antidilutive securities (in shares)	6,900,000	6,900,000	6,900,000
Class A Common Stock
Basic:
Net income (loss) attributable to Ranger Energy Services, Inc.	$ (3.2)	$ (0.5)	$ (6.6)	$ 2.5
Diluted:
Net income (loss) attributable to Ranger Energy Services, Inc.	(3.2)	(0.5)	(6.6)	2.5
Effect of noncontrolling interest, net of tax	0.0	0.0	0.0	1.3
Net income (loss) attributable to Class A Common Stock	$ (3.2)	$ (0.5)	$ (6.6)	$ 3.8