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STOCKHOLDERS' EQUITY - Summary of Restricted Stock, Restricted Stock Unit and Performance-based Stock Unit Activity (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
$ / shares
shares
Restricted Stock, Restricted Stock Units And Performance Stock Units  
Restricted Stock, Restricted Stock Units, and Performance Stock Units  
Outstanding, beginning of period (in shares) 307
Granted (in shares) 88
Forfeited (in shares) 0
Outstanding, end of period (in shares) 327
Weighted Average Grant Date Fair Value  
Outstanding at beginning of period (in dollars per share) | $ / shares $ 41.55
Granted (in dollars per share) | $ / shares 67.48
Forfeited (in dollars per share) | $ / shares 56.04
Outstanding at end of period (in dollars per share) | $ / shares $ 50.37
Weighted Average Remaining Contractual Term (years) and Aggregate Intrinsic Value  
Contractual term 2 years 1 month 6 days
Aggregate intrinsic value | $ $ 20,750
Restricted Stock, Restricted Stock Units And Performance Stock Units | Class A Common Stock  
Restricted Stock, Restricted Stock Units, and Performance Stock Units  
Class A Common Stock Vested (in shares) (68)
Weighted Average Grant Date Fair Value  
Class A Common Stock Vested (in dollars per share) | $ / shares $ 32.69
Performance Stock Unit  
Weighted Average Remaining Contractual Term (years) and Aggregate Intrinsic Value  
Percentage of attainment level 100.00%
Performance Stock Unit | Class A Common Stock  
Weighted Average Remaining Contractual Term (years) and Aggregate Intrinsic Value  
Number of additional shares 268
Unvested | Restricted Stock, Restricted Stock Units And Performance Stock Units  
Restricted Stock, Restricted Stock Units, and Performance Stock Units  
Outstanding, end of period (in shares) 595
Weighted Average Grant Date Fair Value  
Outstanding at end of period (in dollars per share) | $ / shares $ 50.59
Weighted Average Remaining Contractual Term (years) and Aggregate Intrinsic Value  
Contractual term 1 year 10 months 24 days
Aggregate intrinsic value | $ $ 37,816