Stockholders' Equity (Details Textual) (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Oct. 31, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Class of Stock [Line Items]
Amortization of Intangible Assets		$ 1,000	$ 900	$ 2,800	$ 1,800
Unrecognized compensation costs related to restricted stock awards		9,600		$ 9,600
Period of stock option compensation cost recognition				2 years 11 months 23 days
Restricted Stock [Member]
Class of Stock [Line Items]
Compensation cost		$ 1,000	$ 2,600	$ 4,000	$ 4,200
Shares of restricted stock granted (in shares)		28		214
Grants in the period, aggregate fair value		$ 511		$ 4,300
Employee Stock Option [Member]
Class of Stock [Line Items]
Options, issued in period (in shares)		15		167
Options, issued in period, weighted average exercise price		$ 19.69		$ 18.88
Grants in period, aggregate fair value		$ 115		$ 1,300
Subsequent Event [Member] | President, Chief Executive Officer, Chairman, Vice Chairman and Board of Directors [Member]
Class of Stock [Line Items]
Options issued (in shares)	1,050
Exercise price (in usd per share)	$ 21.44