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Commissions and Expenses - Summary of Cumulative Number of Shares and Their Status in Relation to Active Long Term Incentive Plans and Allocated Variable Compensation to Identified Staff (Detail) | 12 Months Ended
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Dec. 31, 2019 shares € / shares | Dec. 31, 2018 shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Beginning balance | 22,548,724 | 18,585,551
Number of shares conditionally granted |  |
Number of shares allocated |  |
Number of shares conditionally granted | 7,378,113 | 6,513,984
Number of shares allocated | 621,373 | 916,988
Number of shares forfeited | (549,647) | (636,527)
Number of shares vested | (5,797,262) | (2,831,272)
Ending balance | 24,201,301 | 22,548,724
2015 [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Beginning balance | 2,380,167 | 4,314,494
Number of shares conditionally granted | 5,178,633 |
Number of shares allocated | 4,942,275 |
Number of shares forfeited | (3,912) | (102,383)
Number of shares vested | (2,376,255) | (1,831,944)
Ending balance |  | 2,380,167
Average share price used for grant in EUR | € / shares | € 6.106 |
2015 [member] | Bottom of range [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Fair value of shares at grant date in EUR | € / shares | 5.159 |
2015 [member] | Top of range [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Fair value of shares at grant date in EUR | € / shares | € 6.018 |
2016 [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Beginning balance | 6,243,971 | 6,591,429
Number of shares conditionally granted | 6,809,814 |
Number of shares allocated | 7,155,420 |
Number of shares allocated | 22,580 | 11,471
Number of shares forfeited | (44,746) | (169,629)
Number of shares vested | (2,530,968) | (189,300)
Ending balance | 3,690,837 | 6,243,971
Average share price used for grant in EUR | € / shares | € 5.128 |
2016 [member] | Bottom of range [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Fair value of shares at grant date in EUR | € / shares | 3.990 |
2016 [member] | Top of range [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Fair value of shares at grant date in EUR | € / shares | € 4.898 |
2017 [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Beginning balance | 7,244,231 | 7,679,628
Number of shares conditionally granted | 6,722,418 |
Number of shares allocated | 7,461,564 |
Number of shares allocated | 30,730 | 739,146
Number of shares forfeited | (331,606) | (364,515)
Number of shares vested | (426,360) | (810,028)
Ending balance | 6,516,995 | 7,244,231
Average share price used for grant in EUR | € / shares | € 5.246 |
2017 [member] | Bottom of range [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Fair value of shares at grant date in EUR | € / shares | 4.040 |
2017 [member] | Top of range [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Fair value of shares at grant date in EUR | € / shares | € 4.933 |
2018 [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Beginning balance | 6,680,355 |
Number of shares conditionally granted | 6,513,984 |
Number of shares allocated | 6,123,546 |
Number of shares conditionally granted |  | 6,513,984
Number of shares allocated | 390,438 | 166,371
Number of shares forfeited | (169,383) |
Number of shares vested | (457,079) |
Ending balance | 5,663,455 | 6,680,355
Average share price used for grant in EUR | € / shares | € 5.405 |
2018 [member] | Bottom of range [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Fair value of shares at grant date in EUR | € / shares | 4.143 |
2018 [member] | Top of range [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Fair value of shares at grant date in EUR | € / shares | € 5.054 |
2019 [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of shares conditionally granted | 7,378,113 |
Number of shares conditionally granted | 7,378,113 |
Number of shares allocated | 958,501 |
Number of shares vested | (6,600) |
Ending balance | 8,330,014 |
Average share price used for grant in EUR | € / shares |  |
2019 [member] | Bottom of range [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Fair value of shares at grant date in EUR | € / shares | 2.741 |
2019 [member] | Top of range [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Fair value of shares at grant date in EUR | € / shares | € 3.737 |

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