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PERPETUAL CARE TRUSTS - Contractual Maturities of Debt Securities Held in Perpetual Care Trusts (Detail) - Variable Interest Entity, Primary Beneficiary - Perpetual care trusts - Fixed maturities - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Investments Classified by Contractual Maturity Date [Line Items]      
Less than 1 year $ 263 $ 705 $ 708
1 year through 5 years 1,606 4,118 4,543
6 years through 10 years 984 660 501
More than 10 years 119 83 135
U.S. governmental securities      
Investments Classified by Contractual Maturity Date [Line Items]      
Less than 1 year 60    
1 year through 5 years 70 416 263
6 years through 10 years 821 395 163
More than 10 years 119 32 38
Corporate debt securities      
Investments Classified by Contractual Maturity Date [Line Items]      
Less than 1 year 203 705 708
1 year through 5 years 1,536 3,702 4,280
6 years through 10 years $ 163 265 338
More than 10 years   $ 51 $ 97