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Summary of Significant Accounting Policies - Assets, Liabilities and Net Assets of Company's Venezuelan Subsidiaries (Detail) (USD $)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Significant Accounting Policies [Line Items]      
Net revenues $ 115,382,319 $ 102,725,747  
Assets 597,858,668   592,362,773
Liabilities (243,993,312)   (244,879,165)
Venezuelan Operations [Member]
     
Significant Accounting Policies [Line Items]      
Net revenues 19,356,587 15,130,551  
Assets 125,455,211 126,873,804  
Liabilities (51,591,061) (62,437,338)  
Net Assets $ 73,864,150 $ 64,436,466