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Segment Reporting - Financial Performance of Company's Reporting Segments (Detail) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Segment Reporting Information [Line Items] |  |  |  |
Net revenues | $ 112,183,360 | $ 88,844,059 | $ 214,909,107 | $ 172,580,065
Direct costs | (58,869,964) | (44,504,824) | (116,332,133) | (89,680,613)
Direct contribution | 53,313,396 | 44,339,235 | 98,576,974 | 82,899,452
Operating expenses and indirect costs of net revenues | (17,864,101) | (12,454,315) | (34,556,496) | (26,083,786)
Income from operations | 35,449,295 | 31,884,920 | 64,020,478 | 56,815,666
Other income (expenses): |  |  |  |
Interest income and other financial gains | 2,202,314 | 2,982,303 | 5,596,320 | 6,070,862
Interest expense and other financial losses | (531,668) | (474,300) | (892,020) | (551,617)
Foreign currency gain (loss) | 3,600,866 | 749,008 | (2,648,848) | (283,969)
Other gains (losses), net | 1,393 | (7,009) | (2,340) | (11,263)
Net income before income / asset tax expense | 40,722,200 | 35,134,922 | 66,073,590 | 62,039,679
Brazil [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenues | 51,116,153 | 44,205,857 | 98,881,836 | 86,370,511
Direct costs | (27,849,992) | (25,066,435) | (58,843,536) | (50,809,649)
Direct contribution | 23,266,161 | 19,139,422 | 40,038,300 | 35,560,862
Argentina [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenues | 29,000,836 | 20,561,213 | 54,621,583 | 38,677,682
Direct costs | (16,203,748) | (9,543,476) | (29,679,458) | (17,666,411)
Direct contribution | 12,797,088 | 11,017,737 | 24,942,125 | 21,011,271
Mexico [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenues | 7,823,566 | 6,046,812 | 15,613,867 | 12,630,678
Direct costs | (5,122,425) | (3,269,574) | (9,239,252) | (6,916,211)
Direct contribution | 2,701,141 | 2,777,238 | 6,374,615 | 5,714,467
Venezuela [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenues | 17,563,547 | 12,417,318 | 32,694,097 | 23,658,890
Direct costs | (6,478,796) | (3,728,913) | (12,486,903) | (8,576,248)
Direct contribution | 11,084,751 | 8,688,405 | 20,207,194 | 15,082,642
Other Countries [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenues | 6,679,258 | 5,612,859 | 13,097,724 | 11,242,304
Direct costs | (3,215,003) | (2,896,426) | (6,082,984) | (5,712,094)
Direct contribution | $ 3,464,255 | $ 2,716,433 | $ 7,014,740 | $ 5,530,210

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