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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure Of Directors And Key Management Remuneration [Abstract] |  |  |
Emoluments | $ 7,524 | $ 9,069 | $ 8,339
Long-term incentive plans | 4,748 | 2,923 | 4,685
Total | 12,272 | 11,992 | 13,024
Pension contributions: defined contribution plans | 42 | 80 | 135
Gains made on exercise of share options | $ 0 | $ 107 | $ 0

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