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Long-Term Debt and Financing Arrangements - Additional Information (Detail) (USD $)
 6 Months Ended 6 Months Ended
Jun. 30, 2013
Equipment Note [Member]
Jun. 30, 2013
Standby Letters of Credit [Member]
Jun. 30, 2013
Standby Letters of Credit [Member]
Minimum [Member]
Jun. 30, 2013
Standby Letters of Credit [Member]
Maximum [Member]
Jun. 30, 2013
Revolving Line of Credit Facility [Member]
Dec. 31, 2012
Revolving Line of Credit Facility [Member]
Schedule Of Debt [Line Items]            
Notes, expiration, start date May 14, 2018          
Notes, expiration, end date Jun. 19, 2018          
Notes, fixed interest rate, minimum 1.90%          
Notes, fixed interest rate, maximum 2.00%          
Notes, quarterly principle and interest payments $ 480,000          
Outstanding letters of credit   4,200,000        
Unused and available borrowings under bank revolving line of credit         $ 45,800,000 $ 46,300,000
Letters of credit expiration, year     2013 2014