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Staff costs and Directors' emoluments - Summary of Average Number of Employees (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, including part-time employees | 6,658 | 6,587 | 7,311
Americas [member] |  |  |
Disclosure of average number of employees [line items] |  |  |
Average number of employees, including part-time employees | 2,149 | 2,121 | 2,082
Europe [member] |  |  |
Disclosure of average number of employees [line items] |  |  |
Average number of employees, including part-time employees | 813 | 782 | 1,041
AMEA [member] |  |  |
Disclosure of average number of employees [line items] |  |  |
Average number of employees, including part-time employees | 1,454 | 1,598 | 1,658
China [member] |  |  |
Disclosure of average number of employees [line items] |  |  |
Average number of employees, including part-time employees | 294 | 299 | 865
Central [member] |  |  |
Disclosure of average number of employees [line items] |  |  |
Average number of employees, including part-time employees | 1,948 | 1,787 | 1,665

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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 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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