Segment Reporting - Additional Information (Detail) (Advanced Technology, USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Advanced Technology
Segment Reporting Information [Line Items]
Reimbursed research and development costs	$ 612	$ 665	$ 1,222	$ 1,107