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	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Fair Value, Assets held for sale	$ (4,641)	$ (4,518)
Fair Value, Excluding assets held for sale	319,175	312,228
Short-term investments | Level 1
Debt Securities, Available-for-sale [Line Items]
Cost	44,842	21,217
Fair Value	44,842	21,217
Fixed maturities
Debt Securities, Available-for-sale [Line Items]
Cost	839	986
Gross Unrealized Gains	132	96
Gross Unrealized Losses	(1)	(72)
Fair Value	970	1,010
Fixed maturities | Level 2 | U.S. governmental securities
Debt Securities, Available-for-sale [Line Items]
Cost	17	48
Gross Unrealized Gains	3	4
Fair Value	20	52
Fixed maturities | Level 2 | Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Cost	383	505
Gross Unrealized Gains	92	92
Gross Unrealized Losses	(1)	(44)
Fair Value	474	553
Fixed maturities | Level 2 | Other Debt Securities
Debt Securities, Available-for-sale [Line Items]
Cost	439	433
Gross Unrealized Gains	37
Gross Unrealized Losses		(28)
Fair Value	476	405
Mutual funds - debt securities | Level 1
Debt Securities, Available-for-sale [Line Items]
Cost	1,982	2,386
Gross Unrealized Gains	39	62
Gross Unrealized Losses	(16)	(9)
Fair Value	2,005	2,439
Mutual funds - equity securities | Level 1
Debt Securities, Available-for-sale [Line Items]
Cost	9,856	9,240
Gross Unrealized Gains	2,266	1,244
Gross Unrealized Losses	(16)	(7)
Fair Value	12,106	10,477
Other investment funds
Debt Securities, Available-for-sale [Line Items]
Cost	226,686	247,845
Gross Unrealized Gains	19,378	21,952
Gross Unrealized Losses	(8,301)	(10,813)
Fair Value	237,763	258,984
Equity securities | Level 1
Debt Securities, Available-for-sale [Line Items]
Cost	21,749	21,748
Gross Unrealized Gains	4,423	873
Gross Unrealized Losses	(52)	(19)
Fair Value	26,120	22,602
Other invested assets | Level 2
Debt Securities, Available-for-sale [Line Items]
Cost	9	16
Gross Unrealized Gains	1	1
Fair Value	10	17
Total Investments
Debt Securities, Available-for-sale [Line Items]
Cost	305,963	303,438
Gross Unrealized Gains	26,239	24,228
Gross Unrealized Losses	(8,386)	(10,920)
Fair Value	$ 323,816	$ 316,746