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Segment Reporting - Financial Performance of Company's Reporting Segments (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Segment Reporting Information [Line Items]        
Net revenues $ 131,849,139 $ 112,183,360 $ 247,231,460 $ 214,909,107
Direct costs (70,777,819) (58,869,964) (132,505,589) (116,332,133)
Impairment of Long-Lived Assets (49,495,686)   (49,495,686)  
Direct contribution 11,575,634 53,313,396 65,230,185 98,576,974
Operating expenses and indirect costs of net revenues (17,488,423) (17,864,101) (37,141,885) (34,556,496)
Income (loss) from operations (5,912,789) 35,449,295 28,088,300 64,020,478
Other income (expenses):        
Interest income and other financial gains 3,572,917 2,202,314 6,608,546 5,596,320
Interest expense and other financial losses (778,155) (531,668) (1,805,335) (892,020)
Foreign currency gains (losses) (15,964,572) 3,600,866 (12,871,102) (2,648,848)
Other gains (losses), net   1,393   (2,340)
Net income before income / asset tax expense (19,082,599) 40,722,200 20,020,409 66,073,590
Brazil [Member]
        
Segment Reporting Information [Line Items]        
Net revenues 63,400,348 51,116,153 115,834,447 98,881,836
Direct costs (37,793,126) (27,849,992) (68,310,020) (58,843,536)
Direct contribution 25,607,222 23,266,161 47,524,427 40,038,300
Argentina [Member]
        
Segment Reporting Information [Line Items]        
Net revenues 33,267,193 29,000,836 61,228,937 54,621,583
Direct costs (17,609,259) (16,203,748) (34,523,451) (29,679,458)
Direct contribution 15,657,934 12,797,088 26,705,486 24,942,125
Mexico [Member]
        
Segment Reporting Information [Line Items]        
Net revenues 9,369,842 7,823,566 17,453,027 15,613,867
Direct costs (5,546,333) (5,122,425) (10,293,505) (9,239,252)
Direct contribution 3,823,509 2,701,141 7,159,522 6,374,615
Venezuela [Member]
        
Segment Reporting Information [Line Items]        
Net revenues 16,551,431 17,563,547 35,908,018 32,694,097
Direct costs (4,856,907) (6,478,796) (10,491,888) (12,486,903)
Impairment of Long-Lived Assets (49,495,686)   (49,495,686)  
Direct contribution (37,801,162) 11,084,751 (24,079,556) 20,207,194
Other Countries [Member]
        
Segment Reporting Information [Line Items]        
Net revenues 9,260,325 6,679,258 16,807,031 13,097,724
Direct costs (4,972,194) (3,215,003) (8,886,725) (6,082,984)
Direct contribution $ 4,288,131 $ 3,464,255 $ 7,920,306 $ 7,014,740