PERPETUAL CARE TRUSTS - Cost and Market Value Associated with Assets Held in Perpetual Care Trusts (Detail) - Variable Interest Entity, Primary Beneficiary - Perpetual care trusts - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Fair Value, Assets held for sale		$ (4,518)
Fair Value, Excluding assets held for sale		312,228
Short-term investments | Level 1
Debt Securities, Available-for-sale [Line Items]
Cost	$ 22,981	21,217
Fair Value	22,981	21,217
Fixed maturities
Debt Securities, Available-for-sale [Line Items]
Cost	377	986
Gross Unrealized Gains	110	96
Gross Unrealized Losses	(1)	(72)
Fair Value	486	1,010
Fixed maturities | Level 2 | U.S. governmental securities
Debt Securities, Available-for-sale [Line Items]
Cost	14	48
Gross Unrealized Gains	2	4
Fair Value	16	52
Fixed maturities | Level 2 | Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Cost	363	505
Gross Unrealized Gains	108	92
Gross Unrealized Losses	(1)	(44)
Fair Value	470	553
Fixed maturities | Level 2 | Other Debt Securities
Debt Securities, Available-for-sale [Line Items]
Cost		433
Gross Unrealized Losses		(28)
Fair Value		405
Mutual funds - debt securities | Level 1
Debt Securities, Available-for-sale [Line Items]
Cost	2,306	2,386
Gross Unrealized Gains	37	62
Gross Unrealized Losses	(14)	(9)
Fair Value	2,329	2,439
Mutual funds - equity securities | Level 1
Debt Securities, Available-for-sale [Line Items]
Cost	3,902	9,240
Gross Unrealized Gains	1,261	1,244
Gross Unrealized Losses	(31)	(7)
Fair Value	5,132	10,477
Other investment funds
Debt Securities, Available-for-sale [Line Items]
Cost	274,979	247,845
Gross Unrealized Gains	23,113	21,952
Gross Unrealized Losses	(7,064)	(10,813)
Fair Value	291,028	258,984
Equity securities | Level 1
Debt Securities, Available-for-sale [Line Items]
Cost	10,273	21,748
Gross Unrealized Gains	2,915	873
Gross Unrealized Losses	(79)	(19)
Fair Value	13,109	22,602
Other invested assets | Level 2
Debt Securities, Available-for-sale [Line Items]
Cost	9	16
Gross Unrealized Gains	2	1
Fair Value	11	17
Total Investments
Debt Securities, Available-for-sale [Line Items]
Cost	314,827	303,438
Gross Unrealized Gains	27,438	24,228
Gross Unrealized Losses	(7,189)	(10,920)
Fair Value	$ 335,076	$ 316,746