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Directors' and key management remuneration - Summary of aggregate remuneration calculated in accordance with UK companies act 2006 (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure Of Directors And Key Management Remuneration [Abstract] |  |  |
Emoluments | $ 8,339 | $ 9,186 | $ 10,590
Long-term incentive plans | 4,685 | 3,071 | 2,118
Total | 13,024 | 12,257 | 12,708
Pension contributions: defined contribution plans | $ 135 | $ 69 | 52
Gains made on exercise of share options |  |  | $ 1

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