Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2017
Basic
Net loss attributable to Ranger Energy Services, Inc.	$ (3.1)	$ (3.5)	$ (6.6)
Diluted
Net loss attributable to Ranger Energy Services, Inc.	$ (3.1)	$ (3.5)	$ (6.6)
Weighted average shares (denominator):
Weighted average number of shares - basic			8,413,178
Weighted average number of shares - diluted			8,413,178
Basic net loss per share (in dollars per share)	$ (0.36)	$ (0.42)	$ (0.78)
Diluted net loss per share (in dollars per share)	$ (0.36)	$ (0.42)	$ (0.78)
Class A Common Stock
Basic
Net loss attributable to Ranger Energy Services, Inc.			$ (6.6)
Diluted
Net loss attributable to Ranger Energy Services, Inc.			$ (6.6)
Class B Common Stock
Weighted average shares (denominator):
Antidilutive Securities			6,900,000
Restricted shares
Weighted average shares (denominator):
Antidilutive Securities			20,000