Segments - Allocation of Long-Lived Tangible Assets Based on Geography (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Other countries long-lived tangible assets	$ 122,240,132	$ 30,944,145
Total long-lived tangible assets	131,371,909	37,726,222
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Other countries long-lived tangible assets	9,131,777	6,782,077
Argentina [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Other countries long-lived tangible assets	29,119,057	16,955,438
Brazil [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Other countries long-lived tangible assets	5,559,702	2,421,618
Mexico [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Other countries long-lived tangible assets	711,200	378,653
Venezuela [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Other countries long-lived tangible assets	83,655,816	8,455,816
Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Other countries long-lived tangible assets	$ 3,194,357	$ 2,732,620