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Contingencies - Additional Information (Detail)
BRL in Millions, $ in Millions
1 Months Ended 6 Months Ended
Nov. 22, 2011
USD ($)
Nov. 22, 2011
BRL
Jun. 30, 2017
BRL
May 31, 2012
USD ($)
Loss Contingencies [Line Items]        
Damages asserted by BK | BRL     BRL 20.8  
Business combination, recognized identifiable assets acquired and liabilities assumed, contingent liability | $       $ 2.9
Court-Imposed Interest, Fees or Inflation Adjustments        
Loss Contingencies [Line Items]        
Total ordered damages granted to Bk | $ $ 8.1      
Court-Imposed Interest, Fees or Inflation Adjustments | Maximum        
Loss Contingencies [Line Items]        
Total ordered damages granted to Bk | BRL   BRL 26.7