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Defined Benefit Plans - Summary of Movement in the Defined Benefit Obligation Over the Year (Detail) - Present value of defined benefit obligation [member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of net defined benefit liability (asset) [line items]    
Beginning Balance $ 50,622 $ 40,253
Current service cost 2,979 2,003
Past service cost 414 3,687
Interest cost 2,128 1,816
Actuarial loss (gain) 2,682 2,384
Benefit payments (2,545) (471)
Exchange (gain) loss 3,704 950
Ending Balance 59,984 50,622
Defined Benefit Pension Plans [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Beginning Balance 12,936 8,688
Current service cost 2,102 520
Past service cost 206 3,494
Interest cost 620 476
Actuarial loss (gain) 292 445
Benefit payments (1,060) (26)
Exchange (gain) loss 932 (661)
Ending Balance 16,028 12,936
Supplemental pension plan [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Beginning Balance 37,686 31,565
Current service cost 877 1,483
Past service cost 208 193
Interest cost 1,508 1,340
Actuarial loss (gain) 2,390 1,939
Benefit payments (1,485) (445)
Exchange (gain) loss 2,772 1,611
Ending Balance $ 43,956 $ 37,686