Related Party Transactions - Stockholders' Agreement (Details) - Stockholders' Agreement	9 Months Ended
	Sep. 30, 2017 director
CSL
Related Party Transactions
Threshold for the number of board of directors which will determine in if the nomination rights will be proportionately increased or decreased	8
CSL | Scenario One
Related Party Transactions
Number of board of directors allowed determined by the beneficial ownership interest in Ranger's common stock	3
CSL | Scenario One | Minimum
Related Party Transactions
Percentage of beneficial ownership interest in Ranger's common stock used to determine the number of board of directors	50.00%
CSL | Scenarior Two
Related Party Transactions
Number of board of directors allowed determined by the beneficial ownership interest in Ranger's common stock	3
CSL | Scenarior Two | Minimum
Related Party Transactions
Percentage of beneficial ownership interest in Ranger's common stock used to determine the number of board of directors	30.00%
CSL | Scenarior Two | Maximum
Related Party Transactions
Percentage of beneficial ownership interest in Ranger's common stock used to determine the number of board of directors	50.00%
CSL | Scenario Three
Related Party Transactions
Number of board of directors allowed determined by the beneficial ownership interest in Ranger's common stock	2
CSL | Scenario Three | Minimum
Related Party Transactions
Percentage of beneficial ownership interest in Ranger's common stock used to determine the number of board of directors	20.00%
CSL | Scenario Three | Maximum
Related Party Transactions
Percentage of beneficial ownership interest in Ranger's common stock used to determine the number of board of directors	30.00%
CSL | Scenario Four
Related Party Transactions
Number of board of directors allowed determined by the beneficial ownership interest in Ranger's common stock	1
CSL | Scenario Four | Minimum
Related Party Transactions
Percentage of beneficial ownership interest in Ranger's common stock used to determine the number of board of directors	10.00%
CSL | Scenario Four | Maximum
Related Party Transactions
Percentage of beneficial ownership interest in Ranger's common stock used to determine the number of board of directors	20.00%
CSL | Scenario Five
Related Party Transactions
Number of board of directors allowed determined by the beneficial ownership interest in Ranger's common stock	0
CSL | Scenario Five | Maximum
Related Party Transactions
Percentage of beneficial ownership interest in Ranger's common stock used to determine the number of board of directors	10.00%
Bayou Holdings | Scenario One
Related Party Transactions
Number of board of directors allowed determined by the beneficial ownership interest in Ranger's common stock	2