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STOCKHOLDERS' EQUITY - Narrative (Detail) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Limited Partners' Capital Account [Line Items] |  |
Fair value of stock awards vested | $ 4,405,000 |
Stock Options |  |
Limited Partners' Capital Account [Line Items] |  |
Stock-based compensation expense | 0 | $ 0
Aggregate intrinsic value of options exercised | 448,000 |
Restricted Stock, Restricted Stock Units And Performance Stock Units |  |
Limited Partners' Capital Account [Line Items] |  |
Stock-based compensation expense | 2,884,000 | 1,515,000
Restricted Stock |  |
Limited Partners' Capital Account [Line Items] |  |
Unrecognized stock-based compensation expense | $ 67,000 |
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 | $ 5,558,000 |
Performance Stock Unit |  |
Limited Partners' Capital Account [Line Items] |  |
Unrecognized stock-based compensation expense | $ 7,933,000 |
Weighted average | Restricted Stock |  |
Limited Partners' Capital Account [Line Items] |  |
Unrecognized stock-based compensation, weighted average period | 2 years 1 month 6 days |
Weighted average | Restricted Stock Unit |  |
Limited Partners' Capital Account [Line Items] |  |
Unrecognized stock-based compensation, weighted average period | 2 years 2 months 12 days |
Weighted average | Performance Stock Unit |  |
Limited Partners' Capital Account [Line Items] |  |
Unrecognized stock-based compensation, weighted average period | 2 years |
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 | $ 57,000 | $ 47,000
Class A Common Stock | 2016 Plan |  |
Limited Partners' Capital Account [Line Items] |  |
Common stock, authorized shares | 2,250,000 |
Number of shares available for future grant | 950,000 |
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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