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Income Taxes - Open Tax Years for Each Major Jurisdiction (Detail)
 9 Months Ended
Sep. 30, 2013
United States [Member]
  
Income Tax Contingency [Line Items]  
Open tax years beginning 2002
Open tax years ending 2012
Canada [Member]
  
Income Tax Contingency [Line Items]  
Open tax years beginning 2004
Open tax years ending 2012
United Kingdom [Member]
  
Income Tax Contingency [Line Items]  
Open tax years beginning 2004
Open tax years ending 2012
Netherlands [Member]
  
Income Tax Contingency [Line Items]  
Open tax years beginning 2007
Open tax years ending 2012