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, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Cost, Assets held for sale	$ (7,923)	$ (2,416)
Gross Unrealized Gains, Assets held for sale		(54)
Gross Unrealized Losses,Assets held for sale	985
Fair Value, Assets held for sale	(6,938)	(2,470)
Cost, Excluding assets held for sale	312,729	334,486
Gross Unrealized Gains, Excluding assets held for sale	21,007	14,915
Gross Unrealized Losses, Excluding assets held for sale	(32,998)	(5,782)
Fair Value, Excluding assets held for sale	300,738	343,619
Short-term investments | Level 1
Debt Securities, Available-for-sale [Line Items]
Cost	9,500	50,358
Fair Value	9,500	50,358
Fixed maturities
Debt Securities, Available-for-sale [Line Items]
Cost	4,557	3,089
Gross Unrealized Gains	342	54
Gross Unrealized Losses	(207)	(194)
Fair Value	4,692	2,949
Fixed maturities | Level 2 | U.S. governmental securities
Debt Securities, Available-for-sale [Line Items]
Cost	1,012	1,069
Gross Unrealized Gains	64	32
Gross Unrealized Losses	(50)	(52)
Fair Value	1,026	1,049
Fixed maturities | Level 2 | Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Cost	3,129	2,020
Gross Unrealized Gains	278	22
Gross Unrealized Losses	(144)	(142)
Fair Value	3,263	1,900
Fixed maturities | Level 2 | Other Debt Securities
Debt Securities, Available-for-sale [Line Items]
Cost	416
Gross Unrealized Losses	(13)
Fair Value	403
Mutual funds - debt securities | Level 1
Debt Securities, Available-for-sale [Line Items]
Cost	17,406	49,963
Gross Unrealized Gains	274	1,439
Gross Unrealized Losses	(402)	(38)
Fair Value	17,278	51,364
Mutual funds - equity securities | Level 1
Debt Securities, Available-for-sale [Line Items]
Cost	16,712	16,698
Gross Unrealized Gains	2,012	1,617
Gross Unrealized Losses	(5,355)	(66)
Fair Value	13,369	18,249
Other investment funds
Debt Securities, Available-for-sale [Line Items]
Cost	236,701	186,355
Gross Unrealized Gains	17,637	10,526
Gross Unrealized Losses	(12,929)	(5,472)
Fair Value	241,409	191,409
Equity securities | Level 1
Debt Securities, Available-for-sale [Line Items]
Cost	35,768	30,423
Gross Unrealized Gains	741	1,333
Gross Unrealized Losses	(15,090)	(12)
Fair Value	21,419	31,744
Other invested assets | Level 2
Debt Securities, Available-for-sale [Line Items]
Cost	8	16
Gross Unrealized Gains	1
Fair Value		16
Fair Value	9
Total Investments
Debt Securities, Available-for-sale [Line Items]
Cost	320,652	336,902
Gross Unrealized Gains	21,007	14,969
Gross Unrealized Losses	(33,983)	(5,782)
Fair Value	$ 307,676	$ 346,089