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Equity-Based Compensation - SARs Outstanding (Detail) - SARs - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Number of SARs outstanding (in shares) 306,575 307,514 479,656 479,656
Number of SARs exercisable (in shares) 280,563   465,961  
Aggregate intrinsic value of SARs outstanding as of March 31, 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 5 months 18 days      
Aggregate intrinsic value of SARs outstanding as of March 31, 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) 18,625      
Weighted average remaining contractual life of SARs outstanding (in years) 7 years 6 months      
Aggregate intrinsic value of SARs outstanding as of March 31, 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) 231,988      
Weighted average remaining contractual life of SARs outstanding (in years) 4 years 7 days      
Aggregate intrinsic value of SARs outstanding as of March 31, 2017 $ 475