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Intangible Assets - Summary (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Cost    
Total cost $ 151,506 $ 155,103
Foreign exchange movement (5,085) (2,389)
Accumulated amortization (100,249) (84,898)
Foreign exchange movement 2,798 1,423
Net book value 54,055 71,628
Customer relationships acquired    
Cost    
Total cost 109,622 91,230
Technology asset acquired    
Cost    
Total cost 11,169 11,169
Order backlog    
Cost    
Total cost 31,220 18,208
Trade names/ brands acquired    
Cost    
Total cost 2,766 2,766
Volunteer list acquired    
Cost    
Total cost 1,325 1,325
Non-compete arrangements    
Cost    
Total cost 489 489
Mapi intangible asset    
Cost    
Total cost $ 0 $ 32,305