Exit Activities - Activity and Liability Balances Related to Exit Activity (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Restructuring Reserve [Roll Forward]
Beginning Balance	$ 1,010	$ 0
Exit cost incurred during the period	766	1,083
Cash payments	(1,734)	(73)
Ending Balance	$ 42	$ 1,010