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Share-Based Payments - Summary of Details of Share Based Payment Arrangement BCE 2010 (Detail)
12 Months Ended
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