PERPETUAL CARE TRUSTS - Aging of Unrealized Losses on Investments in Fixed Maturities and Equity Securities Held in Perpetual Care Trusts (Detail) - Variable Interest Entity, Primary Beneficiary - Perpetual care trusts - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	$ 121,680	$ 57,723
12 Months or more Fair Value	2,969	2,829
Total Fair Value	124,649	60,552
Less than 12 months Unrealized Losses	33,383	5,638
12 Months or more Unrealized Losses	600	144
Total Unrealized Losses	33,983	5,782
Fixed maturities
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	917	754
12 Months or more Fair Value	2,949	2,829
Total Fair Value	3,866	3,583
Less than 12 months Unrealized Losses	15	50
12 Months or more Unrealized Losses	192	144
Total Unrealized Losses	207	194
Fixed maturities | U.S. governmental securities
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	119	291
12 Months or more Fair Value	990	942
Total Fair Value	1,109	1,233
Less than 12 months Unrealized Losses		4
12 Months or more Unrealized Losses	50	48
Total Unrealized Losses	50	52
Fixed maturities | Corporate debt securities
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	395	463
12 Months or more Fair Value	1,959	1,887
Total Fair Value	2,354	2,350
Less than 12 months Unrealized Losses	2	46
12 Months or more Unrealized Losses	142	96
Total Unrealized Losses	144	142
Fixed maturities | Other Debt Securities
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	403
Total Fair Value	403
Less than 12 months Unrealized Losses	13
Total Unrealized Losses	13
Mutual funds - debt securities
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	9,643	2,856
12 Months or more Fair Value	2
Total Fair Value	9,645	2,856
Less than 12 months Unrealized Losses	237	38
12 Months or more Unrealized Losses	165
Total Unrealized Losses	402	38
Mutual funds - equity securities
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	5,835	566
12 Months or more Fair Value	3
Total Fair Value	5,838	566
Less than 12 months Unrealized Losses	5,135	66
12 Months or more Unrealized Losses	220
Total Unrealized Losses	5,355	66
Other investment funds
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	86,383	53,426
Total Fair Value	86,383	53,426
Less than 12 months Unrealized Losses	12,929	5,472
Total Unrealized Losses	12,929	5,472
Equity securities
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	18,902	121
12 Months or more Fair Value	15
Total Fair Value	18,917	121
Less than 12 months Unrealized Losses	15,067	12
12 Months or more Unrealized Losses	23
Total Unrealized Losses	$ 15,090	$ 12