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STOCK INCENTIVE PLANS - Restricted Stock Units Activity (Detail) - $ / shares
9 Months Ended
Sep. 30, 2020
Sep. 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) 4,322,378  
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) 2,004,895 1,182,197
Net adjustment due to performance (in shares) 47,290 0
Shares, vested (in shares) (592,602) (655,208)
Shares, forfeited/expired (in shares) (169,552) (325,253)
Shares, dividend reinvestment (in shares) 173,990 80,738
Shares, unvested units outstanding at end of period (in shares) 4,322,378 2,838,648
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) 5.95 10.94
Weighted average grant price, net adjusted due to performance (in USD per share) 13.00 0
Weighted average grant price, vested (in USD per share) 14.50 13.15
Weighted average grant price, forfeited/expired (in USD per share) 13.05 12.72
Weighted average grant price, dividend reinvestment (in USD per share) 6.99 11.62
Weighted average grant price, invested units outstanding at end of period (in USD per share) $ 9.45 $ 12.54