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Employee benefit plans - Summary of Movement in the Fair Value of Plan Assets of the Year (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Plan assets    
Disclosure of fair value of plan assets [line items]    
Beginning Balance $ 48,059 $ 56,304
Interest income on plan assets 1,881 1,799
Actuarial gain (loss) 1,517 (2,500)
Benefit payments (2,341) (3,227)
Exchange gain (loss) 1,882 (4,317)
Ending Balance 26,568 48,059
Present value of defined benefit obligation    
Disclosure of fair value of plan assets [line items]    
Beginning Balance 53,314 59,984
Interest income on plan assets 2,116 2,004
Actuarial gain (loss) 7,878 (1,303)
Assets distributed on settlement (24,430) 0
Benefit payments (3,765) (3,895)
Exchange gain (loss) (985) 6,826
Ending Balance 38,548 53,314
Employee benefit plans | Plan assets    
Disclosure of fair value of plan assets [line items]    
Beginning Balance 1,864 2,429
Interest income on plan assets 72 73
Actuarial gain (loss) 82 (64)
Benefit payments (152) (399)
Exchange gain (loss) 92 (175)
Ending Balance 1,958 1,864
Employee benefit plans | Present value of defined benefit obligation    
Disclosure of fair value of plan assets [line items]    
Beginning Balance 16,239 16,028
Interest income on plan assets 669 601
Actuarial gain (loss) 3,097 1,209
Assets distributed on settlement 0 0
Benefit payments (1,576) (1,066)
Exchange gain (loss) 428 3,468
Ending Balance 20,182 16,239
SERP | Plan assets    
Disclosure of fair value of plan assets [line items]    
Beginning Balance 46,195 53,875
Interest income on plan assets 1,809 1,726
Actuarial gain (loss) 1,435 (2,436)
Benefit payments (2,189) (2,828)
Exchange gain (loss) 1,790 (4,142)
Ending Balance 24,610 46,195
SERP | Present value of defined benefit obligation    
Disclosure of fair value of plan assets [line items]    
Beginning Balance 37,075 43,956
Interest income on plan assets 1,447 1,403
Actuarial gain (loss) 4,781 (2,512)
Assets distributed on settlement (24,430) 0
Benefit payments (2,189) (2,829)
Exchange gain (loss) (1,413) 3,358
Ending Balance $ 18,366 $ 37,075