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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

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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The net of assets and liabilities.

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Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts.

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