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Long-Term Debt - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Minimum [Member]
Dec. 31, 2013
Maximum [Member]
Dec. 31, 2013
Equipment Loan [Member]
Jul. 31, 2013
Equipment Loan [Member]
Dec. 31, 2013
Interest Rate Swap [Member]
Debt Instrument [Line Items]              
Credit facility borrowing capacity $ 250,000,000            
Maturity date of amended and restated credit agreement Jul. 30, 2017            
Maximum percentage of production 90.00%            
Restrictions on the payment of dividends, distributions or purchase of treasury stock 5,000,000            
Credit facility borrowing base 140,000,000            
Credit facility, interest rate description The Company's borrowing rates in the credit facility provide for base rate loans at the prime rate (3.25% at December 31, 2013) plus applicable margin utilization rates that range from 1.50% to 2.00%, and LIBO rate loans at LIBO published rates plus applicable utilization rates that range from 2.50% to 3.00%. At December 31, 2013, the Company had in place one base rate loan and one LIBO rate loan with effective rates of 5.00% and 2.92%, respectively.            
Percentage for base rate loans at the prime rate 3.25%       3.95%   0.563%
Minimum range for applicable margin utilization rate 1.50%            
Maximum range for applicable margin utilization rate 2.00%            
Debt instrument interest one base rate basis for effective rate 5.00%            
LIBOR rate loans     2.50% 3.00%      
Effective LIBOR loan rate 2.92%            
Outstanding borrowings under revolving credit facility 112,500,000            
Weighted-average interest rate of borrowings 3.06%            
Credit facility remaining borrowing capacity 27,500,000            
Debt instrument basis weighted average interest rate spread on variable rate 3.58% 3.81%          
Interest swap agreements period 2 years            
Company's bank debt         9,400,000   75,000,000
Equipment Loan, face amount           10,000,000  
Equipment Loan, monthly payment         $ 184,000    
Equipment Loan, maturity date         Jul. 31, 2018