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Equity-Based Compensation - Restricted Stock Award with Service Conditions Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Feb. 28, 2014
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Unrecognized equity-based compensation       $ 18,301 $ 25,202  
Restricted stock            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Number of shares granted (in shares)       286,256 434,283  
Number of shares, vested (in shares)       625,646 657,317  
Number of shares, forfeited (in shares)       167,712 588,819  
Grant date fair value (in dollars per share)       $ 13.85 $ 8.44  
Restricted stock | Vest on various anniversaries through 2021            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Number of shares granted (in shares)       88,200    
Restricted stock | Second Amended and Restated Non-Management Director Compensation Plan (the Amended Director Plan)            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Equity-based compensation expected to be recognized in 2017       $ 6,100    
Share based compensation expense       2,100 $ 2,200  
Unrecognized equity-based compensation       8,100    
Equity-based compensation expected to be recognized in 2018 through 2021       $ 2,000    
Restricted stock | Employees and Executive Officers            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Number of shares granted (in shares)     1,377,500      
Stock awards vesting period     4 years      
Number of shares, vested (in shares)       339,375 344,375  
Number of shares, forfeited (in shares)           10,000
Unrecognized equity-based compensation       $ 6,300    
Equity-based compensation expected to be recognized in 2017       5,200    
Equity-based compensation expected to be recognized in 2018       $ 1,100    
Restricted stock | Non-Management Board of Directors | Second Amended and Restated Non-Management Director Compensation Plan (the Amended Director Plan)            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Number of shares granted (in shares) 72,397 140,416        
Stock awards vesting period 1 year          
Number of shares, vested (in shares)       102,402    
Number of shares, forfeited (in shares)       514    
Grant date fair value (in dollars per share) $ 9.02          
Restricted stock | Non-Management Board of Directors | Second Amended and Restated Non-Management Director Compensation Plan (the Amended Director Plan) | Vested in equal increments from June 2017 through June 2018            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Number of shares granted (in shares)       37,500