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Share-based payments - Summary of Options Award Activity (Detail) - Stock options [member]	12 Months Ended
	Dec. 31, 2017 shares	Dec. 31, 2016 shares	Dec. 31, 2015 shares
Disclosure of terms and conditions of share-based payment arrangement [line items]
Outstanding at January 1	19,894	20,940	20,940
Exercised	(11,061)	(1,046)
Forfeited	(8,833)
Outstanding at December 31		19,894	20,940

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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The number of share options outstanding in a share-based payment arrangement.

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The number of share options exercised in a share-based payment arrangement.

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