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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Directors And Key Management Remuneration [Abstract] |  |  |
Emoluments | $ 9,069 | $ 8,339 | $ 9,186
Long term incentive plans | 2,923 | 4,685 | 3,071
Total | 11,992 | 13,024 | 12,257
Pension contributions: defined contribution plans | 80 | $ 135 | $ 69
Gains made on exercise of share options | $ 107 |  |

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