Shareholders' (Deficit) Equity (Details) $ / shares in Units, $ in Millions		3 Months Ended			9 Months Ended	12 Months Ended
	Dec. 16, 2014 USD ($) shares	Sep. 30, 2015 USD ($) $ / shares shares	Jun. 30, 2015 shares	Mar. 31, 2015 shares	Sep. 30, 2015 USD ($) $ / shares shares	Dec. 31, 2014 $ / shares shares	Dec. 31, 2013 $ / item
Unit Price | $ / item							1,000
Common stock, shares issued		200,548,103			200,548,103	200,975,778
Preferred stock, shares issued		2,508,945			2,508,945	2,508,945
Awarded (in shares)				700,000		16,900,000
Common stock, shares authorized		650,000,000			650,000,000	650,000,000
Common stock, par value (in dollars per share) | $ / shares		$ 0.10			$ 0.10	$ 0.10
Common stock, shares outstanding		200,548,103			200,548,103	200,975,778
Preferred stock, shares authorized		10,000,000			10,000,000	10,000,000
Preferred stock, par value (in dollars per share) | $ / shares		$ 0.01			$ 0.01	$ 0.01
Preferred stock, shares outstanding		2,508,945			2,508,945	2,508,945
Stock-based compensation costs expensed | $		$ 0.3			$ 1.1
Restricted Stock
Awarded (in shares)		0	0		719,132
Incentive Units
Incentive Units grant date fair value to be expensed | $	$ 2.1
Stock-based compensation costs expensed | $		$ 0.1			$ 0.3
Preferred Stock
Convertible into common share	100
Legacy Sabine Investors
Common stock, shares issued	79,200,000
Preferred stock, shares issued	2,500,000
Threshold percentage of voting power to be held after conversion for conversion of preferred stock into common shares	50.00%
Threshold percentage of voting power to be held by third party after conversion for conversion of preferred stock into common shares	50.00%
Legacy Sabine Investors | Preferred Stock
Preferred stock, shares issued	2,500,000
Sabine (Forest Oil) shareholders | Common Stock
Common stock, shares issued	118,900,000
Forest Oil Combination | Legacy Sabine Investors
Economic interest (as a percent)	73.50%
Voting power (as a percent)	40.00%
Forest Oil Combination | Sabine (Forest Oil) shareholders
Economic interest (as a percent)	26.50%
Voting power (as a percent)	60.00%