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Share-Based Payments - Summary Details of BCE4 (Detail)
 12 Months Ended
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%