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Segment Reporting - Allocation of Goodwill and Intangible Assets Based on Geography (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Other countries goodwill and intangible assets	$ 58,345,157	$ 61,682,300
Total goodwill and intangible assets	58,353,034	61,692,803
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
US intangible assets	7,877	10,503
Argentina [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Other countries goodwill and intangible assets	12,650,884	15,575,776
Brazil [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Other countries goodwill and intangible assets	10,520,047	10,380,974
Mexico [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Other countries goodwill and intangible assets	14,497,179	14,512,949
Venezuela [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Other countries goodwill and intangible assets	6,906,569	6,913,604
Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Other countries goodwill and intangible assets	$ 13,770,478	$ 14,298,997