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Income Taxes - Summary of Reconciliation of Income Tax Expense (Parenthetical) (Detail) - INR (₨)
12 Months Ended
Dec. 31, 2017
Mar. 31, 2018
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]    
US federal tax rate 35.00% 21.00%
Re-statement of deferred tax   ₨ 1,563