Investments in and Advances to Unconsolidated Affiliates - Mervyns I & II - Additional Information (Details) - USD ($) $ in Thousands, shares in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Sep. 30, 2020
Schedule of Equity Method Investments [Line Items]
Cost method investments effective ownership interest						1.00%
Net unrealized holding gains on investments			$ 51,925	$ 72,391	$ 0
Mervyns II
Schedule of Equity Method Investments [Line Items]
Cost method investment, ownership percentage			28.33%
Proceeds from Dividends Received			$ 1,700
Unrealized change in fair value of investment			$ 51,900
Realized gain on investment	$ 400	$ 22,800
Cost method investments effective ownership, shares			4.1			4.1
Cost method investments effective ownership interest			1.00%
Net unrealized holding gains on investments		$ 64,900
Albertson
Schedule of Equity Method Investments [Line Items]
Cost method investment, ownership percentage			36.67%
Net unrealized holding gains on investments				$ 7,500
Albertson | Mervyns II
Schedule of Equity Method Investments [Line Items]
Net unrealized holding gains on investments			$ 1,700