Equity Investments in the Managed Programs and Real Estate - Narratives (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Investments in REITs
Distributions of earnings from equity method investments	$ 2,656,000	$ 7,080,000
Real Estate | Unconsolidated Real Estate Investment
Investments in REITs
Distributions of earnings from equity method investments	2,000,000.0	3,400,000
Aggregate unamortized basis difference on equity investments	25,000,000.0		$ 25,200,000
Managed Programs
Investments in REITs
Distributions of earnings from equity method investments	1,916,000	5,685,000
Affiliated Entity | CPA:18 – Global
Investments in REITs
Distributions of earnings from equity method investments	$ 900,000	800,000
Affiliated Entity | CPA:18 – Global | Class A
Investments in REITs
Asset management fees receivable, shares	55,975
Affiliated Entity | CPA:18 – Global operating partnership
Investments in REITs
Distributions of earnings from equity method investments	$ 1,900,000	1,800,000
Affiliated Entity | CWI 1
Investments in REITs
Distributions of earnings from equity method investments	800,000	600,000
Affiliated Entity | CWI 1 operating partnership
Investments in REITs
Distributions of earnings from equity method investments	0	1,900,000
Affiliated Entity | CWI 2
Investments in REITs
Distributions of earnings from equity method investments	500,000	400,000
Affiliated Entity | CWI 2 operating partnership
Investments in REITs
Distributions of earnings from equity method investments	0	$ 1,900,000
Affiliated Entity | Managed Programs
Investments in REITs
Aggregate unamortized basis difference on equity investments	$ 13,400,000		$ 47,000,000.0