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Related Party Transactions - Common Shares Held by Supervisory Board members (Detail) - shares | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of key management personnel compensation [line items] |  |
Common shares held by Supervisory Board members | 38,210 | 48,210
Robert W Dineen [member] |  |
Disclosure of key management personnel compensation [line items] |  |
Common shares held by Supervisory Board members |  | 10,000
Ben J. Noteboom [member] |  |
Disclosure of key management personnel compensation [line items] |  |
Common shares held by Supervisory Board members | 23,500 | 23,500
Ben Van Der Veer [member] |  |
Disclosure of key management personnel compensation [line items] |  |
Common shares held by Supervisory Board members | 1,450 | 1,450
Dona D Young [member] |  |
Disclosure of key management personnel compensation [line items] |  |
Common shares held by Supervisory Board members | 13,260 | 13,260

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- Definition The number of shares in the entity held by the entity or by its subsidiaries or associates. [Refer: Associates [member]; Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 79 -Subparagraph a -Clause vi -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_79_a_vi&doctype=Standard -URIDate 2019-03-27 + Details
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