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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 9 Months Ended 12 Months Ended
Jun. 30, 2016
Feb. 29, 2016
Jun. 30, 2015
Mar. 31, 2015
Feb. 28, 2015
Jan. 31, 2015
Feb. 28, 2014
Jan. 31, 2014
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                  
Unrecognized equity-based compensation                 $ 18,456     $ 34,107     $ 18,456 $ 34,107  
Restricted stock                                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                  
Number of shares, granted (in shares)                   112,397 434,283   140,416 441,256      
Number of shares, vested (in shares)                 16,201 81,391 657,317 28,461 63,017 644,247      
Number of shares, forfeited (in shares)                   7,500 588,819 26,125   43,660      
Grant date fair value (in dollars per share)                   $ 9.33 $ 8.44   $ 13.17 $ 16.21      
Restricted stock | Vest on various anniversaries through 2020                                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                  
Number of shares, granted (in shares)                             87,650    
Non-Management Director Compensation Plan (the Director Plan) | Restricted stock                                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                  
Stock awards vesting period                             6 months    
Second Amended and Restated Non-Management Director Compensation Plan (the Amended Director Plan) | Restricted stock                                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                  
Share based compensation expense                 $ 2,200     $ 2,400     $ 6,500 $ 7,100  
Unrecognized equity-based compensation                 2,200           2,200    
Employees and Executive Officers | Restricted stock                                  
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)   344,375     344,375                        
Unrecognized equity-based compensation                 $ 9,900           9,900    
Equity based compensation expected to be recognized remainder of year                             1,700    
Equity based compensation expected to be recognized in 2017                             7,000    
Equity based compensation expected to be recognized in 2018                             $ 1,200    
Non-Management Board of Directors | Restricted stock                                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                  
Number of shares, granted (in shares)           18,200                      
Non-Management Board of Directors | Non-Management Director Compensation Plan (the Director Plan) | Restricted stock                                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                  
Number of shares, granted (in shares)               37,500                  
Non-Management Board of Directors | Second Amended and Restated Non-Management Director Compensation Plan (the Amended Director Plan) | Restricted stock                                  
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)                                 511
Number of shares, forfeited (in shares)                                 514
Grant date fair value (in dollars per share) $ 9.02                                
Non-Management Board of Directors | Second Amended and Restated Non-Management Director Compensation Plan (the Amended Director Plan) | Restricted stock | Vested in 2016                                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                  
Number of shares, granted (in shares)                             86,891    
Non-Management Board of Directors | Second Amended and Restated Non-Management Director Compensation Plan (the Amended Director Plan) | Restricted stock | Vested in equal increments from December 2016 through June 2018                                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                  
Number of shares, granted (in shares)                             52,500    
Executives | Common stock                                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                  
Number of shares awarded (in shares)       20,000                          
Share based compensation expense                           $ 300