Debt (Detail)	9 Months Ended		9 Months Ended		9 Months Ended									9 Months Ended		0 Months Ended
	Sep. 30, 2014 USD ($) quarter	Dec. 31, 2013 USD ($)	Sep. 30, 2014 Domestic Line of Credit [Member] USD ($)	Dec. 31, 2013 Domestic Line of Credit [Member] USD ($)	Sep. 30, 2014 China Facility [Member] USD ($)	Sep. 30, 2013 China Facility [Member] USD ($)	Jun. 27, 2014 China Facility [Member] USD ($)	Jun. 27, 2014 China Facility [Member] CNY	Dec. 31, 2013 China Facility [Member] USD ($)	Sep. 30, 2014 Standby Letters of Credit [Member] USD ($)	Dec. 31, 2013 Standby Letters of Credit [Member] USD ($)	Sep. 30, 2013 Amount Available for Increase Upon Approval of Lender [Member] USD ($)	Sep. 30, 2013 Amended Amount [Member] USD ($)	Sep. 30, 2014 Minimum [Member]	Sep. 30, 2014 Maximum [Member]	Jun. 27, 2014 People's Bank of China Base Rate [Member] China Facility [Member]
Line of credit, maximum borrowing capacity							$ 5,686,000	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			1,624,000				1,636,000
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	50,000,000
Letters of credit, amount outstanding			8,262,000	3,478,000	0				0	427,000	646,000
Line of Credit Facility, Interest Rate at Period End (as a percent)					7.00%				7.00%
Line of credit, remaining borrowing capacity			6,738,000	11,522,000						3,635,000	3,443,000
Line of credit, commitment fee percentage			0.25%
Interest Paid					$ 96,000	$ 29,000