Income (loss) from Continuing Operations before Income Taxes (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Schedule of Income Before Income Tax [Line Items]
Income from operations before taxes	$ 11,914,375	$ 7,031,537	$ 20,625,263	$ 53,517,667
United States
Schedule of Income Before Income Tax [Line Items]
Income from operations before taxes	(194,487)	(864,242)	(985,192)	(3,172,630)
Foreign
Schedule of Income Before Income Tax [Line Items]
Income from operations before taxes	$ 12,108,862	$ 7,895,779	$ 21,610,455	$ 56,690,297