MERCHANDISE TRUSTS - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2021 USD ($) Security	Dec. 31, 2020 USD ($) Security
West Virginia Trust Receivable
Schedule Of Available For Sale Securities [Line Items]
Trust assets, fair value	$ 10,300,000	$ 10,000,000.0
Merchandise Trusts
Schedule Of Available For Sale Securities [Line Items]
Percentage of VIE for cancellable state	47.80%
Impairments	$ 0	0
Merchandise Trusts | Variable Interest Entity, Primary Beneficiary
Schedule Of Available For Sale Securities [Line Items]
Trust assets, fair value	567,853,000	516,284,000
Purchases of available for sale securities	77,600,000	52,900,000
Sales, maturities and paydowns of available for sale securities	42,100,000	56,400,000
Other than temporary impairments loss	$ 136,000	$ 26,714,000
Merchandise Trusts | Variable Interest Entity, Primary Beneficiary | Other Than Temporarily Impaired Securities
Schedule Of Available For Sale Securities [Line Items]
Number of securities that incurred other than temporary impairment losses | Security	6	57
Trust assets, cost	$ 300,000	$ 106,400,000
Trust assets, fair value	200,000	79,700,000
Other than temporary impairments loss	100,000	26,700,000
Merchandise Trusts | West Virginia Trust Receivable | Variable Interest Entity, Primary Beneficiary
Schedule Of Available For Sale Securities [Line Items]
Trust assets, fair value	$ 10,292,000	$ 9,969,000