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Commitments and Contingencies - Additional Information (Detail) | 0 Months Ended | 1 Months Ended |  | 3 Months Ended | 12 Months Ended |  |  | 0 Months Ended
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Sep. 23, 2010 USD ($) | Dec. 31, 2007 USD ($) | Mar. 31, 2014 USD ($) LegalMatter | Mar. 31, 2014 City of Sao Paulo Tax Claim [Member] USD ($) | Mar. 31, 2014 City of Sao Paulo Tax Claim [Member] BRL | Dec. 31, 2013 City of Sao Paulo Tax Claim [Member] BRL | Dec. 31, 2013 City of Sao Paulo Tax Claim [Member] USD ($) | Mar. 31, 2013 City of Sao Paulo Tax Claim [Member] USD ($) | Aug. 25, 2010 State of Sao Paulo Fraud Claim [Member] USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Reserves for proceeding-related contingencies |  |  | $ 3,524,776 |  |  |  |  |  |
Aggregate amount for legal actions for which no loss amount has been accrued |  |  | 4,063,145 |  |  |  |  |  |
Number of legal actions pending |  |  | 636 |  |  |  |  |  |
Loss contingency pending cases related to consumer courts |  |  | 3,191 |  |  |  |  |  |
Daily non-compliance penalty |  |  |  |  |  |  |  |  | 6,000
Penalty established on injunction per day | 6,000 |  |  |  |  |  |  |  |
Approximate additional amount related to asserted taxes and fines |  | 5,900,000 |  | 18,100,000 | 41,000,000 |  |  |  |
Total amount of claim including surcharges and interest |  |  |  |  |  |  |  | 5,800,000 |
Deposit with court |  |  |  |  |  | 9,500,000 |  |  |
Accrued Interests |  |  |  |  |  | 10,400,000 | $ 4,400,000 |  |

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