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Principles and Accounting Methods - Additional Information (Details)
12 Months Ended
Nov. 09, 2016
Dec. 31, 2016
Minimum    
Property, Plant and Equipment [Line Items]    
Intangible asset, useful life (in years)   1 year
Ratio of value of instrument to hedged item   0.8
Maximum    
Property, Plant and Equipment [Line Items]    
Intangible asset, useful life (in years)   5 years
Ratio of value of instrument to hedged item   1.25
Fixtures and Fittings | Minimum    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, useful life (in years)   5 years
Fixtures and Fittings | Maximum    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, useful life (in years)   10 years
Furniture and Equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, useful life (in years)   1 year
Furniture and Equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, useful life (in years)   5 years
Software | Minimum    
Property, Plant and Equipment [Line Items]    
Weighted average useful life (in years) 1 year  
Intangible asset, useful life (in years)   3 years
Software | Maximum    
Property, Plant and Equipment [Line Items]    
Weighted average useful life (in years) 3 years  
Intangible asset, useful life (in years)   5 years