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Capital - Additional Information (Detail) |  |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 20, 2015 € / shares shares | Oct. 22, 2014 € / shares $ / shares shares | Dec. 09, 2011 | Jul. 31, 2015 EUR (€) shares | Oct. 31, 2014 EUR (€) shares | Dec. 31, 2016 EUR (€) shares | Dec. 31, 2015 EUR (€) shares | Dec. 31, 2017 EUR (€) € / shares shares | Dec. 31, 2014 shares
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |
Share Capital | € |  |  |  |  |  | € 2,465,000.00 | € 2,421,000.00 | € 2,499,082.20 |
Number of share authorised |  |  |  |  |  |  |  | 24,990,822 |
Number of share issued |  |  |  |  |  |  |  | 24,990,822 |
Par value per share | € / shares |  |  |  |  |  |  |  | € 0.10 |
Fees and commission expense related to share capital | € |  |  |  |  |  | € 0 | € 18,300,000 |  |
Number of shares issued during period shares |  |  |  |  |  | 2,606,435 | 2,336,224 | 3,309,539 |
Number of additional american depository shares issued | 1,080,000 |  |  |  |  |  |  |  |
Description of american depository shares | Each ADS represents the right to receive one-half of one ordinary share. |  |  |  |  |  |  |  |
Number of ordinary shares per american depository shares | € / shares | € 0.5 |  |  |  |  |  |  |  |
Share split ratio |  |  | 0.0667 |  |  |  |  |  |
Common Shares [member] |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |
Number of share issued |  |  |  |  |  | 24,648,828 | 24,205,129 | 24,990,822 | 19,160,661
Initial Public Offering [Member] |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |
Increase in share capital during period shares |  |  |  | 4,140,000 | 3,074,686 |  |  |  |
Increase in share capital through issuance of shares | € |  |  |  | € 414,000 | € (307,468) |  |  |  |
Increase in share capital through issuance of shares gross | € |  |  |  | 254,900,000 | 104,231,855 |  |  |  |
Increase in share capital through issuance of shares net | € |  |  |  | 236,900,000 | 93,403,561 |  |  |  |
Fees and expenses related to share capital | € |  |  |  | 18,000,000 | 10,828,294.23 |  |  |  |
Number of common shares issued |  | 2,673,641 |  |  |  |  |  |  |
Initial Public Offering [Member] | Share premium [Member] |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |
Increase in share capital through issuance of shares | € |  |  |  | € 236,900,000 | € 93,403,561 |  |  |  |
Initial Public Offering [Member] | Common Shares [member] |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |
Number of shares issued during period shares | 4,140,000 | 2,138,913 |  |  |  |  |  |  |
Initial Public Offering [Member] | American Depositary Shares [Member] |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |
Par value per share | (per share) | € 34.00 | $ 21.64 |  |  |  |  |  |  |
Number of shares issued during period shares | 8,280,000 | 4,277,826 |  |  |  |  |  |  |
Private Placements Offering [Member] |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |
Number of common shares issued |  | 534,728 |  |  |  |  |  |  |
Number of common shares issued per share | € / shares |  | $ 34 |  |  |  |  |  |  |

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