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STOCKHOLDERS EQUITY - Additional Information (Detail) $ / shares in Units, $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Feb. 12, 2019 shares | Dec. 31, 2020 USD ($) vote $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 | Nov. 30, 2014 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted-average remaining contractual term of unexercised stock options |  | 6 years 8 months 26 days | 7 years 2 months 26 days | 7 years 8 months 1 day |
Class A |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common stock, shares authorized (in shares) |  | 59,779,750 | 59,779,750 |  |
Common stock, par value (in dollars per share) | $ / shares |  | $ 0.01 | $ 0.01 |  |
Common Stock, number of votes per share | vote |  | 1 |  |  |
Common stock, shares issued (in shares) |  | 7,953,729 | 7,849,756 |  |
Common stock, shares outstanding (in shares) |  | 7,868,159 | 7,764,186 |  |
Class A | November 2014 New Share Repurchase Program |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Remaining common stock available for repurchase under share repurchase program (in shares) |  | 404,000 | 404,000 |  |
Class A | Maximum | November 2014 New Share Repurchase Program |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
New share repurchase program, shares authorized to repurchase (in shares) |  |  |  |  | 429,000
Class B |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common stock, shares authorized (in shares) |  | 220,250 | 220,250 |  |
Common stock, par value (in dollars per share) | $ / shares |  | $ 0.01 | $ 0.01 |  |
Common Stock, number of votes per share | vote |  | 15 |  |  |
Common stock, shares issued (in shares) |  | 220,250 | 220,250 |  |
Common stock, shares outstanding (in shares) |  | 220,250 | 220,250 |  |
Series C Preferred Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  | $ 0.01 | $ 0.01 |  |
Preferred stock, shares authorized (in shares) |  | 20,000,000 | 20,000,000 |  |
Preferred stock, shares issued (in shares) |  | 3,440,690 | 3,440,690 |  |
Preferred stock, shares outstanding (in shares) |  | 3,440,690 | 3,440,690 |  |
Preferred stock, redemption price (in dollars per share) | $ / shares |  | $ 5.00 |  |  |
2019 Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted-average remaining contractual term of unexercised stock options |  | 5 years 1 month 6 days | 4 years 6 months |  |
Unrecognized compensation cost related to nonvested stock issuances | $ |  | $ 1.1 | $ 0.6 |  |
2019 Plan | Class A |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares authorized | 2,500,000 |  |  |  |
Shares available for issuance under omnibus incentive plan |  | 2,100,000 | 2,100,000 |  |
2019 Plan | Stock options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period | 4 years |  |  |  |
Omnibus incentive plan stock option expiration period | 10 years |  |  |  |
2004 Long-Term Compensation Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation cost related to nonvested stock issuances | $ |  | $ 1.1 | $ 0.6 |  |

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