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STOCK-BASED COMPENSATION (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Number of Shares/Omega OP Units      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance 2,683,127    
Weighted - Average Grant-Date Fair Value per Share      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Ending Balance $ 14.79    
Total Compensation Cost $ 39,700    
Restricted Stock And Restricted Stock Units Rsu [Member]      
Number of Shares/Omega OP Units      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Beginning Balance 337,509 336,053 413,628
Granted 217,717 185,004 158,506
Cancelled (5,941) (1,000) (905)
Vested (190,412) (182,548) (235,176)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance 358,873 337,509 336,053
Weighted - Average Grant-Date Fair Value per Share      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Beginning Balance $ 32.78 $ 37.32 $ 34.45
Granted 28.19 31.25 34.49
Cancelled 30.82 34.78 24.92
Vested 33.89 39.58 30.41
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Ending Balance $ 29.44 $ 32.78 $ 37.32
Total Compensation Cost $ 6,100 $ 5,800 $ 5,500