Income Taxes - Provision for Income Taxes from Continuing Operations (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current:
Federal	$ 2,544,000	$ 2,307,000	$ (2,317,000)
Foreign	719,000	897,000	3,343,000
State	(116,000)	202,000	1,306,000
Deferred:
Federal	577,000	1,824,000	4,058,000
Foreign	89,000	203,000	(2,031,000)
State	(148,000)	149,000	(1,338,000)
Income tax provision from continuing operations	$ 3,665,000	$ 5,582,000	$ 3,021,000