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Share-Based Payment - Additional information (Detail)
12 Months Ended
Dec. 15, 2017
Dec. 15, 2016
Dec. 09, 2016
Jun. 21, 2016
Dec. 31, 2017
Dec. 15, 2017
Dec. 05, 2017
Dec. 31, 2016
Top of range [member]                
Disclosure of terms and conditions of share-based payment arrangement [line items]                
Vesting period (years)           4 years 4 years  
Share Option [Member]                
Disclosure of terms and conditions of share-based payment arrangement [line items]                
Share based payment arrangement, shares exercised         1,200     35,000
Share Option [Member] | Date of Grant Seven [Member]                
Disclosure of terms and conditions of share-based payment arrangement [line items]                
Share based payment arrangement, date of grant       Jun. 21, 2016        
Share based payment arrangement, shares exercised 1,100     154,100        
Vesting period (years)   10 years   10 years 10 years      
Share Option [Member] | Date of Grant Eight [Member]                
Disclosure of terms and conditions of share-based payment arrangement [line items]                
Share based payment arrangement, date of grant     Dec. 09, 2016          
Share based payment arrangement, shares exercised     74,960          
Vesting period (years)     10 years          
Share Option [Member] | Date of Grant 06/21/2016 [Member]                
Disclosure of terms and conditions of share-based payment arrangement [line items]                
Share based payment arrangement, date of grant   12/15/2016            
Share Option [Member] | Top of range [member] | Date of Grant Seven [Member] | Not Later Than One Year [member]                
Disclosure of terms and conditions of share-based payment arrangement [line items]                
Share based payment arrangement, vesting percentage   25.00%   25.00% 25.00%      
Share Option [Member] | Top of range [member] | Date of Grant Seven [Member] | Later Than One Year and Not Later Than Two Years [member]                
Disclosure of terms and conditions of share-based payment arrangement [line items]                
Share based payment arrangement, vesting percentage   12.50%   12.50% 12.50%      
Share Option [Member] | Top of range [member] | Date of Grant Seven [Member] | 24 months [Member]                
Disclosure of terms and conditions of share-based payment arrangement [line items]                
Share based payment arrangement, vesting percentage   12.50%   12.50% 12.50%      
Share Option [Member] | Top of range [member] | Date of Grant Seven [Member] | Later Than Two Years and Not Later Than Three Years [member]                
Disclosure of terms and conditions of share-based payment arrangement [line items]                
Share based payment arrangement, vesting percentage   12.50%   12.50% 12.50%      
Share Option [Member] | Top of range [member] | Date of Grant Seven [Member] | 36 months [Member]                
Disclosure of terms and conditions of share-based payment arrangement [line items]                
Share based payment arrangement, vesting percentage   12.50%   12.50% 12.50%      
Share Option [Member] | Top of range [member] | Date of Grant Seven [Member] | Later Than Three Years and Not Later Than Four Years [member]                
Disclosure of terms and conditions of share-based payment arrangement [line items]                
Share based payment arrangement, vesting percentage   12.50%   12.50% 12.50%      
Share Option [Member] | Top of range [member] | Date of Grant Seven [Member] | 48 months [Member]                
Disclosure of terms and conditions of share-based payment arrangement [line items]                
Share based payment arrangement, vesting percentage   12.50%   12.50% 12.50%      
Share Option [Member] | Top of range [member] | Date of Grant Eight [Member] | Not Later Than One Year [member]                
Disclosure of terms and conditions of share-based payment arrangement [line items]                
Share based payment arrangement, shares exercised     18,740          
Share Option [Member] | Top of range [member] | Date of Grant Eight [Member] | Later Than One Year and Not Later Than Two Years [member]                
Disclosure of terms and conditions of share-based payment arrangement [line items]                
Share based payment arrangement, shares exercised     9,370          
Share Option [Member] | Top of range [member] | Date of Grant Eight [Member] | 24 months [Member]                
Disclosure of terms and conditions of share-based payment arrangement [line items]                
Share based payment arrangement, shares exercised     9,370          
Share Option [Member] | Top of range [member] | Date of Grant Eight [Member] | Later Than Two Years and Not Later Than Three Years [member]                
Disclosure of terms and conditions of share-based payment arrangement [line items]                
Share based payment arrangement, shares exercised     9,370          
Share Option [Member] | Top of range [member] | Date of Grant Eight [Member] | 36 months [Member]                
Disclosure of terms and conditions of share-based payment arrangement [line items]                
Share based payment arrangement, shares exercised     9,370          
Share Option [Member] | Top of range [member] | Date of Grant Eight [Member] | Later Than Three Years and Not Later Than Four Years [member]                
Disclosure of terms and conditions of share-based payment arrangement [line items]                
Share based payment arrangement, shares exercised     9,370          
Share Option [Member] | Top of range [member] | Date of Grant Eight [Member] | 48 months [Member]                
Disclosure of terms and conditions of share-based payment arrangement [line items]                
Share based payment arrangement, shares exercised     9,370