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Average number of employees - Summary of average number of employees (Parenthetical) (Detail) - Employee | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of average number of employees [Line Items] |  |  |
Average number of employees | 46,807 | 51,029 | 54,938
Singapore [member] |  |  |
Disclosure of average number of employees [Line Items] |  |  |
Average number of employees | 434 | 262 |
India [member] |  |  |
Disclosure of average number of employees [Line Items] |  |  |
Average number of employees | 310 | 280 |

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- Definition The average number of personnel employed by the entity during a period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_112_c&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition Disclosure of average number of employees.. + References No definition available. + Details
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- Details
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- Details
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