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Restricted Stock, Stock Options and Other Stock Plans - Additional Information (Detail) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Feb. 12, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Nov. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted-average remaining contractual term of unexercised stock options |  | 4 years 6 months | 7 years 8 months 12 days |  |
Class A [Member] | November 2014 New Share Repurchase Program [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Remaining common stock available for repurchase under share repurchase program |  | 404,000 | 404,000 |  |
Class A [Member] | Maximum [Member] | November 2014 New Share Repurchase Program [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
New share repurchase program, shares authorized to repurchase |  |  |  |  | 429,000
2019 Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation cost related to nonvested stock issuances |  | $ 625 | $ 321 |  |
2019 Plan [Member] | Class A [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares authorized | 2,500,000 |  |  |  |
Description of additional shares authorized for issuance under omnibus incentive plan |  | The 2019 Plan authorized 2.5 million shares of our Class A Common Stock subject to adjustment for forfeitures and tax withholdings. |  |  |
Shares available for issuance under omnibus incentive plan |  | 2,100,000 | 60,000 |  |
2019 Plan [Member] | Stock Options [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period | 4 years |  |  |  |
Omnibus incentive plan stock option expiration period | 10 years |  |  |  |
Weighted-average remaining contractual term of unexercised stock options |  | 7 years 2 months 26 days |  |  |
2004 Long-Term Compensation Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation cost related to nonvested stock issuances |  | $ 625 | $ 321 |  |
2004 Long-Term Compensation Plan [Member] | Class A [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares available for issuance under omnibus incentive plan |  | 2,100,000 | 60,000 |  |
2004 Long-Term Compensation Plan [Member] | Stock Options [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted-average remaining contractual term of unexercised stock options |  |  | 7 years 8 months 1 day | 8 years 6 months |

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