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Segment Information - Reconciliation of Segment Operating Profit (Loss) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Operating Segments [Line Items] |  |  |
Segment operating profit/(loss) | $ 9,324 | $ 12,440 | $ 5,283
Consolidated | 9,324 | 12,440 | 5,283
Other operating income | 805 | 5,084 | 5,441
Other operating expenses | (1,445) | (909) | (3,386)
Operating profit | 8,684 | 16,615 | 7,338
Finance costs | (1,378) | (1,221) | (1,147)
Finance income | 482 | 876 | 1,045
Share of loss of associates | (3) | (3) | (710)
Impairment of investment in associates |  |  | (126)
Loss on liquidation of a subsidiary |  | (261) |
Exchange gain / (loss) | 1,741 | 2,784 | (38)
Other income | 1,817 | 214 | 267
Other expense | (11) | (336) | (94)
Profit before tax | 11,332 | 18,668 | 6,535
Operating segments [Member] |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |
Segment operating profit/(loss) | 12,467 | 15,514 | 8,137
Finance income | 770 | 957 | 1,153
Profit before tax | 11,332 | 18,668 | 6,535
Corporate expense adjustments and eliminations [Member] |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |
Segment operating profit/(loss) | (3,143) | (3,074) | (2,854)
Corporate expenses | (3,143) | (3,074) | (2,854)
Finance income | (288) | (81) | (108)
Segment Reconciling Items [Member] |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |
Other operating income | 805 | 5,084 | 5,441
Other operating expenses | (1,445) | (909) | (3,386)
Finance costs | (1,378) | (1,221) | (1,147)
Finance income | 482 | 876 | 1,045
Share of loss of associates | (3) | (3) | (710)
Impairment of investment in associates |  |  | (126)
Loss on liquidation of a subsidiary |  | (261) |
Exchange gain / (loss) | 1,741 | 2,784 | (38)
Other income | 1,817 | 214 | 267
Other expense | $ (11) | $ (336) | $ (94)

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