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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
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