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Long-Term Bank Debt - Additional Information (Detail) (USD $)
 3 Months Ended 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Minimum [Member]
Mar. 31, 2014
Maximum [Member]
Mar. 31, 2014
Equipment Loan [Member]
Jul. 31, 2013
Equipment Loan [Member]
Mar. 31, 2014
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            
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 March 31, 2014) 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 (2.50% to 3.00% at March 31, 2014). At March 31, 2014, the Company had in place one base rate loan and one LIBO rate loan with effective rates of 5.00% and 2.91%, 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 2.91%            
Outstanding borrowings under revolving credit facility 108,500,000            
Weighted-average interest rate of borrowings 3.51%            
Credit facility remaining borrowing capacity 31,500,000            
Debt instrument basis weighted average interest rate spread on variable rate 3.55% 3.57%          
Equipment Loan, face amount           10,000,000  
Equipment Loan, monthly payment         184,000    
Equipment Loan, maturity date         Jul. 31, 2018    
Company's bank debt         8,900,000   75,000,000
Interest swap agreements period             2 years
Commenced date             Jan. 31, 2014
Settlement of interest rate swaps             $ 54,000