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Income Tax - Additional Information (Detail) - Dec. 31, 2015
€ in Millions, $ in Millions
USD ($)
EUR (€)
United Kingdom [Member]    
Components Of Income Tax Expense Benefit [Line Items]    
Taxation loss carryforwards $ 12.7  
Spain [Member]    
Components Of Income Tax Expense Benefit [Line Items]    
Taxation loss carryforwards 119.8 € 110.3
Disallowed costs carried forward 37.2 34.2
Spain [Member] | Spanish Tax Authorities [Member]    
Components Of Income Tax Expense Benefit [Line Items]    
Taxation loss carryforwards 31.5 29.0
Luxembourg [Member]    
Components Of Income Tax Expense Benefit [Line Items]    
Taxation loss carryforwards $ 131.3 € 120.9