Subsequent Events - Additional Information (Detail) (USD $)	12 Months Ended	3 Months Ended
	Dec. 31, 2012	Mar. 31, 2013 Subsequent Event [Member]
Subsequent Event [Line Items]
Initiation date of manufacturing work stoppage	Mar. 07, 2013
End date of manufacturing work stoppage	Mar. 20, 2013
Adverse impact of work stoppage on revenues		$ 1,300,000
Incremental costs incurred related to work stoppage		$ 700,000