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Share-Based Payments - Summary Details of BSA2 (Detail) |  | 12 Months Ended
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Jan. 20, 2019 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 BSA2 | € / shares |  |  | € 1 | € 1 |  |
BSA 2 [Member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Number of options granted |  | 0 |  |  | 0 | 0
Board of Director [Member] | BSA 2 [Member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Vesting period (years) | 0 years |  |  |  |  |
Plan expiration date | Jan. 20, 2019 |  |  |  |  |
Number of options granted | 4,822 |  |  |  |  |
Share entitlement per BSA2 | € / shares | € 15 |  |  |  |  |
Exercise price (in euros) | € 65 |  |  |  |  |
Valuation method used |  |  |  |  |  |
Grant date share fair value (in euros) | € 70 |  |  |  |  |
Expected volatility | 40.00% |  |  |  |  |
Average life of BCE2010 (in years) | 0 |  |  |  |  |
Discount rate | 2.71% |  |  |  |  |
Expected dividends | 0.00% |  |  |  |  |
Fair value per BSA2 (in euros) | € 29.05 |  |  |  |  |
Board of Director [Member] | BSA 2 [Member] | First Anniversary [Member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Vesting period (years) | 1 year |  |  |  |  |
Plan expiration date | Jan. 20, 2019 |  |  |  |  |
Number of options granted | 2,680 |  |  |  |  |
Share entitlement per BSA2 | € / shares | € 15 |  |  |  |  |
Exercise price (in euros) | € 65 |  |  |  |  |
Valuation method used |  |  |  |  |  |
Grant date share fair value (in euros) | € 70 |  |  |  |  |
Expected volatility | 40.00% |  |  |  |  |
Average life of BCE2010 (in years) | 0 |  |  |  |  |
Discount rate | 2.71% |  |  |  |  |
Expected dividends | 0.00% |  |  |  |  |
Fair value per BSA2 (in euros) | € 30.32 |  |  |  |  |
Board of Director [Member] | BSA 2 [Member] | Second Anniversary [Member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Vesting period (years) | 2 years |  |  |  |  |
Plan expiration date | Jan. 20, 2019 |  |  |  |  |
Number of options granted | 1,072 |  |  |  |  |
Share entitlement per BSA2 | € / shares | € 15 |  |  |  |  |
Exercise price (in euros) | € 65 |  |  |  |  |
Valuation method used |  |  |  |  |  |
Grant date share fair value (in euros) | € 70 |  |  |  |  |
Expected volatility | 40.00% |  |  |  |  |
Average life of BCE2010 (in years) | 0 |  |  |  |  |
Discount rate | 2.98% |  |  |  |  |
Expected dividends | 0.00% |  |  |  |  |
Fair value per BSA2 (in euros) | € 31.89 |  |  |  |  |
Board of Director [Member] | BSA 2 [Member] | Third Anniversary [Member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Vesting period (years) | 3 years |  |  |  |  |
Plan expiration date | Jan. 20, 2019 |  |  |  |  |
Number of options granted | 1,072 |  |  |  |  |
Share entitlement per BSA2 | € / shares | € 15 |  |  |  |  |
Exercise price (in euros) | € 65 |  |  |  |  |
Valuation method used |  |  |  |  |  |
Grant date share fair value (in euros) | € 70 |  |  |  |  |
Expected volatility | 40.00% |  |  |  |  |
Average life of BCE2010 (in years) | 0 |  |  |  |  |
Discount rate | 2.98% |  |  |  |  |
Expected dividends | 0.00% |  |  |  |  |
Fair value per BSA2 (in euros) | € 33.05 |  |  |  |  |
Board of Director [Member] | BSA 2 [Member] | Fourth Anniversary [Member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Vesting period (years) | 4 years |  |  |  |  |
Plan expiration date | Jan. 20, 2019 |  |  |  |  |
Number of options granted | 1,070 |  |  |  |  |
Share entitlement per BSA2 | € / shares | € 15 |  |  |  |  |
Exercise price (in euros) | € 65 |  |  |  |  |
Valuation method used |  |  |  |  |  |
Grant date share fair value (in euros) | € 70 |  |  |  |  |
Expected volatility | 40.00% |  |  |  |  |
Average life of BCE2010 (in years) | 0 |  |  |  |  |
Discount rate | 3.11% |  |  |  |  |
Expected dividends | 0.00% |  |  |  |  |
Fair value per BSA2 (in euros) | € 33.45 |  |  |  |  |

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- Definition The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_47_a_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The percentage of an expected dividend used to calculate the fair value of share options granted. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_47_a_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The weighted average exercise price of other equity instruments (ie other than share options) exercised or vested in a share-based payment arrangement. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The weighted average fair value at the measurement date of granted equity instruments other than share options. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_47_b&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The weighted average fair value of share options granted during the period at the measurement date. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 47 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_47_a&doctype=Standard -URIDate 2017-03-09 + Details
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