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Disclosure - Share-Based Payments - Summary of Details of Share Based Payment Arrangement Free Shares (Detail) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended
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Apr. 20, 2017 € / shares | Mar. 14, 2017 € / shares | Dec. 09, 2016 EUR (€) € / shares | Oct. 27, 2016 EUR (€) € / shares | Sep. 01, 2016 EUR (€) € / shares | Aug. 16, 2016 EUR (€) € / shares | Jun. 21, 2016 EUR (€) € / shares | Apr. 06, 2016 EUR (€) € / shares | Dec. 15, 2015 EUR (€) € / shares | Sep. 30, 2015 EUR (€) € / shares | Jun. 03, 2014 EUR (€) € / shares | Sep. 12, 2013 EUR (€) € / shares | Nov. 28, 2012 EUR (€) € / shares | Jul. 25, 2012 EUR (€) € / shares | Apr. 02, 2012 EUR (€) € / shares | Dec. 31, 2017 | Dec. 15, 2017 € / shares | Dec. 05, 2017 € / shares | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,300 | 625,200 |  |
Share entitlement per free share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 1 | € 1 |  |
Free Share [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 46,500 |  |  | 310,350 | 750,500
Date of Grant One [Member] | Free Share [Member] | Board of Director [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period (years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |
Number of options granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 669,796 |  |  |  |  |
Share entitlement per free share |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 1 |  |  |  |  |
Grant date share fair value (in euros) | € |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 8.86 |  |  |  |  |
Expected dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |
Performance conditions |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Yes |  |  |  |  |
Expected turnover during the vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |
Date of Grant Two [Member] | Free Share [Member] | Board of Director [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period (years) |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |
Number of options granted |  |  |  |  |  |  |  |  |  |  |  |  |  | 134,081 |  |  |  |  |  |
Share entitlement per free share |  |  |  |  |  |  |  |  |  |  |  |  |  | € 1 |  |  |  |  |  |
Grant date share fair value (in euros) | € |  |  |  |  |  |  |  |  |  |  |  |  |  | € 8.20 |  |  |  |  |  |
Expected dividends |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |
Performance conditions |  |  |  |  |  |  |  |  |  |  |  |  |  | Yes |  |  |  |  |  |
Expected turnover during the vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |
Date of Grant Three [Member] | Free Share [Member] | Board of Director [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period (years) |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |
Number of options granted |  |  |  |  |  |  |  |  |  |  |  |  | 35,360 |  |  |  |  |  |  |
Share entitlement per free share |  |  |  |  |  |  |  |  |  |  |  |  | € 1 |  |  |  |  |  |  |
Grant date share fair value (in euros) | € |  |  |  |  |  |  |  |  |  |  |  |  | € 8.70 |  |  |  |  |  |  |
Expected dividends |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |  |
Performance conditions |  |  |  |  |  |  |  |  |  |  |  |  | No |  |  |  |  |  |  |
Expected turnover during the vesting period |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |
Date of Grant Four [Member] | Free Share [Member] | Board of Director [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period (years) |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |
Number of options granted |  |  |  |  |  |  |  |  |  |  |  | 501,500 |  |  |  |  |  |  |  |
Share entitlement per free share |  |  |  |  |  |  |  |  |  |  |  | € 1 |  |  |  |  |  |  |  |
Grant date share fair value (in euros) | € |  |  |  |  |  |  |  |  |  |  |  | € 7.96 |  |  |  |  |  |  |  |
Expected dividends |  |  |  |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |  |  |
Performance conditions |  |  |  |  |  |  |  |  |  |  |  | Yes |  |  |  |  |  |  |  |
Expected turnover during the vesting period |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |
Date of Grant Five [Member] | Free Share [Member] | Board of Director [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period (years) |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |
Number of options granted |  |  |  |  |  |  |  |  |  |  | 186,000 |  |  |  |  |  |  |  |  |
Share entitlement per free share |  |  |  |  |  |  |  |  |  |  | € 1 |  |  |  |  |  |  |  |  |
Grant date share fair value (in euros) | € |  |  |  |  |  |  |  |  |  |  | € 19.01 |  |  |  |  |  |  |  |  |
Expected dividends |  |  |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |  |  |  |
Performance conditions |  |  |  |  |  |  |  |  |  |  | Yes |  |  |  |  |  |  |  |  |
Expected turnover during the vesting period |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |
Date of Grant 03/24/2015 [Member] | Free Share [Member] | Board of Director [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period (years) |  | 2 years |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |
Number of options granted |  |  |  |  |  |  |  |  |  | 708,500 |  |  |  |  |  |  |  |  |  |
Share entitlement per free share |  |  |  |  |  |  |  |  |  | € 1 |  |  |  |  |  |  |  |  |  |
Grant date share fair value (in euros) | € |  |  |  |  |  |  |  |  |  | € 62.99 |  |  |  |  |  |  |  |  |  |
Expected dividends |  |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |  |  |  |  |
Performance conditions |  | yes |  |  |  |  |  |  |  | Yes |  |  |  |  |  |  |  |  |  |
Expected turnover during the vesting period |  |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |  |  |  |  |
Number of free shares granted |  | 22,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share entitlement per free share |  | € 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grant date share fair value (in euros) |  | € 68.07 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected dividends |  | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected turnover during the vesting period |  | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date of Grant Seven [Member] | Free Share [Member] | Board of Director [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period (years) | 2 years |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |
Number of options granted |  |  |  |  |  |  |  |  | 42,000 |  |  |  |  |  |  |  |  |  |  |
Share entitlement per free share |  |  |  |  |  |  |  |  | € 1 |  |  |  |  |  |  |  |  |  |  |
Grant date share fair value (in euros) | € |  |  |  |  |  |  |  |  | € 64.14 |  |  |  |  |  |  |  |  |  |  |
Expected dividends |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |  |  |  |  |  |
Performance conditions | yes |  |  |  |  |  |  |  | Yes |  |  |  |  |  |  |  |  |  |  |
Expected turnover during the vesting period |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |  |  |  |  |  |
Number of free shares granted | 24,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share entitlement per free share | € 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grant date share fair value (in euros) | € 61.20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected dividends | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected turnover during the vesting period | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date of Grant Eight [Member] | Free Share [Member] | Board of Director [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period (years) |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |
Number of options granted |  |  |  |  |  |  |  | 63,750 |  |  |  |  |  |  |  |  |  |  |  |
Share entitlement per free share |  |  |  |  |  |  |  | € 1 |  |  |  |  |  |  |  |  |  |  |  |
Grant date share fair value (in euros) | € |  |  |  |  |  |  |  | € 62.40 |  |  |  |  |  |  |  |  |  |  |  |
Expected dividends |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |  |  |  |  |  |  |
Performance conditions |  |  |  |  |  |  |  | yes |  |  |  |  |  |  |  |  |  |  |  |
Expected turnover during the vesting period |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |  |  |  |  |  |  |
Date of Grant 06/21/2016 [Member] | Free Share [Member] | Board of Director [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period (years) |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options granted |  |  |  |  |  |  | 193,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Share entitlement per free share |  |  |  |  |  |  | € 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Grant date share fair value (in euros) | € |  |  |  |  |  |  | € 52.97 |  |  |  |  |  |  |  |  |  |  |  |  |
Expected dividends |  |  |  |  |  |  | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Performance conditions |  |  |  |  |  |  | yes |  |  |  |  |  |  |  |  |  |  |  |  |
Expected turnover during the vesting period |  |  |  |  |  |  | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Date of Grant 06/09/2016 [Member] | Free Share [Member] | Board of Director [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period (years) |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options granted |  |  |  |  |  | 10,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share entitlement per free share |  |  |  |  |  | € 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grant date share fair value (in euros) | € |  |  |  |  |  | € 60.68 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected dividends |  |  |  |  |  | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance conditions |  |  |  |  |  | yes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected turnover during the vesting period |  |  |  |  |  | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date of Grant 06/15/2017 [Member] | Free Share [Member] | Board of Director [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period (years) |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options granted |  |  |  |  | 5,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share entitlement per free share |  |  |  |  | € 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grant date share fair value (in euros) | € |  |  |  |  | € 61.49 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected dividends |  |  |  |  | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance conditions |  |  |  |  | yes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected turnover during the vesting period |  |  |  |  | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grant Date Twelve [Member] | Free Share [Member] | Board of Director [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period (years) |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options granted |  |  |  | 15,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share entitlement per free share |  |  |  | € 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grant date share fair value (in euros) | € |  |  |  | € 67.44 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected dividends |  |  |  | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance conditions |  |  |  | yes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected turnover during the vesting period |  |  |  | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grant date thirteen [member] | Free Share [Member] | Board of Director [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period (years) |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options granted |  |  | 23,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share entitlement per free share |  |  | € 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grant date share fair value (in euros) | € |  |  | € 69.75 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected dividends |  |  | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance conditions |  |  | yes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected turnover during the vesting period |  |  | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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