Loans and finance receivables - Narrative (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aggregated loan balance	$ 22,596,000,000	$ 22,065,000,000
Seritage Growth Properties and Lee Enterprises, Inc. [Member] | Term Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aggregated loan balance	1,900,000,000	$ 1,900,000,000
Seritage Growth Properties [Member] | Term Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loan facility	$ 2,000,000,000.0
Loan expiration date	Jul. 31, 2023
Extended loan maturity date	Jul. 31, 2025
Maximum principal loan balance to extend loan maturity period	$ 800,000,000
Lee Enterprises, Inc. [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan agreements maturity year	2045
Manufactured Housing Loan Balances [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percent of manufactured housing loan balances evaluated collectively for impairment	99.00%
Percent of loan balances considered to be current as to payment status	98.00%
Aggregated loan balance	$ 20,694,000,000