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Share-Based Payments - Summary of Details of Share Based Payment Arrangement BCE 2010 (Detail) |  |  | 12 Months Ended
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Nov. 22, 2011 EUR (€) € / shares | Jun. 24, 2011 EUR (€) € / shares | Dec. 31, 2017 | Dec. 15, 2017 EUR (€) € / shares | Dec. 05, 2017 EUR (€) € / shares | 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 |  |
Share entitlement per BCE2010(1) | € / shares |  |  |  | € 1 | € 1 |  |
Black and Scholes Method [Member] |  |  |  |  |  |  |
Valuation method used |  |  |  |  |  |  |
Grant date share fair value (in euros) | € |  |  |  | € 36.43 | € 35.73 |  |
Expected volatility |  |  |  | 43.13% | 43.23% |  |
Expected dividends |  |  |  | 0.00% | 0.00% |  |
BCE2010 [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Number of BCE2010 granted |  |  | 0 |  |  | 0 | 0
Not Later Than One Year [member] | Date of Grant One [Member] | Board of Director [Member] | BCE2010 [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Vesting period (years) |  | 6 months |  |  |  |  |
Plan expiration date |  | Nov. 22, 2021 |  |  |  |  |
Number of BCE2010 granted |  | 6,000 |  |  |  |  |
Share entitlement per BCE2010(1) | € / shares |  | € 15 |  |  |  |  |
Exercise price (in euros) | € |  | € 77 |  |  |  |  |
Not Later Than One Year [member] | Date of Grant One [Member] | Board of Director [Member] | BCE2010 [Member] | Black and Scholes Method [Member] |  |  |  |  |  |  |
Valuation method used |  |  |  |  |  |  |
Grant date share fair value (in euros) | € |  | € 77 |  |  |  |  |
Expected volatility |  | 40.00% |  |  |  |  |
Average life of BCE2010 (in years) |  | 0 |  |  |  |  |
Discount rate(2) |  | 2.55% |  |  |  |  |
Expected dividends |  | 0.00% |  |  |  |  |
Fair value per BCE2010 (in euros) | € / shares |  | € 31.16 |  |  |  |  |
Not Later Than One Year [member] | Date of Grant Two [Member] | Board of Director [Member] | BCE2010 [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Vesting period (years) | 1 year |  |  |  |  |  |
Plan expiration date | Nov. 22, 2021 |  |  |  |  |  |
Number of BCE2010 granted | 2,510 |  |  |  |  |  |
Share entitlement per BCE2010(1) | € / shares | € 15 |  |  |  |  |  |
Exercise price (in euros) | € | € 77 |  |  |  |  |  |
Not Later Than One Year [member] | Date of Grant Two [Member] | Board of Director [Member] | BCE2010 [Member] | Black and Scholes Method [Member] |  |  |  |  |  |  |
Valuation method used |  |  |  |  |  |  |
Grant date share fair value (in euros) | € | € 77 |  |  |  |  |  |
Expected volatility | 40.00% |  |  |  |  |  |
Average life of BCE2010 (in years) | 0 |  |  |  |  |  |
Discount rate(2) | 2.05% |  |  |  |  |  |
Expected dividends | 0.00% |  |  |  |  |  |
Fair value per BCE2010 (in euros) | € / shares | € 30.42 |  |  |  |  |  |
Later Than One Year and Not Later Than Two Years [member] | Date of Grant One [Member] | Board of Director [Member] | BCE2010 [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Vesting period (years) |  | 1 year 6 months |  |  |  |  |
Plan expiration date |  | Nov. 22, 2021 |  |  |  |  |
Number of BCE2010 granted |  | 6,000 |  |  |  |  |
Share entitlement per BCE2010(1) | € / shares |  | € 15 |  |  |  |  |
Exercise price (in euros) | € |  | € 77 |  |  |  |  |
Later Than One Year and Not Later Than Two Years [member] | Date of Grant One [Member] | Board of Director [Member] | BCE2010 [Member] | Black and Scholes Method [Member] |  |  |  |  |  |  |
Valuation method used |  |  |  |  |  |  |
Grant date share fair value (in euros) | € |  | € 77 |  |  |  |  |
Expected volatility |  | 40.00% |  |  |  |  |
Average life of BCE2010 (in years) |  | 0 |  |  |  |  |
Discount rate(2) |  | 2.68% |  |  |  |  |
Expected dividends |  | 0.00% |  |  |  |  |
Fair value per BCE2010 (in euros) | € / shares |  | € 32.71 |  |  |  |  |
Later Than One Year and Not Later Than Two Years [member] | Date of Grant Two [Member] | Board of Director [Member] | BCE2010 [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Vesting period (years) | 2 years |  |  |  |  |  |
Plan expiration date | Nov. 22, 2021 |  |  |  |  |  |
Number of BCE2010 granted | 2,510 |  |  |  |  |  |
Share entitlement per BCE2010(1) | € / shares | € 15 |  |  |  |  |  |
Exercise price (in euros) | € | € 77 |  |  |  |  |  |
Later Than One Year and Not Later Than Two Years [member] | Date of Grant Two [Member] | Board of Director [Member] | BCE2010 [Member] | Black and Scholes Method [Member] |  |  |  |  |  |  |
Valuation method used |  |  |  |  |  |  |
Grant date share fair value (in euros) | € | € 77 |  |  |  |  |  |
Expected volatility | 40.00% |  |  |  |  |  |
Average life of BCE2010 (in years) | 0 |  |  |  |  |  |
Discount rate(2) | 2.42% |  |  |  |  |  |
Expected dividends | 0.00% |  |  |  |  |  |
Fair value per BCE2010 (in euros) | € / shares | € 32.29 |  |  |  |  |  |
Later Than Two Years and Not Later Than Three Years [member] | Date of Grant One [Member] | Board of Director [Member] | BCE2010 [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Vesting period (years) |  | 2 years 6 months |  |  |  |  |
Plan expiration date |  | Nov. 22, 2021 |  |  |  |  |
Number of BCE2010 granted |  | 6,000 |  |  |  |  |
Share entitlement per BCE2010(1) | € / shares |  | € 15 |  |  |  |  |
Exercise price (in euros) | € |  | € 77 |  |  |  |  |
Later Than Two Years and Not Later Than Three Years [member] | Date of Grant One [Member] | Board of Director [Member] | BCE2010 [Member] | Black and Scholes Method [Member] |  |  |  |  |  |  |
Valuation method used |  |  |  |  |  |  |
Grant date share fair value (in euros) | € |  | € 77 |  |  |  |  |
Expected volatility |  | 40.00% |  |  |  |  |
Average life of BCE2010 (in years) |  | 0 |  |  |  |  |
Discount rate(2) |  | 2.68% |  |  |  |  |
Expected dividends |  | 0.00% |  |  |  |  |
Fair value per BCE2010 (in euros) | € / shares |  | € 34.03 |  |  |  |  |
Later Than Two Years and Not Later Than Three Years [member] | Date of Grant Two [Member] | Board of Director [Member] | BCE2010 [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Vesting period (years) | 3 years |  |  |  |  |  |
Plan expiration date | Nov. 22, 2021 |  |  |  |  |  |
Number of BCE2010 granted | 2,510 |  |  |  |  |  |
Share entitlement per BCE2010(1) | € / shares | € 15 |  |  |  |  |  |
Exercise price (in euros) | € | € 77 |  |  |  |  |  |
Later Than Two Years and Not Later Than Three Years [member] | Date of Grant Two [Member] | Board of Director [Member] | BCE2010 [Member] | Black and Scholes Method [Member] |  |  |  |  |  |  |
Valuation method used |  |  |  |  |  |  |
Grant date share fair value (in euros) | € | € 77 |  |  |  |  |  |
Expected volatility | 40.00% |  |  |  |  |  |
Average life of BCE2010 (in years) | 0 |  |  |  |  |  |
Discount rate(2) | 2.42% |  |  |  |  |  |
Expected dividends | 0.00% |  |  |  |  |  |
Fair value per BCE2010 (in euros) | € / shares | € 33.58 |  |  |  |  |  |
Later Than Three Years and Not Later Than Four Years [member] | Date of Grant One [Member] | Board of Director [Member] | BCE2010 [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Vesting period (years) |  | 3 years 6 months |  |  |  |  |
Plan expiration date |  | Nov. 22, 2021 |  |  |  |  |
Number of BCE2010 granted |  | 6,000 |  |  |  |  |
Share entitlement per BCE2010(1) | € / shares |  | € 15 |  |  |  |  |
Exercise price (in euros) | € |  | € 77 |  |  |  |  |
Later Than Three Years and Not Later Than Four Years [member] | Date of Grant One [Member] | Board of Director [Member] | BCE2010 [Member] | Black and Scholes Method [Member] |  |  |  |  |  |  |
Valuation method used |  |  |  |  |  |  |
Grant date share fair value (in euros) | € |  | € 77 |  |  |  |  |
Expected volatility |  | 40.00% |  |  |  |  |
Average life of BCE2010 (in years) |  | 0 |  |  |  |  |
Discount rate(2) |  | 2.87% |  |  |  |  |
Expected dividends |  | 0.00% |  |  |  |  |
Fair value per BCE2010 (in euros) | € / shares |  | € 35.58 |  |  |  |  |
Later Than Three Years and Not Later Than Four Years [member] | Date of Grant Two [Member] | Board of Director [Member] | BCE2010 [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Vesting period (years) | 4 years |  |  |  |  |  |
Plan expiration date | Nov. 22, 2021 |  |  |  |  |  |
Number of BCE2010 granted | 2,509 |  |  |  |  |  |
Share entitlement per BCE2010(1) | € / shares | € 15 |  |  |  |  |  |
Exercise price (in euros) | € | € 77 |  |  |  |  |  |
Later Than Three Years and Not Later Than Four Years [member] | Date of Grant Two [Member] | Board of Director [Member] | BCE2010 [Member] | Black and Scholes Method [Member] |  |  |  |  |  |  |
Valuation method used |  |  |  |  |  |  |
Grant date share fair value (in euros) | € | € 77 |  |  |  |  |  |
Expected volatility | 40.00% |  |  |  |  |  |
Average life of BCE2010 (in years) | 0 |  |  |  |  |  |
Discount rate(2) | 2.66% |  |  |  |  |  |
Expected dividends | 0.00% |  |  |  |  |  |
Fair value per BCE2010 (in euros) | € / shares | € 35.20 |  |  |  |  |  |

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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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