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STOCK INCENTIVE PLANS - Restricted Stock Units Activity (Detail) - $ / shares
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Shares, granted (in shares) 1,182,197 958,720
Shares, unvested units outstanding at end of period (in shares) 2,838,648  
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) 2,556,174 1,975,862
Shares, granted (in shares) 1,182,197 958,720
Shares, vested (in shares) (655,208) (257,712)
Shares, forfeited/expired (in shares) (325,253) (209,438)
Shares, dividend reinvestment (in shares) 80,738 60,938
Shares, unvested units outstanding at end of period (in shares) 2,838,648 2,528,370
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) $ 13.51 $ 13.64
Weighted average grant price, granted (in USD per share) 10.94 13.21
Weighted average grant price, vested (in USD per share) 13.15 13.18
Weighted average grant price, forfeited/expired (in USD per share) 12.72 13.36
Weighted average grant price, dividend reinvestment (in USD per share) 11.62 13.72
Weighted average grant price, invested units outstanding at end of period (in USD per share) $ 12.54 $ 13.55