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Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Assets:    
Commodity derivative assets – current $ 0 $ 97,956,000
Liabilities:    
Derivative liabilities, current 12,932,000 0
Derivative liabilities, noncurrent 14,437,000 0
Fair Value, Measurements, Recurring    
Assets:    
Assets of SERP   4,123
Liabilities:    
Deferred compensation – SERP obligation   4,125,000
Fair Value, Measurements, Recurring | Level 1    
Assets:    
Assets of SERP   4,123
Liabilities:    
Deferred compensation – SERP obligation   (4,125,000)
Fair Value, Measurements, Recurring | Level 2    
Assets:    
Assets of SERP   0
Liabilities:    
Deferred compensation – SERP obligation   0
Fair Value, Measurements, Recurring | Level 3    
Assets:    
Assets of SERP   0
Liabilities:    
Deferred compensation – SERP obligation   0
Fair Value, Measurements, Recurring | Commodity contracts    
Assets:    
Commodity derivative assets – current   97,956,000
Liabilities:    
Derivative liabilities, current (12,932,000)  
Derivative liabilities, noncurrent (14,437,000)  
Fair Value, Measurements, Recurring | Commodity contracts | Level 1    
Assets:    
Commodity derivative assets – current   0
Liabilities:    
Derivative liabilities, current 0  
Derivative liabilities, noncurrent 0  
Fair Value, Measurements, Recurring | Commodity contracts | Level 2    
Assets:    
Commodity derivative assets – current   97,956,000
Liabilities:    
Derivative liabilities, current (12,932,000)  
Derivative liabilities, noncurrent (14,437,000)  
Fair Value, Measurements, Recurring | Commodity contracts | Level 3    
Assets:    
Commodity derivative assets – current   $ 0
Liabilities:    
Derivative liabilities, current 0  
Derivative liabilities, noncurrent $ 0