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STOCKHOLDERS' EQUITY - Narrative (Detail) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Limited Partners' Capital Account [Line Items] |  |  |  |
Unrecognized stock-based compensation expense, stock options | $ 0 |  | $ 0 |
Fair value of stock awards vested | 887,000 |  | 5,292,000 |
Stock Options |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |
Stock-based compensation expense | 0 | $ 0 | 0 | $ 0
Aggregate intrinsic value of options exercised | 448,000 |  | 448,000 |
Restricted Stock, Restricted Stock Units And Performance Stock Units |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |
Stock-based compensation expense | 3,044,000 | 1,763,000 | 5,928,000 | 3,277,000
Restricted Stock |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |
Unrecognized stock-based compensation expense | 108,000 |  | $ 108,000 |
Restricted Stock | Non Employee Director |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |
Options, vesting period |  |  | 3 years |
Restricted Stock Unit |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |
Unrecognized stock-based compensation expense | 5,315,000 |  | $ 5,315,000 |
Performance Stock Unit |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |
Unrecognized stock-based compensation expense | 9,006,000 |  | $ 9,006,000 |
Weighted average | Restricted Stock |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |
Unrecognized stock-based compensation, weighted average period |  |  | 2 years 3 months 18 days |
Weighted average | Restricted Stock Unit |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |
Unrecognized stock-based compensation, weighted average period |  |  | 1 year 10 months 24 days |
Weighted average | Performance Stock Unit |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |
Unrecognized stock-based compensation, weighted average period |  |  | 1 year 10 months 24 days |
2016 Plan |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |
Options granted, term |  |  | 10 years |
2016 Plan | Minimum |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |
Options, vesting period |  |  | 1 year |
2016 Plan | Maximum |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |
Options, vesting period |  |  | 4 years |
Amended and Restated 1997 Employee Stock Purchase Plan |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |
Stock-based compensation expense | $ 72,000 | $ 56,000 | $ 128,000 | $ 103,000
Class A Common Stock | 2016 Plan |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |
Common stock, authorized shares | 2,250,000 |  | 2,250,000 |
Number of shares available for future grant | 947,000 |  | 947,000 |
Class A Common Stock | 2006 Incentive Plan |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |
Common stock, additional authorized shares |  |  | 2,723,000 |

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