Stockholders' Equity (Details Textual) (Detail) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended				9 Months Ended
	Sep. 22, 2016	Jun. 02, 2016	Sep. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Sep. 30, 2016	Sep. 30, 2015
Class of Stock [Line Items]
Proceeds from issuance of common stock							$ 49,315	$ 539
Exercise price (in dollars per share)				$ 22.99	$ 21.44
Restricted Stock
Class of Stock [Line Items]
Shares of restricted stock granted (in shares)			89,000				242,000
Grants in the period, aggregate fair value			$ 1,200				$ 4,200
Period of stock option compensation cost recognition							2 years 9 months 18 days
Employee Stock Option
Class of Stock [Line Items]
Options, granted (in shares)			3,000				1,100,000
Weighted average exercise price (in dollars per share)						$ 21.49	$ 15.15
Stock Compensation Plan
Class of Stock [Line Items]
Unrecognized compensation costs related to restricted stock awards			$ 12,100				$ 12,100
President, Chief Executive Officer, Chairman, Vice Chairman and Board of Directors
Class of Stock [Line Items]
Options, granted (in shares)					1,100,000
Chief Financial Officer, Senior Vice President and General Counsel, and Senior Vice President of Mergers and Acquisitions | Restricted Stock
Class of Stock [Line Items]
Options, granted (in shares)				34,000
Chief Financial Officer, Senior Vice President and General Counsel, and Senior Vice President of Mergers and Acquisitions | Employee Stock Option
Class of Stock [Line Items]
Options, granted (in shares)				52,000
Long Term Incentive Plan
Class of Stock [Line Items]
Number of additional shares authorized (in shares)		4,000,000
Rights Offering | Common Stock
Class of Stock [Line Items]
Stock issued during period, value	$ 49,900
Rights Offering | Common Stock | Bridge Loan
Class of Stock [Line Items]
Common stock, value, subscriptions (in shares)	4,000,000
Share price (in dollars per share)	$ 12.25
Stock issued, issuance costs	$ 600
Proceeds from issuance of common stock	$ 49,300