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Equity-Based Compensation, Profit Sharing and Deferred Compensation Plans - Summary of Equity-Based Compensation Plans with Grants Outstanding (Detail) - shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common stock, shares authorized 60,000,000 60,000,000
2000 Broadly-Based Stock Option Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares Authorized 2,000,000  
Options/RSUs Outstanding 63,000  
Shares Available to Issue 0  
2010 Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares Authorized 700,000  
Options/RSUs Outstanding 160,000  
Shares Available to Issue 26,000  
Granted (Shares) 6,000  
2014 Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares Authorized 950,000  
Options/RSUs Outstanding 701,000  
Shares Available to Issue 102,000  
Granted (Shares) 193,000  
2018 Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares Authorized 275,000  
Options/RSUs Outstanding 146,000  
Shares Available to Issue 129,000  
Granted (Shares) 146,000  
RSUs    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options issued under the plan (in Shares) 16,000  
RSUs | 2010 Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares Authorized 240,000  
Common stock, shares authorized 22,000  
RSUs | 2018 Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common stock, shares authorized 40,000  
Employee Service Only Stock Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted (Shares) 172,000  
Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options issued under the plan (in Shares) 345,000  
Granted (Shares) 345,000  
Options | 2010 Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted (Shares) 6,000  
Options | 2014 Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted (Shares) 93,000  
Options | 2018 Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted (Shares) 73,000  
Employee Performance Based Stock Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted (Shares) 173,000  
Employee Performance Based Stock Option [Member] | 2010 Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted (Shares) 0  
Employee Performance Based Stock Option [Member] | 2014 Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted (Shares) 100,000  
Employee Performance Based Stock Option [Member] | 2018 Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted (Shares) 73,000  
Option Grant Solely Contingent upon Continued Employment or Continued Service as a Director | RSUs    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted share units vesting period or option vesting period 2 years  
Percentage of options vesting rights 50.00%  
Option Grant Solely Contingent upon Continued Employment or Continued Service as a Director | Performance Based Restricted Stock Unit [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted share units vesting period or option vesting period 2 years  
Percentage of options vesting rights 50.00%  
Option Grant Solely Contingent upon Continued Employment or Continued Service as a Director | Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted (Shares) 34,000  
Restricted share units vesting period or option vesting period 2 years  
Percentage of options vesting rights 50.00%  
Option Grant Solely Contingent upon Continued Employment or Continued Service as a Director | Employee Performance Based Stock Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted (Shares) 34,000  
Restricted share units vesting period or option vesting period 2 years  
Percentage of options vesting rights 50.00%  
Option Grant Contingent upon Continued Employment or Service as a Director and Achievement of Performance Metric | Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted (Shares) 138,000  
Restricted share units vesting period or option vesting period 4 years  
Percentage of options vesting rights 25.00%  
Option Grant Contingent upon Continued Employment or Service as a Director and Achievement of Performance Metric | Employee Performance Based Stock Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted (Shares) 139,000  
Restricted share units vesting period or option vesting period 4 years  
Percentage of options vesting rights 25.00%  
Share-based Compensation Award, Tranche Three [Member] | Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Percentage of options vesting rights 50.00%  
Share-based Compensation Award, Tranche Three [Member] | Employee Performance Based Stock Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Percentage of options vesting rights 50.00%  
Options Granted in Current Year | Option Grant Solely Contingent upon Continued Employment or Continued Service as a Director | Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Option vesting rights over two years in 50% increments on December 31, 2020 and 2021  
Options Granted in Current Year | Option Grant Solely Contingent upon Continued Employment or Continued Service as a Director | Employee Performance Based Stock Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Option vesting rights over two years in 50% increments on December 31, 2020 and 2021  
Options Granted in Current Year | Option Grant Contingent upon Continued Employment or Service as a Director and Achievement of Performance Metric | Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Option vesting rights over four years in 25% increments on December 31, 2020, 2021, 2022, and 2023  
Options Granted in Current Year | Option Grant Contingent upon Continued Employment or Service as a Director and Achievement of Performance Metric | Employee Performance Based Stock Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Option vesting rights over four years in 25% increments on December 31, 2020, 2021, 2022, and 2023  
Options Granted in Current Year | Share-based Compensation Award, Tranche Three [Member] | RSUs    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Option vesting rights over two years in 50% increments on December 31, 2022 and 2023  
Options Granted in Current Year | Share-based Compensation Award, Tranche Three [Member] | Performance Based Restricted Stock Unit [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Option vesting rights over two years in 50% increments on December 31, 2022 and 2023