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Commitments and Contingencies - Additional Information (Detail)
 1 Months Ended 1 Months Ended
Sep. 23, 2010
USD ($)
Jun. 30, 2013
USD ($)
LegalMatter
Aug. 25, 2010
State of Sao Paulo Fraud Claim [Member]
USD ($)
Sep. 30, 2012
City of Sao Paulo Tax Claim [Member]
USD ($)
Sep. 30, 2012
City of Sao Paulo Tax Claim [Member]
BRL
Loss Contingencies [Line Items]          
Reserves for proceeding-related contingencies   $ 3,367,731      
Aggregate amount for legal actions for which no loss amount has been accrued   4,036,160      
Number of legal actions pending   595      
Loss contingency pending cases related to consumer courts   3,504      
Daily non-compliance penalty     6,000    
Penalty established on injunction 6,000        
Approximate additional amount related to asserted taxes and fines       $ 11,400,000 23,000,000