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Business Combinations, Goodwill and Intangible Assets - Table Showing Changes in Carrying Amount of Goodwill (Detail) (USD $)
 6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Goodwill [Line Items]    
Balance, beginning of the period $ 55,101,218 $ 60,366,063
Business Acquisition 17,939,365 2,668,661
Effect of exchange rates change (2,772,737) (7,933,506)
Balance, end of the period 70,267,846 55,101,218
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 change 390,572 (1,647,907)
Balance, end of the period 10,756,590 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 change (2,989,282) (4,872,108)
Balance, end of the period 11,686,863 14,676,145
Chile [Member]
    
Goodwill [Line Items]    
Balance, beginning of the period 6,520,194 7,115,211
Business Acquisition 12,384,798  
Effect of exchange rates change (341,628) (595,017)
Balance, end of the period 18,563,364 6,520,194
Mexico [Member]
    
Goodwill [Line Items]    
Balance, beginning of the period 11,376,140 11,404,780
Business Acquisition 5,554,567 186,806
Effect of exchange rates change 74,173 (215,446)
Balance, end of the period 17,004,880 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 change 120,498 (460,459)
Balance, end of the period 5,626,560 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 change (27,070) (142,569)
Balance, end of the period $ 1,377,922 $ 1,404,992