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Income Tax - Reconciliation of Accounting Profit and Income Tax Expense (Parenthetical) (Detail)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reconciliation Of Accounting Profit Multiplied By Applicable Tax Rates [Abstract]      
Statutory rate 17.00% 17.00% 17.00%