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Share-Based Payments - Disclosure of Change in Number of Share Options Outstanding (Detail)
 12 Months Ended
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]          
Number of options granted   8,300 625,200    
Share Option [Member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Balance at beginning of period 1,160,060     861,000 546,000
Number of options granted 998,500     359,060 315,000
Forfeited during the period 24,260     25,000  
Exercised during the period 1,200     35,000  
Expired during the period 0     0 0
Balance at end of period 2,133,100     1,160,060 861,000