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MERCHANDISE TRUSTS - Cost and Market Value Associated with Assets Held in Merchandise Trusts (Parenthetical) (Detail) - Merchandise Trusts - Variable Interest Entity, Primary Beneficiary
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
Extension
Dec. 31, 2020
USD ($)
Extension
Schedule Of Available For Sale Securities [Line Items]    
Number of potential lockup period extensions | Extension 3 3
Lockup extension period 1 year 1 year
Unfunded investment commitments to private credit funds, callable at any time | $ $ 74.6 $ 47.8
Minimum    
Schedule Of Available For Sale Securities [Line Items]    
Fixed income funds and equity funds, redemption period 1 day 1 day
Private credit funds, lockup periods 0 years 1 year
Maximum    
Schedule Of Available For Sale Securities [Line Items]    
Fixed income funds and equity funds, redemption period 30 days 30 days
Private credit funds, lockup periods 10 years 5 years