Debt - Additional Information (Detail) (USD $)	6 Months Ended				1 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended			6 Months Ended				6 Months Ended
	Jun. 30, 2014 lb	Jun. 30, 2013 lb	Feb. 15, 2013	Jun. 22, 2012	Oct. 25, 2013 Minimum	Jun. 30, 2014 Minimum	Oct. 25, 2013 Maximum	Jun. 30, 2014 Maximum	Feb. 15, 2013 Term Loan	Jun. 22, 2012 Term Loan	Jun. 30, 2014 Term Loan Base Rate	Jun. 30, 2014 Term Loan Eurodollar	Feb. 15, 2013 Revolving Credit Facility	Jun. 22, 2012 Revolving Credit Facility	Jun. 30, 2014 Revolving Credit Facility Base Rate	Jun. 30, 2014 Revolving Credit Facility Eurodollar
Debt Disclosure [Line Items]
Maximum borrowing under PNC facility			$ 40,000,000	$ 27,000,000					$ 4,000,000	$ 4,000,000			$ 36,000,000	$ 23,000,000
Fees and expenses relating to creation of PNC facility	125,000
Available borrowing under PNC facility	24,000,000
PNC Facility effective rate of interest	3.00%
Interest rate description under PNC facility	Interest charges with respect to loans are computed on the actual principal amount of loans outstanding during the month at a rate per annum equal to (A) with respect to domestic rate loans, the sum of (i) a rate per annum equal to the higher of (1) the base commercial lending rate of PNC, (2) the federal funds open rate plus .5% and (3) the daily LIBOR plus 1%, plus (ii) .5% and (B) with respect to Eurodollar rate loans, the sum of the Eurodollar rate plus 2.75%.
Fixed charge coverage ratio					1.00	1.00	1.10	1.10
Debt instrument, description of variable rate basis											Base Rate plus one percent	Eurodollar Rate plus two and three quarters of one percent			Base Rate plus one percent	Eurodollar Rate plus two and three quarters of one percent
Earnings Before Interest Taxes Depreciation And Amortization	$ 1,535,000
Production and importation permission from government agency	30,000,000	63,000,000