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STOCK INCENTIVE PLANS - Restricted Stock Units Activity (Detail) - $ / shares
6 Months Ended
Jun. 30, 2019
Jun. 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) 1,128,701 937,155
Shares, unvested units outstanding at end of period (in shares) 2,781,415  
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) 1,128,701 937,155
Shares, vested (in shares) (649,248) (257,712)
Shares, forfeited/expired (in shares) (305,891) (180,723)
Shares, dividend reinvestment (in shares) 51,679 38,129
Shares, unvested units outstanding at end of period (in shares) 2,781,415 2,512,711
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) 10.95 13.20
Weighted average grant price, vested (in USD per share) 13.15 13.18
Weighted average grant price, forfeited/expired (in USD per share) 12.74 13.30
Weighted average grant price, dividend reinvestment (in USD per share) 11.63 14.02
Weighted average grant price, invested units outstanding at end of period (in USD per share) $ 12.60 $ 13.56