Stock-Based Compensation - Summary of Unvested Option (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Unvested, options beginning balance	359,375
Granted, options	117,600
Vested, options	(176,200)
Forfeited, options	(5,360)
Unvested, options ending balance	295,415	359,375
Unvested , weighted average grant date fair value beginning balance	$ 9.82
Granted, weighted average grant date fair value	15.41	$ 12.12	$ 12.95
Vested, weighted average grant date fair value	5.66
Forfeited, weighted average grant date fair value	15.41
Unvested , weighted average grant date fair value ending balance	$ 13.59	$ 9.82