XML 81 R62.htm IDEA: XBRL DOCUMENT v3.3.1.900
Income Taxes - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Current federal income tax benefit $ (44,096,000) $ 159,000 $ (10,904,000)
Deferred (272,311,000) (102,177,000) 79,629,000
Current income tax receivable 46,174,000 7,212,000  
Operating loss carryforwards $ 97,225,000    
Operating loss carryforwards begins to expire 2035    
Statutory depletion deductions available for tax reporting purposes $ 1,056,000    
Valuation allowance against portion of deferred tax assets 180,121,000 0  
Income taxes allocated to other comprehensive income related to oil and gas hedges (35,737,000) 49,601,000 $ (17,003,000)
Unrecognized tax benefits 491,000 0  
Unrecognized tax benefits, interest expense 131,000 0  
Unrecognized tax benefits, penalties expense $ 0 $ 0