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Segment Reporting - Allocation of Long-Lived Tangible Assets Based on Geography (Detail) (USD $)
Mar. 31, 2014
Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]    
Other countries long-lived tangible assets $ 118,291,797 $ 122,240,132
Total long-lived tangible assets 129,464,927 131,371,909
United States [Member]
    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Other countries long-lived tangible assets 11,173,130 9,131,777
Argentina [Member]
    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Other countries long-lived tangible assets 24,408,513 29,119,057
Brazil [Member]
    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Other countries long-lived tangible assets 6,725,644 5,559,702
Mexico [Member]
    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Other countries long-lived tangible assets 821,222 711,200
Venezuela [Member]
    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Other countries long-lived tangible assets 83,447,404 83,655,816
Other Countries [Member]
    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Other countries long-lived tangible assets $ 2,889,014 $ 3,194,357