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Income Taxes - Open Tax Years by Major Jurisdiction (Detail)
 12 Months Ended
Dec. 31, 2012
Germany [Member]
  
Open Tax Years By Major Jurisdiction [Line Items]  
Open tax years by major jurisdiction 2006
Italy [Member]
  
Open Tax Years By Major Jurisdiction [Line Items]  
Open tax years by major jurisdiction 2007
Japan [Member]
  
Open Tax Years By Major Jurisdiction [Line Items]  
Open tax years by major jurisdiction 2010
Korea [Member]
  
Open Tax Years By Major Jurisdiction [Line Items]  
Open tax years by major jurisdiction 2008
United States [Member]
  
Open Tax Years By Major Jurisdiction [Line Items]  
Open tax years by major jurisdiction 2009