Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Summary Of Significant Accounting Policies [Line Items]
Stock-based compensation expense	$ 1.1	$ 0.6
2008 Plan [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock options surrendered by employees, shares	280,000
Requisite service period of awards	3 years
2016 Restricted Stock [Member] | 2008 Plan [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of shares granted	452,422
Restricted stock, vesting percentage	100.00%
Restricted stock, vesting period	3 years