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Summary of Significant Accounting Policies - Assets, Liabilities and Net Assets of Company's Venezuelan Subsidiaries (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Significant Accounting Policies [Line Items]          
Net revenues $ 131,849,139 $ 112,183,360 $ 247,231,460 $ 214,909,107  
Assets 887,964,898   887,964,898   592,362,773
Liabilities (549,449,793)   (549,449,793)   (244,879,165)
Venezuelan Operations [Member]
          
Significant Accounting Policies [Line Items]          
Net revenues     35,908,018 32,694,097  
Assets 59,760,695 126,873,804 59,760,695 126,873,804  
Liabilities (36,209,130) (62,437,338) (36,209,130) (62,437,338)  
Net Assets $ 23,551,565 $ 64,436,466 $ 23,551,565 $ 64,436,466