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Segment Information - Summary of Number of Employees (Detail) - Employees | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of number of employees [line items] |  |  |
Number of employees | 23,757 | 26,543 | 28,318
Americas [member] |  |  |
Disclosure of number of employees [line items] |  |  |
Number of employees | 8,570 | 8,824 | 10,951
The Netherlands [member] |  |  |
Disclosure of number of employees [line items] |  |  |
Number of employees | 3,582 | 3,548 | 3,089
United Kingdom [member] |  |  |
Disclosure of number of employees [line items] |  |  |
Number of employees | 2,261 | 3,135 | 3,435
Southern & Eastern Europe [member] |  |  |
Disclosure of number of employees [line items] |  |  |
Number of employees | 2,853 | 2,837 | 2,947
Asia [member] |  |  |
Disclosure of number of employees [line items] |  |  |
Number of employees | 4,540 | 6,344 | 6,025
Joint ventures and associates [member] |  |  |
Disclosure of number of employees [line items] |  |  |
Number of employees | 5,162 | 6,854 | 6,497
Joint ventures and associates [member] | Americas [member] |  |  |
Disclosure of number of employees [line items] |  |  |
Number of employees | 651 | 559 | 549
Joint ventures and associates [member] | United Kingdom [member] |  |  |
Disclosure of number of employees [line items] |  |  |
Number of employees | 62 | 58 |
Joint ventures and associates [member] | Southern & Eastern Europe [member] |  |  |
Disclosure of number of employees [line items] |  |  |
Number of employees | 104 | 86 | 83
Joint ventures and associates [member] | Asia [member] |  |  |
Disclosure of number of employees [line items] |  |  |
Number of employees | 4,172 | 5,983 | 5,702
Asset management [member] |  |  |
Disclosure of number of employees [line items] |  |  |
Number of employees | 1,535 | 1,464 | 1,500
Asset management [member] | Joint ventures and associates [member] |  |  |
Disclosure of number of employees [line items] |  |  |
Number of employees | 173 | 168 | 163
Holding and other activities [member] |  |  |
Disclosure of number of employees [line items] |  |  |
Number of employees | 416 | 390 | 371

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- Definition The number of personnel employed by the entity at a date. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
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