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Segment Reporting - Allocation of Goodwill and Intangible Assets Based on Geography (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Other countries goodwill and intangible assets	$ 95,737,491	$ 61,682,300
Total goodwill and intangible assets	95,950,947	61,692,803
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
US intangible assets	213,456	10,503
Argentina [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Other countries goodwill and intangible assets	12,369,255	15,575,776
Brazil [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Other countries goodwill and intangible assets	10,899,364	10,380,974
Mexico [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Other countries goodwill and intangible assets	21,670,820	14,512,949
Venezuela [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Other countries goodwill and intangible assets	6,900,347	6,913,604
Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Other countries goodwill and intangible assets	$ 43,897,705	$ 14,298,997