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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
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Investments Classified by Contractual Maturity Date [Line Items]      
Less than 1 year $ 199 $ 213 $ 68
1 year through 5 years 4,051 624 1,010
6 years through 10 years 2,215 209 163
More than 10 years 13 13 16
U.S. governmental securities      
Investments Classified by Contractual Maturity Date [Line Items]      
Less than 1 year 112 112  
1 year through 5 years 81 78 137
6 years through 10 years 208 193 108
More than 10 years 13 13  
Corporate debt securities      
Investments Classified by Contractual Maturity Date [Line Items]      
Less than 1 year 87 101 68
1 year through 5 years 3,970 546 873
6 years through 10 years $ 2,007 $ 16 55
More than 10 years     $ 16