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, 2021	Dec. 31, 2020
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	$ 45,736	$ 76,223
12 Months or more Fair Value	3,032	2,968
Total Fair Value	48,768	79,191
Less than 12 months Unrealized Losses	7,184	10,861
12 Months or more Unrealized Losses	5	59
Total Unrealized Losses	7,189	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	1,294	600
12 Months or more Fair Value	82
Total Fair Value	1,376	600
Less than 12 months Unrealized Losses	13	9
12 Months or more Unrealized Losses	1
Total Unrealized Losses	14	9
Mutual funds - equity securities
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	373	288
12 Months or more Fair Value	1
Total Fair Value	374	288
Less than 12 months Unrealized Losses	28	7
12 Months or more Unrealized Losses	3
Total Unrealized Losses	31	7
Other investment funds
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	43,262	74,885
Total Fair Value	43,262	74,885
Less than 12 months Unrealized Losses	7,064	10,813
Total Unrealized Losses	7,064	10,813
Equity securities
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	807	45
12 Months or more Fair Value		19
Total Fair Value	807	64
Less than 12 months Unrealized Losses	79	4
12 Months or more Unrealized Losses		15
Total Unrealized Losses	$ 79	$ 19