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Equity-Based Compensation - Restricted Stock Award with Service Conditions Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2014
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Unrecognized equity-based compensation   $ 28,983 $ 42,705      
Number of SARs outstanding (in shares)   479,656        
Restricted Stock            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Number of shares, granted (in shares)   434,283 441,256      
Number of shares, vested   657,317 644,247      
Number of shares, forfeited (in shares)   588,819 43,660      
Number of SARs outstanding (in shares)   2,668,975 3,508,624   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 SARs outstanding (in shares)   16,500        
Non-Management Director Compensation Plan | Restricted Stock            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Stock awards vesting period (in years)   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 (in shares)         140,416  
Number of shares, vested         511  
Number of shares, forfeited (in shares)         514  
Share based compensation expense   $ 2,200 $ 2,700      
Unrecognized equity-based compensation   $ 6,100        
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 (in shares)         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 (in shares)         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 (in shares)       37,500    
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    
Number of shares, vested   344,375 344,375      
Unrecognized Equity-based compensation   $ 13,400        
Equity based compensation expected to be recognized remainder of year   5,200        
Equity based compensation expected to be recognized in 2017   7,000        
Equity based compensation expected to be recognized in 2018   $ 1,200        
Non Management Employees | Restricted Stock            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Number of shares, granted (in shares)   15,000 4,000      
Stock awards vesting period (in years)   4 years        
Number of shares, vested   1,000        
Non Management Employees | Time Based Awards | Restricted Stock            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Number of shares, granted (in shares) 76,200          
Stock awards vesting period (in years) 4 years          
Number of shares, vested   14,325 18,825      
Number of shares, forfeited (in shares)   14,400        
Executives | Restricted Stock            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Number of shares, granted (in shares)     20,000      
Stock awards vesting period (in years)   4 years        
Number of shares, vested   5,000        
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      
Employees | Restricted Stock            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Number of SARs outstanding (in shares)   7,701        
Common Stock            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Number of shares awarded     20,000      
Share based compensation expense     $ 300