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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance $ 39,637 $ 45,898  
Impairment of property, plant and equipment (223) (2,524) $ 0
Ending balance 42,326 39,637 45,898
Gross carrying amount [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 155,347 162,507  
Additions 4,933 5,083  
Disposals (5,519) (5,637)  
Transfer   (399)  
Classified as held for sales   (5,497)  
Exchange differences 15,709 (710)  
Ending balance 170,470 155,347 162,507
Accumulated depreciation [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance (115,710) (116,609)  
Depreciation charge for the year (4,937) (5,427)  
Impairment of property, plant and equipment (223) (2,524)  
Disposals 5,108 5,624  
Transfer   156  
Classified as held for sales   2,695  
Exchange differences (12,382) 375  
Ending balance (128,144) (115,710) (116,609)
Land [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 4,449 4,417  
Ending balance 6,227 4,449 4,417
Land [Member] | Gross carrying amount [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 4,449 4,417  
Additions 1,120    
Exchange differences 658 32  
Ending balance 6,227 4,449 4,417
Buildings [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 15,623 17,421  
Ending balance 15,339 15,623 17,421
Buildings [Member] | Gross carrying amount [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 44,235 47,371  
Additions 34 19  
Disposals   (116)  
Transfer   2,331  
Classified as held for sales   (4,809)  
Exchange differences 4,152 (561)  
Ending balance 48,421 44,235 47,371
Buildings [Member] | Accumulated depreciation [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance (28,612) (29,950)  
Depreciation charge for the year (1,356) (1,691)  
Disposals   116  
Transfer   156  
Classified as held for sales   2,512  
Exchange differences (3,114) 245  
Ending balance (33,082) (28,612) (29,950)
Building improvement [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 2,130 2,072  
Ending balance 2,368 2,130 2,072
Building improvement [Member] | Gross carrying amount [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 4,861 4,547  
Additions 19 71  
Disposals   (1)  
Transfer 292 709  
Classified as held for sales   (454)  
Exchange differences 450 (11)  
Ending balance 5,622 4,861 4,547
Building improvement [Member] | Accumulated depreciation [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance (2,731) (2,475)  
Depreciation charge for the year (254) (241)  
Impairment of property, plant and equipment   (107)  
Disposals   1  
Classified as held for sales   97  
Exchange differences (269) (6)  
Ending balance (3,254) (2,731) (2,475)
Machinery and equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 13,415 14,125  
Ending balance 14,474 13,415 14,125
Machinery and equipment [Member] | Gross carrying amount [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 88,897 89,608  
Additions 400 443  
Disposals (4,392) (4,854)  
Transfer 2,600 4,136  
Classified as held for sales   (221)  
Exchange differences 9,459 (215)  
Ending balance 96,964 88,897 89,608
Machinery and equipment [Member] | Accumulated depreciation [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance (75,482) (75,483)  
Depreciation charge for the year (2,513) (2,672)  
Impairment of property, plant and equipment (217) (2,351)  
Disposals 4,024 4,858  
Classified as held for sales   76  
Exchange differences (8,302) 90  
Ending balance (82,490) (75,482) (75,483)
Motor vehicle and other asset and assets under finance lease [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 1,086 1,144  
Ending balance 1,800 1,086 1,144
Motor vehicle and other asset and assets under finance lease [Member] | Gross carrying amount [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 4,608 4,642  
Additions 1,119 367  
Disposals (914) (440)  
Transfer   75  
Exchange differences 417 (36)  
Ending balance 5,230 4,608 4,642
Motor vehicle and other asset and assets under finance lease [Member] | Accumulated depreciation [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance (3,522) (3,498)  
Depreciation charge for the year (477) (455)  
Impairment of property, plant and equipment   (29)  
Disposals 877 432  
Exchange differences (308) 28  
Ending balance (3,430) (3,522) (3,498)
Office equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 864 909  
Ending balance 1,071 864 909
Office equipment [Member] | Gross carrying amount [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 6,227 6,112  
Additions 396 312  
Disposals (213) (220)  
Transfer 124 50  
Classified as held for sales   (13)  
Exchange differences 425 (14)  
Ending balance 6,959 6,227 6,112
Office equipment [Member] | Accumulated depreciation [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance (5,363) (5,203)  
Depreciation charge for the year (337) (368)  
Impairment of property, plant and equipment (6) (37)  
Disposals 207 217  
Classified as held for sales   10  
Exchange differences (389) 18  
Ending balance (5,888) (5,363) (5,203)
Construction in progress [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 2,070 5,810  
Ending balance 1,047 2,070 5,810
Construction in progress [Member] | Gross carrying amount [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Beginning balance 2,070 5,810  
Additions 1,845 3,871  
Disposals   (6)  
Transfer (3,016) (7,700)  
Exchange differences 148 95  
Ending balance $ 1,047 $ 2,070 $ 5,810