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Equity-Based Compensation - SARs Outstanding (Detail) - SARs - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 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) 306,575 306,575 306,575 307,514 482,657 504,656 479,656 479,656
Number of SARs exercisable (in shares) 287,219       456,082      
Aggregate Intrinsic Value of SARs Outstanding as of September 30, 2017 $ 1,236       $ 1,100      
$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) 11 months 23 days              
Aggregate Intrinsic Value of SARs Outstanding as of September 30, 2017 $ 206              
$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              
Aggregate Intrinsic Value of SARs Outstanding as of September 30, 2017 $ 270              
$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) 232,394              
Weighted Average Remaining Contractual Life of SARs Outstanding (in years) 3 years 6 months 7 days              
Aggregate Intrinsic Value of SARs Outstanding as of September 30, 2017 $ 760