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Share-based payments - Summary of Movements in Awards Outstanding Under the Schemes (Detail) | 12 Months Ended
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Dec. 31, 2017 USD ($) award yr | Dec. 31, 2016 USD ($) award yr | Dec. 31, 2015 USD ($) award yr
Annual Performance Plan [member] |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |
Beginning balance | 685,000 | 689,000 | 768,000
Granted | 234,918 | 335,775 | 265,285
Vested | (263,000) | (229,000) | (307,000)
Share capital consolidation | (21,000) | (104,000) |
Lapsed or cancelled | (20,000) | (7,000) | (37,000)
Ending balance | 616,000 | 685,000 | 689,000
Fair value of awards granted during the year | $ | $ 49.593 | $ 36.719 | $ 38.745
Weighted average remaining contract life (years) | yr | 1.2 | 1.2 | 1.2
LTIP Performance-related awards [member] |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |
Beginning balance | 4,201,000 | 5,275,000 | 6,120,000
Granted | 280,458 | 888,518 | 1,803,308
Vested | (928,000) | (915,000) | (1,278,000)
Lapsed or cancelled | (1,160,000) | (1,048,000) | (1,370,000)
Ending balance | 2,393,000 | 4,201,000 | 5,275,000
Fair value of awards granted during the year | $ | $ 41.332 | $ 17.680 | $ 17.345
Weighted average remaining contract life (years) | yr | 0.6 | 0.9 | 1.1
LTIP Restricted stock units [member] |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |
Beginning balance | 449,000 |  |
Granted | 524,587 | 467,203 |
Lapsed or cancelled | (58,000) | (18,000) |
Ending balance | 916,000 | 449,000 |
Fair value of awards granted during the year | $ | $ 52.510 | $ 36.245 |
Weighted average remaining contract life (years) | yr | 1.7 | 2.2 |

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