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STOCK INCENTIVE PLANS - Restricted Stock Units Activity (Detail) - $ / shares
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Shares, unvested units outstanding at end of period (in shares) 4,199,443  
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Shares, unvested units outstanding at beginning of period (in shares) 2,858,357 2,556,174
Shares, granted (in shares) 1,988,225 1,128,701
Shares, vested (in shares) (591,880) (649,248)
Shares, forfeited/expired (in shares) (159,760) (305,891)
Shares, dividend reinvestment (in shares) 104,501 51,679
Shares, unvested units outstanding at end of period (in shares) 4,199,443 2,781,415
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]    
Weighted average grant price, invested units outstanding at beginning of period (in USD per share) $ 12.56 $ 13.51
Weighted average grant price, granted (in USD per share) 6.95 10.95
Weighted average grant price, vested (in USD per share) 14.50 13.15
Weighted average grant price, forfeited/expired (in USD per share) 13.36 12.74
Weighted average grant price, dividend reinvestment (in USD per share) 8.02 11.63
Weighted average grant price, invested units outstanding at end of period (in USD per share) $ 9.48 $ 12.60