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Business Combinations, Goodwill and Intangible Assets - Table Showing Changes in Carrying Amount of Goodwill (Detail) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Mar. 22, 2013
Goodwill [Line Items]      
Balance, beginning of the period $ 55,101,218 $ 60,366,063 $ 2,668,661
Business Acquisition   2,668,661  
Effect of exchange rates changes (3,141,788) (7,933,506)  
Balance, end of the period 51,959,430 55,101,218 2,668,661
Brazil [Member]
      
Goodwill [Line Items]      
Balance, beginning of the period 10,366,018 10,706,281  
Business Acquisition   1,307,644  
Effect of exchange rates changes 138,486 (1,647,907)  
Balance, end of the period 10,504,504 10,366,018  
Argentina [Member]
      
Goodwill [Line Items]      
Balance, beginning of the period 14,676,145 18,889,094  
Business Acquisition   659,159  
Effect of exchange rates changes (2,775,163) (4,872,108)  
Balance, end of the period 11,900,982 14,676,145  
Chile [Member]
      
Goodwill [Line Items]      
Balance, beginning of the period 6,520,194 7,115,211  
Effect of exchange rates changes (317,050) (595,017)  
Balance, end of the period 6,203,144 6,520,194  
Mexico [Member]
      
Goodwill [Line Items]      
Balance, beginning of the period 11,376,140 11,404,780  
Business Acquisition   186,806  
Effect of exchange rates changes (68,795) (215,446)  
Balance, end of the period 11,307,345 11,376,140  
Venezuela [Member]
      
Goodwill [Line Items]      
Balance, beginning of the period   4,846,030  
Business Acquisition   405,637  
Balance, end of the period 5,251,667 5,251,667  
Colombia [Member]
      
Goodwill [Line Items]      
Balance, beginning of the period 5,506,062 5,897,136  
Business Acquisition   69,385  
Effect of exchange rates changes (115,016) (460,459)  
Balance, end of the period 5,391,046 5,506,062  
Other Countries [Member]
      
Goodwill [Line Items]      
Balance, beginning of the period 1,404,992 1,507,531  
Business Acquisition   40,030  
Effect of exchange rates changes (4,250) (142,569)  
Balance, end of the period $ 1,400,742 $ 1,404,992