MERCHANDISE TRUSTS - Aging of Unrealized Losses on Investments in Fixed Maturities and Equity Securities Held in Merchandise Trusts (Detail) - Variable Interest Entity, Primary Beneficiary - Merchandise Trusts - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Unrealized Losses	$ 10,317	$ 2,993
12 Months or more Unrealized Losses		168
Total Unrealized Losses	10,317	3,161
Less than 12 months Fair Value	94,401	55,314
12 Months or more Fair Value		821
Total Fair Value	94,401	56,135
Fixed maturities
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Unrealized Losses	1,332	30
12 Months or more Unrealized Losses		168
Total Unrealized Losses	1,332	198
Less than 12 months Fair Value	18,392	288
12 Months or more Fair Value		821
Total Fair Value	18,392	1,109
Fixed maturities | U.S. governmental securities
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Unrealized Losses		1
12 Months or more Unrealized Losses		64
Total Unrealized Losses		65
Less than 12 months Fair Value		90
12 Months or more Fair Value		397
Total Fair Value		487
Fixed maturities | Corporate debt securities
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Unrealized Losses		29
12 Months or more Unrealized Losses		104
Total Unrealized Losses		133
Less than 12 months Fair Value		198
12 Months or more Fair Value		424
Total Fair Value		622
Fixed maturities | Other Debt Securities
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Unrealized Losses	1,332
Total Unrealized Losses	1,332
Less than 12 months Fair Value	18,392
Total Fair Value	18,392
Mutual funds - debt securities
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Unrealized Losses		6
Total Unrealized Losses		6
Less than 12 months Fair Value		241
Total Fair Value		241
Mutual funds - equity securities
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Unrealized Losses	154
Total Unrealized Losses	154
Less than 12 months Fair Value	128
Total Fair Value	128
Other investment funds
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Unrealized Losses	8,812	2,953
Total Unrealized Losses	8,812	2,953
Less than 12 months Fair Value	75,799	54,782
Total Fair Value	75,799	54,782
Equity securities
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Unrealized Losses	19	4
Total Unrealized Losses	19	4
Less than 12 months Fair Value	82	3
Total Fair Value	$ 82	$ 3