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Share-Based Payments - Summary Of Change in Number of BSAX 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]          
Granted during the period   8,300 625,200    
BSAX [Member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Balance at beginning of period 1,036     1,036 1,036
Granted during the period 0     0 0
Forfeited during the period 0     0 0
Exercised during the period 1,036       1,095
Expired during the period 0     0 0
Balance at end of period       1,036 1,036
BSAX [Member] | Scenario, Previously Reported [Member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Balance at beginning of period         2,131