Income Taxes - Summary of Open Tax Positions (Details)	12 Months Ended
	Dec. 31, 2012
United States Federal [Member]
Income Tax Contingency [Line Items]
Open Tax Years by Major Tax Jurisdiction	2010 - present
United States State [Member]
Income Tax Contingency [Line Items]
Open Tax Years by Major Tax Jurisdiction	2005 - present
Germany [Member]
Income Tax Contingency [Line Items]
Open Tax Years by Major Tax Jurisdiction	2010 - present	[1]
Hong Kong [Member]
Income Tax Contingency [Line Items]
Open Tax Years by Major Tax Jurisdiction	2006 - present
Italy [Member]
Income Tax Contingency [Line Items]
Open Tax Years by Major Tax Jurisdiction	2008 - present	[1]
Sweden [Member]
Income Tax Contingency [Line Items]
Open Tax Years by Major Tax Jurisdiction	2006 - present
United Kingdom [Member]
Income Tax Contingency [Line Items]
Open Tax Years by Major Tax Jurisdiction	2010 - present

[1] Includes federal as well as local jurisdictions.