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Supplemental Information on Oil and Natural Gas Producing Activities - Standardized Measure of Discounted Future Net Cash Flows (Unaudited) (Additional Information) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]        
Standardized measure of discounted future net cash flows $ 1,314,562 $ 4,087,752 $ 4,017,611 $ 5,840,368
Non-controlling Interest        
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]        
Standardized measure of discounted future net cash flows $ 224,600 $ 643,300 $ 781,600