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Income from operations - Employees per geographical location (Detail) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Number of employees [Line items] |  |  |
Average number of employees | 115,392 | 113,572 | 114,211
Continuing operations [Member] |  |  |
Number of employees [Line items] |  |  |
Average number of employees | 71,895 | 69,602 | 65,882
Discontinued operations [Member] |  |  |
Number of employees [Line items] |  |  |
Average number of employees | 43,497 | 43,971 | 48,330
Country of domicile [Member] | Continuing operations [Member] |  |  |
Number of employees [Line items] |  |  |
Average number of employees | 11,308 | 11,199 | 7,589
Foreign countries [Member] | Continuing operations [Member] |  |  |
Number of employees [Line items] |  |  |
Average number of employees | 60,587 | 58,403 | 58,292

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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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