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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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