Debt (Detail)	9 Months Ended		9 Months Ended		9 Months Ended
	Sep. 30, 2013 USD ($) quarter	Dec. 31, 2012 USD ($)	Sep. 30, 2013 Domestic Line of Credit [Member] USD ($)	Dec. 31, 2012 Domestic Line of Credit [Member] USD ($)	Sep. 30, 2013 China Facility [Member] USD ($)	Sep. 30, 2012 China Facility [Member] USD ($)	Jun. 28, 2013 China Facility [Member] USD ($)	Jun. 28, 2013 China Facility [Member] CNY	Dec. 31, 2012 China Facility [Member] USD ($)	Sep. 30, 2013 Standby Letters of Credit [Member] USD ($)	Dec. 31, 2012 Standby Letters of Credit [Member] USD ($)	Jun. 30, 2011 Amount Available for Increase Upon Approval of Lender [Member] USD ($)	Jun. 30, 2011 Amended Amount [Member] USD ($)	Jun. 30, 2011 Minimum [Member]	Jun. 30, 2011 Maximum [Member]	Jun. 28, 2013 People's Bank of China Base Rate [Member] China Facility [Member]
Line of credit, maximum borrowing capacity							$ 5,690,000	35,000,000				$ 25,000,000	$ 15,000,000
Basis spread on variable rate (as percent)														2.50%	3.75%	125.00%
Line of credit, amount outstanding	0	0			1,626,000				0
Maximum funded deb to EBITA ratio , debt	2.0
Maximum funded to debt to EBITDA ratio, EBITDA	1.0
Number of Quarters (in quarters)	4
Annual capital expenditure limit	10,000,000
Minimum tangible net worth	55,000,000
Percentage of net income	50.00%
Percentage of capital issuances	100.00%
Letters of credit, amount outstanding			6,871,000	7,432,000	0				0	762,000	1,112,000
Line of Credit Facility, Interest Rate at Period End (as a percent)					7.00%				7.00%
Line of credit, remaining borrowing capacity			8,129,000	7,568,000						3,302,000	4,429,000
Line of credit, commitment fee percentage			0.25%
Interest Paid					$ 29,000	$ 74,000