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MERCHANDISE TRUSTS - Contractual Maturities of Debt Securities Held in Merchandise Trusts (Detail) - Variable Interest Entity, Primary Beneficiary - Merchandise Trusts - Fixed maturities - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Investments Classified by Contractual Maturity Date [Line Items]    
Less than 1 year $ 18,392 $ 213
1 year through 5 years 8,476 624
6 years through 10 years   209
More than 10 years   13
U.S. governmental securities    
Investments Classified by Contractual Maturity Date [Line Items]    
Less than 1 year   112
1 year through 5 years 1 78
6 years through 10 years   193
More than 10 years   13
Corporate debt securities    
Investments Classified by Contractual Maturity Date [Line Items]    
Less than 1 year   101
1 year through 5 years 3,456 546
6 years through 10 years   $ 16
Other Debt Securities    
Investments Classified by Contractual Maturity Date [Line Items]    
Less than 1 year 18,392  
1 year through 5 years $ 5,019