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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 6 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
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Unrecognized equity-based compensation $ 25,841   $ 43,891           $ 25,841   $ 43,891   $ 25,841 $ 43,891    
Common Stock                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Number of shares awarded       20,000                        
Share based compensation expense                       $ 300        
Restricted Stock                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Number of shares, granted                 112,397 434,283 140,416 441,256        
Weighted Average Fair Value, Granted (in dollars per share)                 $ 9.33 $ 8.44 $ 13.17 $ 16.21        
Number of shares, vested                 81,391 657,317 63,017 644,247        
Number of shares, forfeited                 7,500 588,819   43,660        
Number of SARs outstanding (in shares) 2,692,481   3,586,023 3,508,624         2,692,481 2,668,975 3,586,023 3,508,624 2,692,481 3,586,023 3,480,828 3,755,275
Restricted Stock | Vest on various anniversaries                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Number of shares, granted                         88,650      
Non-Management Director Compensation 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]                                
Number of shares, granted 72,397   140,416                          
Weighted Average Fair Value, Granted (in dollars per share) $ 9.02                              
Stock awards vesting period 1 year                              
Number of shares, vested                             511  
Share based compensation expense                 $ 2,200   $ 2,400   $ 4,400 $ 4,700    
Number of shares, forfeited                             514  
Unrecognized equity-based compensation $ 4,300               4,300       $ 4,300      
Second Amended and Restated Non-Management Director Compensation Plan (the “Amended Director Plan”) | Restricted Stock | Tranche One                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Number of shares, granted                         79,391      
Second Amended and Restated Non-Management Director Compensation Plan (the “Amended Director Plan”) | Restricted Stock | Tranche Two                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Number of shares, granted     60,000                          
Board of Directors | Non-Management Director Compensation Plan | Restricted Stock                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Number of shares, granted               37,500                
Employees and Executive Officers | Restricted Stock                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Number of shares, granted             1,377,500                  
Stock awards vesting period             4 years                  
Number of shares, vested   344,375     344,375                      
Unrecognized equity-based compensation $ 11,700               $ 11,700       $ 11,700      
Equity based compensation expected to be recognized remainder of year                         3,500      
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           18,200                    
Employees | Restricted Stock                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Number of shares, granted                         7,701