Equity - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2009	Dec. 31, 2015	Jan. 22, 2009
Equity [Abstract]
Preferred stock, shares outstanding	0		0
Authorization for purchase of company's common stock				$ 10,000,000
Purchase common stock shares	144,315	349,800
Average cost of per share	$ 17.29	$ 2.67
Purchase common stock value	$ 2,500,000	$ 900,000