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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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Amount of net assets (liabilities).

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Summary of Significant Accounting Policies - Assets, Liabilities and Net Assets of Company's Venezuelan Subsidiaries (Detail) (USD $)	3 Months Ended												12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Significant Accounting Policies [Line Items]
Net revenues	$ 161,369,649us-gaap_SalesRevenueServicesNet	$ 147,934,895us-gaap_SalesRevenueServicesNet	$ 131,849,139us-gaap_SalesRevenueServicesNet	$ 115,382,319us-gaap_SalesRevenueServicesNet	$ 134,630,171us-gaap_SalesRevenueServicesNet	$ 123,055,431us-gaap_SalesRevenueServicesNet	$ 112,183,360us-gaap_SalesRevenueServicesNet	$ 102,725,747us-gaap_SalesRevenueServicesNet	$ 103,754,645us-gaap_SalesRevenueServicesNet	$ 97,266,784us-gaap_SalesRevenueServicesNet	$ 88,844,059us-gaap_SalesRevenueServicesNet	$ 83,736,006us-gaap_SalesRevenueServicesNet	$ 556,536,002us-gaap_SalesRevenueServicesNet	$ 472,594,709us-gaap_SalesRevenueServicesNet	$ 373,601,494us-gaap_SalesRevenueServicesNet
Assets	966,847,735us-gaap_Assets				592,362,773us-gaap_Assets								966,847,735us-gaap_Assets	592,362,773us-gaap_Assets
Liabilities	(611,059,325)us-gaap_Liabilities				(244,879,165)us-gaap_Liabilities								(611,059,325)us-gaap_Liabilities	(244,879,165)us-gaap_Liabilities
Venezuelan Operations [Member]
Significant Accounting Policies [Line Items]
Net revenues													58,025,886	84,572,485	54,676,170
Assets	75,152,574				126,873,804								75,152,574	126,873,804
Liabilities	(43,358,945)				(62,437,338)								(43,358,945)	(62,437,338)
Net Assets	$ 31,793,629				$ 64,436,466								$ 31,793,629	$ 64,436,466