Segment Reporting - Additional Information (Detail) (Advanced Technology, USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Advanced Technology
Segment Reporting Information [Line Items]
Reimbursed research and development costs	$ 375	$ 656	$ 1,597	$ 1,763