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, 2019	Dec. 31, 2018
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Unrealized Losses	$ 2,993	$ 9,819
12 Months or more Unrealized Losses	168	1,333
Total Unrealized Losses	3,161	11,152
Less than 12 months Fair Value	55,314	216,168
12 Months or more Fair Value	821	3,374
Total Fair Value	56,135	219,542
Fixed maturities
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Unrealized Losses	30	2
12 Months or more Unrealized Losses	168	473
Total Unrealized Losses	198	475
Less than 12 months Fair Value	288	103
12 Months or more Fair Value	821	792
Total Fair Value	1,109	895
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	147
Total Unrealized Losses	65	147
Less than 12 months Fair Value	90
12 Months or more Fair Value	397	243
Total Fair Value	487	243
Fixed maturities | Corporate debt securities
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Unrealized Losses	29	2
12 Months or more Unrealized Losses	104	326
Total Unrealized Losses	133	328
Less than 12 months Fair Value	198	103
12 Months or more Fair Value	424	549
Total Fair Value	622	652
Mutual funds - debt securities
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Unrealized Losses	6	2,011
12 Months or more Unrealized Losses		634
Total Unrealized Losses	6	2,645
Less than 12 months Fair Value	241	46,005
12 Months or more Fair Value		1,195
Total Fair Value	241	47,200
Mutual funds - equity securities
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Unrealized Losses		18
Total Unrealized Losses		18
Less than 12 months Fair Value		131
Total Fair Value		131
Other investment funds
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Unrealized Losses	2,953	7,784
Total Unrealized Losses	2,953	7,784
Less than 12 months Fair Value	54,782	169,929
Total Fair Value	54,782	169,929
Equity securities
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Unrealized Losses	4
12 Months or more Unrealized Losses		213
Total Unrealized Losses	4	213
Less than 12 months Fair Value	3
12 Months or more Fair Value		597
Total Fair Value	$ 3	597
Other invested assets
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Unrealized Losses		4
12 Months or more Unrealized Losses		13
Total Unrealized Losses		17
12 Months or more Fair Value		790
Total Fair Value		$ 790