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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
Jun. 30, 2019
Dec. 31, 2018
Investments Classified by Contractual Maturity Date [Line Items]    
Less than 1 year $ 197 $ 68
1 year through 5 years 636 1,010
6 years through 10 years 281 163
More than 10 years 15 16
U.S. governmental securities    
Investments Classified by Contractual Maturity Date [Line Items]    
Less than 1 year 112  
1 year through 5 years 30 137
6 years through 10 years 243 108
More than 10 years 15  
Corporate debt securities    
Investments Classified by Contractual Maturity Date [Line Items]    
Less than 1 year 85 68
1 year through 5 years 606 873
6 years through 10 years $ 38 55
More than 10 years   $ 16