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Segment Reporting - Allocation of Long-Lived Tangible Assets Based on Geography (Detail) (USD $)
Jun. 30, 2014
Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]    
Other countries long-lived tangible assets $ 71,801,109 $ 122,240,132
Total long-lived tangible assets 83,780,843 131,371,909
United States [Member]
    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Other countries long-lived tangible assets 11,979,734 9,131,777
Argentina [Member]
    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Other countries long-lived tangible assets 26,563,597 29,119,057
Brazil [Member]
    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Other countries long-lived tangible assets 7,742,432 5,559,702
Mexico [Member]
    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Other countries long-lived tangible assets 1,144,967 711,200
Venezuela [Member]
    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Other countries long-lived tangible assets 33,429,396 83,655,816
Other Countries [Member]
    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Other countries long-lived tangible assets $ 2,920,717 $ 3,194,357