Restructuring - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2013	Jun. 30, 2012
Restructuring [Line Items]
Restructuring costs	$ 304,000	$ 175,000
Payment of costs incurred		85,000
Impairment of Long-Lived Assets to be Disposed of			$ 229,000	$ 0