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Share-Based Payments - Disclosure of Details of Breakdown of the Closing Balance BSAX (Detail) - BSAX [Member]
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Outstanding 1,036 1,036 1,036
Exercisable   1,036 1,036