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Share-based payments - Summary of Movements in Awards Outstanding Under the Schemes (Detail) award in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) award | Dec. 31, 2018 USD ($) award | Dec. 31, 2017 USD ($) award
Annual Performance Plan [member] |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |
Beginning balance | 591 | 616 | 685
Granted | 217 | 176 | 235
Vested | (276) | (199) | (263)
Share capital consolidation | (21) |  | (21)
Lapsed or cancelled | (15) | (2) | (20)
Ending balance | 496 | 591 | 616
Fair value of awards granted during the year | $ | $ 58.887 | $ 60.6621 | $ 49.593
Weighted average remaining contract life (years) | 1 year 1 month 6 days | 1 year | 1 year 2 months 12 days
LTIP Performance-related awards [member] |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |
Beginning balance | 1,088 | 2,393 | 4,201
Granted | 287 | 257 | 280
Vested | (293) | (702) | (928)
Lapsed or cancelled | (387) | (860) | (1,160)
Ending balance | 695 | 1,088 | 2,393
Fair value of awards granted during the year | $ | $ 49.856 | $ 47.4867 | $ 41.332
Weighted average remaining contract life (years) | 1 year 3 months 18 days | 9 months 18 days | 7 months 6 days
LTIP Restricted stock units [member] |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |
Beginning balance | 1,301 | 916 | 449
Granted | 540 | 527 | 525
Vested | (422) |  |
Lapsed or cancelled | (144) | (142) | (58)
Ending balance | 1,275 | 1,301 | 916
Fair value of awards granted during the year | $ | $ 58.621 | $ 59.6597 | $ 52.510
Weighted average remaining contract life (years) | 1 year 2 months 12 days | 1 year 2 months 12 days | 1 year 8 months 12 days

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