Summary of significant accounting policies Property, plant and equipment (Details)	12 Months Ended
	Dec. 31, 2013
Buildings
Property, Plant and Equipment [Line Items]
Residual value, percentage	10.00%
River cruise ship and canal boats
Property, Plant and Equipment [Line Items]
Useful life	25 years
Maximum | Buildings
Property, Plant and Equipment [Line Items]
Useful life	60 years
Maximum | Trains
Property, Plant and Equipment [Line Items]
Useful life	75 years
Maximum | Furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Useful life	25 years
Minimum | Furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Useful life	5 years