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Property and equipment - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Property, Plant and Equipment [Line Items]          
Depreciation expense $ 7.4 $ 4.7 $ 16.2 $ 12.9  
Minimum [Member]          
Property, Plant and Equipment [Line Items]          
Useful lives of gaming equipment and other equipment     3 years    
Maximum [Member]          
Property, Plant and Equipment [Line Items]          
Useful lives of gaming equipment and other equipment     6 years    
Gaming equipment [Member]          
Property, Plant and Equipment [Line Items]          
Property, Plant and Equipment, Gross, Reclassification Amount         $ 2.8
Gaming equipment [Member] | Minimum [Member]          
Property, Plant and Equipment [Line Items]          
Useful lives of gaming equipment and other equipment     3 years    
Gaming equipment [Member] | Maximum [Member]          
Property, Plant and Equipment [Line Items]          
Useful lives of gaming equipment and other equipment     6 years