Discontinued Operations - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2009
Discontinued Operations And Disposal Groups [Abstract]
Gain from discontinued operations, net of tax	$ 0	$ 0	$ 0	$ 153,000	$ 187,000
Negotiated consideration for 3D product line sales			2,700,000
Negotiated consideration for the sales of discontinued operation in the form of cash			320,000
Negotiated consideration for the sales of discontinued operation in the form of notes receivable			$ 2,400,000