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Intangible Assets - Summary of Reconciliation of Changes in Intangible Assets and Goodwill (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance $ 69,502 $ 69,426  
Impairment loss   5,900  
Ending balance 81,115 69,502 $ 69,426
Gross carrying amount [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 110,607 101,870 82,517
Additions 18,681 14,474 19,418
Disposals (4,891) (1,546) (65)
Impairment loss   (5,931)  
Reclassifications 1,557 1,740  
Ending balance 125,954 110,607 101,870
Amortization of intangible assets [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance (41,105) (32,444) (25,222)
Amortization for the year (8,628) (10,207) (7,287)
Disposals 4,894 1,546 65
Ending balance (44,839) (41,105) (32,444)
Goodwill [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 20,380 20,380  
Ending balance 20,380 20,380 20,380
Goodwill [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 20,380 20,380 20,380
Ending balance 20,380 20,380 20,380
License and software rights [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 33,044 31,365  
Ending balance 29,844 33,044 31,365
License and software rights [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 74,149 63,809 37,663
Additions 1,783 73 121
Disposals (4,891) (1,546) (65)
Reclassifications 3,642 11,813 26,090
Ending balance 74,683 74,149 63,809
License and software rights [member] | Amortization of intangible assets [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance (41,105) (32,444) (25,222)
Amortization for the year (8,628) (10,207) (7,287)
Disposals 4,894 1,546 65
Ending balance (44,839) (41,105) (32,444)
Intangible in process [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 16,078 17,681  
Ending balance 30,891 16,078 17,681
Intangible in process [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 16,078 17,681 24,474
Additions 16,898 14,401 19,297
Impairment loss   (5,931)  
Reclassifications (2,085) (10,073) (26,090)
Ending balance $ 30,891 $ 16,078 $ 17,681