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Equity-Based Compensation - SARs Outstanding (Detail) - SARs - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Number of SARs outstanding (in shares) 504,656 479,656 479,656 542,085 542,085 548,482
Number of SARs exercisable (in shares) 477,791     490,722    
Aggregate intrinsic value of SARs outstanding as of June 30, 2016 $ 73     $ 2,000    
$6.70 - $8.76            
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 8 months 5 days          
Aggregate intrinsic value of SARs outstanding as of June 30, 2016 $ 73          
Grant Price, lower range limit (in dollars per share) $ 6.70          
Grant Price, upper range limit (in dollars per share) $ 8.76          
$9.04 - $9.84            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Number of SARs outstanding (in shares) 169,095          
Number of SARs exercisable (in shares) 144,086          
Weighted average remaining contractual life of SARs outstanding (in years) 6 years 6 months 18 days          
Aggregate intrinsic value of SARs outstanding as of June 30, 2016 $ 0          
Grant Price, lower range limit (in dollars per share) $ 9.04          
Grant Price, upper range limit (in dollars per share) $ 9.84          
$11.69 - $17.31            
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) 265,441          
Weighted average remaining contractual life of SARs outstanding (in years) 4 years 7 months 10 days          
Aggregate intrinsic value of SARs outstanding as of June 30, 2016 $ 0          
Grant Price, lower range limit (in dollars per share) $ 11.69          
Grant Price, upper range limit (in dollars per share) $ 17.31