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Equity-Based Compensation - SARs Outstanding (Detail) - SARs - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Number of SARs outstanding (in shares) 306,575 306,575 307,514 504,656 479,656 479,656
Number of SARs exercisable (in shares) 287,094     477,791    
Aggregate Intrinsic Value of SARs Outstanding as of June 30, 2017 $ 859     $ 100    
$6.70 - $8.76            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Grant Price, lower range limit (in dollars per share) $ 6.70          
Grant Price, upper range limit (in dollars per share) $ 8.76          
Number of SARs outstanding (in shares) 29,950          
Number of SARs exercisable (in shares) 29,950          
Weighted Average Remaining Contractual Life of SARs Outstanding (in years) 1 year 2 months 23 days          
Aggregate Intrinsic Value of SARs Outstanding as of June 30, 2017 $ 169          
$9.02 - $9.25            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Grant Price, lower range limit (in dollars per share) $ 9.02          
Grant Price, upper range limit (in dollars per share) $ 9.25          
Number of SARs outstanding (in shares) 43,625          
Number of SARs exercisable (in shares) 24,875          
Weighted Average Remaining Contractual Life of SARs Outstanding (in years) 7 years 3 months          
Aggregate Intrinsic Value of SARs Outstanding as of June 30, 2017 $ 215          
$11.69 - $17.31            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Grant Price, lower range limit (in dollars per share) $ 11.69          
Grant Price, upper range limit (in dollars per share) $ 17.31          
Number of SARs outstanding (in shares) 233,000          
Number of SARs exercisable (in shares) 232,269          
Weighted Average Remaining Contractual Life of SARs Outstanding (in years) 3 years 9 months 7 days          
Aggregate Intrinsic Value of SARs Outstanding as of June 30, 2017 $ 475