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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 |  |  |  |  |  |  |

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