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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Common Stock and Convertible Stock Dilutive in Weighted average unearned PSUs outstanding (Detail) - $ / shares
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Accounting Policies [Abstract]        
Weighted average PSUs 1,192 976 1,165 951
Weighted average grant date fair value per unit (in dollars per share) $ 9.21 $ 9.33 $ 9.21 $ 9.33