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Equity-Based Compensation Equity-Based Compensation - SARs Outstanding (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Number of SARs outstanding (in shares) 479,656      
Number of SARs exercisable (in shares) 465,961      
Aggregate intrinsic value of SARs outstanding as of March 31, 2016 $ 75   $ 4,200  
SARs        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Number of SARs outstanding (in shares) 479,656 479,656 542,085 548,482
Number of SARs exercisable (in shares) 465,961   460,911  
$6.70 - $8.76 | SARs        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Number of SARs outstanding (in shares) 68,264      
Number of SARs exercisable (in shares) 68,264      
Weighted average remaining contractual life of SARs outstanding (in years) 2 years 11 months 5 days      
Aggregate intrinsic value of SARs outstanding as of March 31, 2016 $ 75      
Grant Price, lower range limit $ 6,700      
Grant Price, upper range limit $ 8,760      
$9.25 - $9.84 | SARs        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Number of SARs outstanding (in shares) 144,095      
Number of SARs exercisable (in shares) 132,537      
Weighted average remaining contractual life of SARs outstanding (in years) 6 years 2 months 16 days      
Aggregate intrinsic value of SARs outstanding as of March 31, 2016 $ 0      
Grant Price, lower range limit $ 9,250      
Grant Price, upper range limit $ 9,840      
$11.69 - $17.31 | SARs        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Number of SARs outstanding (in shares) 267,297      
Number of SARs exercisable (in shares) 265,160      
Weighted average remaining contractual life of SARs outstanding (in years) 4 years 10 months 6 days      
Aggregate intrinsic value of SARs outstanding as of March 31, 2016 $ 0      
Grant Price, lower range limit $ 11,690      
Grant Price, upper range limit $ 17,310