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	Mar. 31, 2021	Dec. 31, 2020
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	$ 44,455	$ 76,223
12 Months or more Fair Value	2,951	2,968
Total Fair Value	47,406	79,191
Less than 12 months Unrealized Losses	8,385	10,861
12 Months or more Unrealized Losses	1	59
Total Unrealized Losses	8,386	10,920
Fixed maturities
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value		405
12 Months or more Fair Value	2,949	2,949
Total Fair Value	2,949	3,354
Less than 12 months Unrealized Losses		28
12 Months or more Unrealized Losses	1	44
Total Unrealized Losses	1	72
Fixed maturities | U.S. governmental securities
Investments, Unrealized Loss Position [Line Items]
12 Months or more Fair Value	990	990
Total Fair Value	990	990
Fixed maturities | Corporate debt securities
Investments, Unrealized Loss Position [Line Items]
12 Months or more Fair Value	1,959	1,959
Total Fair Value	1,959	1,959
12 Months or more Unrealized Losses	1	44
Total Unrealized Losses	1	44
Fixed maturities | Other Debt Securities
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value		405
Total Fair Value		405
Less than 12 months Unrealized Losses		28
Total Unrealized Losses		28
Mutual funds - debt securities
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	1,055	600
12 Months or more Fair Value	2
Total Fair Value	1,057	600
Less than 12 months Unrealized Losses	16	9
Total Unrealized Losses	16	9
Mutual funds - equity securities
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	583	288
Total Fair Value	583	288
Less than 12 months Unrealized Losses	16	7
Total Unrealized Losses	16	7
Other investment funds
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	42,704	74,885
Total Fair Value	42,704	74,885
Less than 12 months Unrealized Losses	8,301	10,813
Total Unrealized Losses	8,301	10,813
Equity securities
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	113	45
12 Months or more Fair Value		19
Total Fair Value	113	64
Less than 12 months Unrealized Losses	52	4
12 Months or more Unrealized Losses		15
Total Unrealized Losses	$ 52	$ 19