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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, 2017
Jun. 30, 2016
Jun. 30, 2015
Feb. 28, 2014
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                          
Unrecognized equity-based compensation         $ 5,736     $ 13,421     $ 5,736 $ 13,421  
Restricted stock                          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                          
Number of shares granted (in shares)           54,310 286,256   112,397 434,283      
Number of shares, vested (in shares)         8,500 81,897 625,646 16,201 81,391 657,317      
Number of shares, forfeited (in shares)             167,712   7,500 588,819      
Grant date fair value (in dollars per share)           $ 13.95 $ 13.85   $ 9.33 $ 8.44      
Unrecognized equity-based compensation         $ 5,440     $ 12,790     $ 5,440 12,790  
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)                     85,200    
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                     $ 2,200    
Share based compensation expense         2,200     $ 2,200     6,500 $ 6,500  
Unrecognized equity-based compensation         4,500           4,500    
Equity-based compensation expected to be recognized in 2018 through 2021                     $ 2,300    
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         $ 2,900           $ 2,900    
Equity-based compensation expected to be recognized in 2017                     1,700    
Equity-based compensation expected to be recognized in 2018                     $ 1,200    
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) 54,310 72,397 140,416                    
Stock awards vesting period 1 year 1 year                      
Number of shares, vested (in shares)                     117,402    
Number of shares, forfeited (in shares)                     514    
Grant date fair value (in dollars per share) $ 13.95 $ 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)                     22,500