Income (loss) from Continuing Operations before Income Taxes (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Schedule of Income Before Income Tax [Line Items]
Income from operations before taxes	$ 7,031,537	$ 15,227,596	$ 53,517,667	$ 28,079,903
United States
Schedule of Income Before Income Tax [Line Items]
Income from operations before taxes	(864,242)	(669,423)	(3,172,630)	(1,821,093)
Foreign
Schedule of Income Before Income Tax [Line Items]
Income from operations before taxes	$ 7,895,779	$ 15,897,019	$ 56,690,297	$ 29,900,996