Annual report pursuant to Section 13 and 15(d)

Equity-Based Compensation - Additional Information (Detail)

v3.19.3.a.u2
Equity-Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
May 31, 2019
Oct. 31, 2018
May 31, 2016
Aug. 31, 2015
Dec. 31, 2019
Dec. 31, 2018
Nov. 02, 2012
Non-Qualified Stock Options              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Restricted stock units granted 60,742 105,398          
Restricted stock units\non-qualified stock options, granted description   One third of the NQOs will vest and settle on each of the first, second and third anniversaries of the grant date.     One third of the NQOs will vest and become exercisable on each of the first, second and third anniversaries of the grant date.    
Fair value assumptions, strike price $ 14.54 $ 13.97          
Fair value assumptions, risk free rate 2.32% 2.94%          
Fair value assumptions, expiration 5 years 5 years          
Fair value assumptions, volatility 34.20% 32.70%          
Compensation expense forfeiture rate 1.00% 1.00%          
Compensation expense         $ 2,272 $ 3,275  
Unrecognized compensation expense related to unvested awards         $ 945 $ 2,392  
Recognition period of unrecognized compensation expense related to unvested awards         1 year 7 months 13 days 1 year 6 months 3 days  
Restricted Stock Units              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Compensation expense         $ 2,272 $ 3,275  
Unrecognized compensation expense related to unvested awards         $ 945 $ 2,392  
Recognition period of unrecognized compensation expense related to unvested awards         1 year 7 months 13 days 1 year 6 months 3 days  
Deferred Equity Units              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Compensation expense         $ 2,272 $ 3,275  
2012 Equity Incentive Plan              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Shares reserved for issuance         489,549 584,679  
Shares reserved for issuance, authorized             1,687,500
Restricted stock units granted     3,791 966,510      
Fair Value per unit     $ 13.19 $ 13.23      
Restricted stock units\non-qualified stock options, granted description         Twenty-five percent of the RSUs granted vest and settle on each of the first, second, third and fourth anniversaries of the grant date.    
2012 Equity Incentive Plan | Employee              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Restricted stock units granted 34,388   7,582        
Fair Value per unit $ 14.54   $ 13.19        
Restricted stock units\non-qualified stock options, granted description         Twenty-five percent of the RSUs granted vest and settle on each of the first, second, third and fourth anniversaries of the grant date.    
2012 Equity Incentive Plan | Board of Directors              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Restricted stock units granted     3,000        
Fair Value per unit     $ 13.19        
Restricted stock units\non-qualified stock options, granted description         One hundred percent of the RSUs granted vest and settle on the first anniversary of the grant date.    
2012 Equity Incentive Plan | First Anniversary              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Restricted stock, vesting percentage     25.00% 25.00%      
2012 Equity Incentive Plan | First Anniversary | Employee              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Restricted stock, vesting percentage 25.00%   25.00%        
2012 Equity Incentive Plan | First Anniversary | Board of Directors              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Restricted stock, vesting percentage     100.00%        
2012 Equity Incentive Plan | Second Anniversary              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Restricted stock, vesting percentage     25.00% 25.00%      
2012 Equity Incentive Plan | Second Anniversary | Employee              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Restricted stock, vesting percentage 25.00%   25.00%        
2012 Equity Incentive Plan | Third Anniversary              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Restricted stock, vesting percentage     25.00% 25.00%      
2012 Equity Incentive Plan | Third Anniversary | Employee              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Restricted stock, vesting percentage 25.00%   25.00%        
2012 Equity Incentive Plan | Fourth Anniversary              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Restricted stock, vesting percentage     25.00% 25.00%      
2012 Equity Incentive Plan | Fourth Anniversary | Employee              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Restricted stock, vesting percentage 25.00%   25.00%