Income Taxes (Detail) - Multiple tax jurisdictions, both within and outside of the United States:	12 Months Ended
	Dec. 31, 2012
United States – Federal [Member]
Open Tax Years	2009 - 2012
United States – State [Member]
Open Tax Years	2008 - 2012
Canada [Member]
Open Tax Years	2007 - 2012
Sweden [Member]
Open Tax Years	2010 - 2012
United Kingdom [Member]
Open Tax Years	2008 - 2012