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Stockholders' Equity - Additional Information (Detail)
 12 Months Ended
Apr. 19, 2016
Dec. 31, 2016
USD ($)
Employee
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
shares
Stockholders Equity [Line Items]        
Incremental fair value of modified award | $   $ 469,000 $ 2,411,000 $ 1,502,000
Requisite service period reorganization of stock on strait-line basis   3 years    
Term of historical volatility of common stock   6 years    
Number of shares converted   1,500,000    
2015 Restricted Stock [Member]        
Stockholders Equity [Line Items]        
Restricted stock, vesting percentage per year   33.33%    
Restricted stock, vesting period   3 years    
2016 Restricted Stock [Member]        
Stockholders Equity [Line Items]        
Restricted stock, vesting percentage   100.00%    
Restricted stock, vesting percentage per year   33.33%    
Restricted stock, vesting period   3 years    
Restricted Stock [Member]        
Stockholders Equity [Line Items]        
Awards granted   850,771 584,959  
Incremental fair value of modified award | $   $ 1,500,000    
Approximate grant date fair value | $   $ 2,579,000 $ 405,000  
Weighted average grant date fair value | $ / shares   $ 7.82 $ 7.18  
Restricted Stock Units (RSUs) [Member]        
Stockholders Equity [Line Items]        
Approximate grant date fair value | $   $ 375,000    
Weighted average grant date fair value | $ / shares   $ 13.56    
Vesting description   Vesting occurs upon the earliest to occur: (i) the director’s separation from service, (ii) the third anniversary of the grant date, or (iii) the occurrence of a change of control as defined by the agreement.    
Restricted Stock Units (RSUs) [Member] | Non Employee Directors [Member]        
Stockholders Equity [Line Items]        
Awards granted   27,654    
Preferred Share Rights Plan [Member]        
Stockholders Equity [Line Items]        
Preferred share right plan description   If a person or group acquires 15% or more of our common stock, each Right will entitle the holder (other than the person or group that triggered the Rights being exercisable) to purchase shares of our common stock (or, in certain circumstances, cash or other securities) having a market value of twice the exercise price of a Right at such time.    
Minimum percentage of ownership of common stock required to exercise preferred share rights   15.00%    
Exercise price of Preferred Stock   $47.75 per one one-hundredth of a share    
Redemption price preferred share rights | $ / shares     $ 0.01  
Maximum time for redemption after the Rights become exercisable   10 days    
Preferred share right exchange ratio   1    
Minimum percentage of beneficial ownership of common stock to end preferred share rights exchange   50.00%    
2016 Plan [Member]        
Stockholders Equity [Line Items]        
Long term incentive plan, effective date   Apr. 19, 2016    
Term of long term incentive plan 10 years      
Aggregate number of shares reserved and available for issuance   2,632,332    
Minimum exercise price of stock option at grant date   No less than 100% of the fair market value, as defined in the 2016 Plan, of the shares on the date of grant.    
Percentage of fair market value   100.00%    
Maximum term of stock option   10 years    
Options granted   0    
2016 Plan [Member] | Maximum [Member]        
Stockholders Equity [Line Items]        
Aggregate number of shares reserved and available for issuance   2,750,000    
2008 Plan [Member]        
Stockholders Equity [Line Items]        
Awards granted   0    
Shares surrendered by the number of employees | Employee   4    
Number of shares surrendered by the employee during the period   280,000    
Total stock based compensation expense not yet recognized, relating to non-vested restricted stock and stock options | $   $ 10,170,000    
2008 Plan [Member] | 2015 Stock Options [Member]        
Stockholders Equity [Line Items]        
Number of shares of stock options granted     135,000  
Options vest at a percentage rate for first 5 years     16.50%  
Options final year vesting   End of the sixth year    
2008 Plan [Member] | 2015 Stock Options [Member] | Discontinued Operations [Member]        
Stockholders Equity [Line Items]        
Number of shares of stock options granted     5,000  
2008 Plan [Member] | 2014 Stock Options [Member]        
Stockholders Equity [Line Items]        
Number of shares of stock options granted       489,000
Options vest at a percentage rate for first 5 years     16.50%  
Options final year vesting   End of the sixth year    
2008 Plan [Member] | 2014 Stock Options [Member] | Discontinued Operations [Member]        
Stockholders Equity [Line Items]        
Number of shares of stock options granted       119,000