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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

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