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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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