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Assets Held for Sale - Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]      
Impairment of Oil and Gas Properties $ 46,109,000 $ 47,238,000 $ 1,168,000
Oil and gas properties 120,926,000    
Less: accumulated depreciation, depletion, amortization and impairment 94,198,000    
Total assets 26,728,000 0  
Asset retirement obligation (10,228,000)    
Total liabilities (10,228,000)    
Net assets $ 16,500,000    
Proved oil and gas properties      
Property, Plant and Equipment [Line Items]      
Impairment of Oil and Gas Properties   $ 40,000,000 $ 0