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Income Taxes - Open Tax Years for Each Major Jurisdiction (Detail)
 6 Months Ended
Jun. 30, 2014
United States [Member]
  
Income Tax Contingency [Line Items]  
Open tax years beginning 2002
Open tax years ending 2013
United Kingdom [Member]
  
Income Tax Contingency [Line Items]  
Open tax years beginning 2005
Open tax years ending 2013
Netherlands [Member]
  
Income Tax Contingency [Line Items]  
Open tax years beginning 2008
Open tax years ending 2013