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STOCKHOLDERS' EQUITY - Summary of Restricted Stock, Restricted Stock Unit and Performance Stock Unit Activity (Detail)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
$ / shares
shares
Restricted Stock, Restricted Stock Units and Performance Stock Units  
Restricted Stock, Restricted Stock Units, and Performance Stock Units  
Outstanding, beginning balance (in shares) 393,000
Granted (in shares) 162,000
Vested (in shares) (240,000)
Forfeited or canceled (in shares) (8,000)
Outstanding, ending balance (in shares) 307,000
Unvested, ending balance (in shares) 509,000
Weighted Average Grant Price  
Outstanding, beginning balance (in dollars per share) | $ / shares $ 28.23
Granted (in dollars per share) | $ / shares 47.86
Vested (in dollars per share) | $ / shares 24.17
Forfeited or canceled (in dollars per share) | $ / shares 36.05
Outstanding, ending balance (in dollars per share) | $ / shares 41.55
Weighted average grant price, unvested, ending balance (in dollars per share) | $ / shares $ 42.77
Weighted average remaining contractual term, outstanding 1 year 8 months 12 days
Weighted average remaining contractual term, unvested 1 year 7 months 6 days
Aggregate intrinsic value, outstanding | $ $ 19,009
Aggregate intrinsic value, unvested | $ $ 31,527
Performance Stock Units  
Weighted Average Grant Price  
Attainment level percentage 100.00%
Class A Common Stock | Performance Stock Units  
Weighted Average Grant Price  
Additional issuance if performance targets met (in shares) 202,000
Additional shares issued 87,000