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Financial assets and liabilities - Aircraft financing (Details) - aircraft
 12 Months Ended
Nov. 30, 2016
Aug. 25, 2015
Nov. 27, 2014
Feb. 28, 2014
Aug. 01, 2013
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Aircraft financing                  
Number of aircraft incorporated to fleet           5 17 7  
Revolving line of credit                  
Aircraft financing                  
Number of aircraft financed 22 8 4 2 8 1      
Number of aircraft delivered             5   1
Number of aircraft incorporated to fleet           1      
Number of aircraft with rescheduled delivery dates 22 7