Credit Agreement - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended
	Mar. 31, 2011	Dec. 31, 2012	Mar. 02, 2011
Line of Credit Facility [Line Items]
Company can borrow principally secured loans by its accounts receivable, inventories and equipment			$ 25.0
Line of credit facility expiration date	Mar. 02, 2014
Credit agreement date	Mar. 02, 2011
Additional borrowings available		25.0
Line of Credit | Minimum
Line of Credit Facility [Line Items]
Credit Agreement is a LIBOR based rate with a margin spread			2.50%
Line of Credit | Maximum
Line of Credit Facility [Line Items]
Credit Agreement is a LIBOR based rate with a margin spread			3.50%
Standby Letters of Credit
Line of Credit Facility [Line Items]
Credit Agreement, standby letters of credit outstanding in the amount		$ 0