MERCHANDISE TRUSTS - Contractual Maturities of Debt Securities Held in Merchandise Trusts (Detail) - Variable Interest Entity, Primary Beneficiary - Merchandise Trusts - Fixed maturities - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Investments Classified by Contractual Maturity Date [Line Items]
Less than 1 year	$ 21,875	$ 18,392
1 year through 5 years	8,802	8,476
U.S. governmental securities
Investments Classified by Contractual Maturity Date [Line Items]
1 year through 5 years	1	1
Corporate debt securities
Investments Classified by Contractual Maturity Date [Line Items]
1 year through 5 years	3,576	3,456
Other Debt Securities
Investments Classified by Contractual Maturity Date [Line Items]
Less than 1 year	21,875	18,392
1 year through 5 years	$ 5,225	$ 5,019