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Income Taxes - Summary of Open Tax Positions (Details)
 12 Months Ended
Dec. 31, 2013
Minimum [Member] | United States Federal [Member]
  
Income Tax Contingency [Line Items]  
Open Tax Years by Major Tax Jurisdiction 2010
Minimum [Member] | United States State [Member]
  
Income Tax Contingency [Line Items]  
Open Tax Years by Major Tax Jurisdiction 2007
Minimum [Member] | Germany [Member]
  
Income Tax Contingency [Line Items]  
Open Tax Years by Major Tax Jurisdiction 2010 [1]
Minimum [Member] | Hong Kong [Member]
  
Income Tax Contingency [Line Items]  
Open Tax Years by Major Tax Jurisdiction 2006
Minimum [Member] | Italy [Member]
  
Income Tax Contingency [Line Items]  
Open Tax Years by Major Tax Jurisdiction 2008 [1]
Minimum [Member] | Sweden [Member]
  
Income Tax Contingency [Line Items]  
Open Tax Years by Major Tax Jurisdiction 2007
Minimum [Member] | United Kingdom [Member]
  
Income Tax Contingency [Line Items]  
Open Tax Years by Major Tax Jurisdiction 2011
Maximum [Member] | United States Federal [Member]
  
Income Tax Contingency [Line Items]  
Open Tax Years by Major Tax Jurisdiction 2013
Maximum [Member] | United States State [Member]
  
Income Tax Contingency [Line Items]  
Open Tax Years by Major Tax Jurisdiction 2013
Maximum [Member] | Germany [Member]
  
Income Tax Contingency [Line Items]  
Open Tax Years by Major Tax Jurisdiction 2013 [1]
Maximum [Member] | Hong Kong [Member]
  
Income Tax Contingency [Line Items]  
Open Tax Years by Major Tax Jurisdiction 2013
Maximum [Member] | Italy [Member]
  
Income Tax Contingency [Line Items]  
Open Tax Years by Major Tax Jurisdiction 2013 [1]
Maximum [Member] | Sweden [Member]
  
Income Tax Contingency [Line Items]  
Open Tax Years by Major Tax Jurisdiction 2013
Maximum [Member] | United Kingdom [Member]
  
Income Tax Contingency [Line Items]  
Open Tax Years by Major Tax Jurisdiction 2013
[1] Includes federal as well as local jurisdictions.