Share-based compensation - Options on EUR-denominated listed share (Detail) - EUR [Member]	12 Months Ended
Dec. 31, 2017 EUR (€)
Share-based compensation [Line items]
Outstanding at end of year	2,772,210
Option plans [Member]
Share-based compensation [Line items]
Outstanding at beginning of year	7,052,065
Weighted average exercise price beginning of year	€ 22.49
Number of share options exercised in share-based payment arrangement	2,591,755
Weighted average exercise price of share options exercised in share-based payment arrangement	€ 20.42
Number of share options forfeited in share-based payment arrangement	60,027
Weighted average exercise price of share options forfeited in share-based payment arrangement	€ 20.55
Number of share options expired in share-based payment arrangement	1,628,073
Weighted average exercise price of share options expired in share-based payment arrangement	€ 30.96
Outstanding at end of year	2,772,210
Weighted average exercise price end of year	€ 19.49
Number of share options exercisable in share-based payment arrangement	2,772,210
Weighted average exercise price of share options in share-based payment arrangement exercised during period at date of exercise	€ 19.49

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

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-Name IFRS
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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The number of share options exercisable in a share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The number of share options exercised in a share-based payment arrangement.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The number of share options expired in a share-based payment arrangement.

+ References

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

+ References

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- Definition

The weighted average exercise price of share options exercised in a share-based payment arrangement. [Refer: Weighted average [member]]

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The weighted average exercise price of share options expired in a share-based payment arrangement. [Refer: Weighted average [member]]

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The weighted average exercise price of share options forfeited in a share-based payment arrangement. [Refer: Weighted average [member]]

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- Definition

The weighted average share price at the date of exercise for share options that are exercised in a share-based payment arrangement. [Refer: Share-based payment arrangements [member]; Weighted average [member]]

+ References

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- Definition

The weighted average exercise price of share options outstanding in a share-based payment arrangement. [Refer: Weighted average [member]]

+ References

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- References

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