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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Accounts Receivable) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Basis of Presentation and Significant Accounting Policies [Abstract]      
Contractual receivables $ 34,901   $ 43,258
Effective yield interest receivables 12,741   11,673
Straight-line rent receivables - net 251,166   216,054
Lease inducements 49,644 $ 28,000 16,812
Reduction of contingent liability amount 22,000    
Allowance (1,075)   (8,463)
Accounts receivable - net $ 347,377   $ 279,334