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Share-Based Payments - Summary Details of BCE4 (Detail) | 12 Months Ended
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Jan. 20, 2019 EUR (€) | Dec. 31, 2017 | Dec. 15, 2017 | Dec. 05, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Plan expiration date |  |  | 12/15/2027 | 12/05/2027 |  |
Number of options granted |  |  | 8,300 | 625,200 |  |
Black and Scholes Method [Member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Expected volatility |  |  | 43.13% | 43.23% |  |
Expected dividends |  |  | 0.00% | 0.00% |  |
BCE 4 [Member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Number of options granted |  | 0 |  |  | 0 | 0
Not Later Than One Year [member] | BCE 4 [Member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Date of grant (Board of Directors) | Jan. 21, 2009 |  |  |  |  |
Vesting period (years) | 0 years |  |  |  |  |
Plan expiration date | Jan. 20, 2019 |  |  |  |  |
Number of options granted | 2,411 |  |  |  |  |
Share entitlement per BCE4 | 1500.00% |  |  |  |  |
Exercise price (in euros) | € 65 |  |  |  |  |
Not Later Than One Year [member] | BCE 4 [Member] | Black and Scholes Method [Member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Grant date share fair value (in euros) | € 70 |  |  |  |  |
Expected volatility | 40.00% |  |  |  |  |
Average life of BCE4 (in years) | 0 |  |  |  |  |
Discount rate | 2.71% |  |  |  |  |
Expected dividends | 0.00% |  |  |  |  |
Performance conditions | 0.00% |  |  |  |  |
Fair value per BCE4 (in euros) | 2906.00% |  |  |  |  |
Later Than One Year and Not Later Than Two Years [member] | BCE 4 [Member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Date of grant (Board of Directors) | Jan. 21, 2009 |  |  |  |  |
Vesting period (years) | 1 year |  |  |  |  |
Plan expiration date | Jan. 20, 2019 |  |  |  |  |
Number of options granted | 1,340 |  |  |  |  |
Share entitlement per BCE4 | 1500.00% |  |  |  |  |
Exercise price (in euros) | € 65 |  |  |  |  |
Later Than One Year and Not Later Than Two Years [member] | BCE 4 [Member] | Black and Scholes Method [Member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Grant date share fair value (in euros) | € 70 |  |  |  |  |
Expected volatility | 40.00% |  |  |  |  |
Average life of BCE4 (in years) | 0 |  |  |  |  |
Discount rate | 2.71% |  |  |  |  |
Expected dividends | 0.00% |  |  |  |  |
Performance conditions | 0.00% |  |  |  |  |
Fair value per BCE4 (in euros) | 3033.00% |  |  |  |  |
Later Than Two Years and Not Later Than Three Years [member] | BCE 4 [Member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Date of grant (Board of Directors) | Jan. 21, 2009 |  |  |  |  |
Vesting period (years) | 2 years |  |  |  |  |
Plan expiration date | Jan. 20, 2019 |  |  |  |  |
Number of options granted | 536 |  |  |  |  |
Share entitlement per BCE4 | 1500.00% |  |  |  |  |
Exercise price (in euros) | € 65 |  |  |  |  |
Later Than Two Years and Not Later Than Three Years [member] | BCE 4 [Member] | Black and Scholes Method [Member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Grant date share fair value (in euros) | € 70 |  |  |  |  |
Expected volatility | 40.00% |  |  |  |  |
Average life of BCE4 (in years) | 0 |  |  |  |  |
Discount rate | 2.98% |  |  |  |  |
Expected dividends | 0.00% |  |  |  |  |
Performance conditions | 0.00% |  |  |  |  |
Fair value per BCE4 (in euros) | 3190.00% |  |  |  |  |
Later Than Three Years and Not Later Than Four Years [member] | BCE 4 [Member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Date of grant (Board of Directors) | Jan. 21, 2009 |  |  |  |  |
Vesting period (years) | 3 years |  |  |  |  |
Plan expiration date | Jan. 20, 2019 |  |  |  |  |
Number of options granted | 536 |  |  |  |  |
Share entitlement per BCE4 | 1500.00% |  |  |  |  |
Exercise price (in euros) | € 65 |  |  |  |  |
Later Than Three Years and Not Later Than Four Years [member] | BCE 4 [Member] | Black and Scholes Method [Member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Grant date share fair value (in euros) | € 70 |  |  |  |  |
Expected volatility | 40.00% |  |  |  |  |
Average life of BCE4 (in years) | 0 |  |  |  |  |
Discount rate | 2.98% |  |  |  |  |
Expected dividends | 0.00% |  |  |  |  |
Performance conditions | 0.00% |  |  |  |  |
Fair value per BCE4 (in euros) | 3306.00% |  |  |  |  |
Later Than Four Years and Not Later Than Five Years [member] | BCE 4 [Member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Date of grant (Board of Directors) | Jan. 21, 2009 |  |  |  |  |
Vesting period (years) | 4 years |  |  |  |  |
Plan expiration date | Jan. 20, 2019 |  |  |  |  |
Number of options granted | 535 |  |  |  |  |
Share entitlement per BCE4 | 1500.00% |  |  |  |  |
Exercise price (in euros) | € 65 |  |  |  |  |
Later Than Four Years and Not Later Than Five Years [member] | BCE 4 [Member] | Black and Scholes Method [Member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Grant date share fair value (in euros) | € 70 |  |  |  |  |
Expected volatility | 40.00% |  |  |  |  |
Average life of BCE4 (in years) | 0 |  |  |  |  |
Discount rate | 3.11% |  |  |  |  |
Expected dividends | 0.00% |  |  |  |  |
Performance conditions | 0.00% |  |  |  |  |
Fair value per BCE4 (in euros) | 3435.00% |  |  |  |  |

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