Investments in Other Entities — Gain on Sale (Details) - USD ($)		12 Months Ended
	Apr. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Cash proceeds (excludes proceeds to settle indebtedness owed to APC from UCI)		$ 52,743,000	$ 0	$ 0
Preferred shares in Bright Health, Inc.		37,075,000	896,000
Less: Carrying value of equity method investment on date of sale		(43,292,000)	(28,427,000)
Gain on sale of equity method investment		99,839,000	0	$ 0
Universal Care, Inc.
Schedule of Equity Method Investments [Line Items]
Cash proceeds (excludes proceeds to settle indebtedness owed to APC from UCI)	$ 52,743,000
Beneficial interest in UCI	15,723,000
Less: Carrying value of equity method investment on date of sale	(4,998,000)	$ 0	$ (1,438,000)
Gain on sale of equity method investment	99,647,000
Universal Care, Inc. | Bright | Preferred stock
Schedule of Equity Method Investments [Line Items]
Preferred shares in Bright Health, Inc.	$ 36,179,000