Stockholders' Equity (Details Textual) (Detail) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2017 USD ($) $ / shares shares
Restricted Stock
Class of Stock [Line Items]
Shares of restricted stock granted (in shares) | shares	223
Grants in the period, aggregate fair value | $	$ 3.4
Unrecognized compensation costs related to restricted stock awards | $	$ 7.8
Weighted average period of recognition	2 years 11 months 12 days
Employee Stock Option
Class of Stock [Line Items]
Unrecognized compensation costs related to restricted stock awards | $	$ 5.2
Weighted average period of recognition	2 years 11 months 23 days
Options, granted (in shares) | shares	239
Weighted average exercise price (in dollars per share) | $ / shares	$ 15.03
Performance Restricted Stock Units
Class of Stock [Line Items]
Options, granted (in shares) | shares	45
Award vesting period	3 years