Equity Investments in the Managed Programs and Real Estate - Narratives (Details) - USD ($) $ in Thousands		3 Months Ended			6 Months Ended
	Feb. 27, 2019	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Investments in REITs
Distributions of earnings from equity method investments					$ 12,889	$ 28,361
CPA:17 – Global
Investments in REITs
Measurement period adjustment, increase to investment in real estate			$ 2,600
Real Estate | Unconsolidated Real Estate Investment
Investments in REITs
Distributions of earnings from equity method investments					12,000	8,600
Aggregate unamortized basis difference on equity investments		$ 25,100			25,100		$ 23,700
Managed Programs
Investments in REITs
Distributions of earnings from equity method investments		$ 3,765		$ 8,776	9,450	19,278
Beach House JV, LLC | Third Party | Real Estate
Investments in REITs
Proceeds from repayment of preferred equity interest	$ 15,000
Affiliated Entity | CPA:17 – Global
Investments in REITs
Distributions of earnings from equity method investments						4,900
Affiliated Entity | CPA: 17 operating partnership
Investments in REITs
Distributions of earnings from equity method investments						11,400
Affiliated Entity | CPA:18 – Global
Investments in REITs
Distributions of earnings from equity method investments					$ 1,600	1,200
Affiliated Entity | CPA:18 – Global | Class A
Investments in REITs
Asset management fees receivable, shares		54,473			54,473
Affiliated Entity | CPA:18 – Global operating partnership
Investments in REITs
Distributions of earnings from equity method investments					$ 4,000	4,700
Affiliated Entity | CWI 1
Investments in REITs
Distributions of earnings from equity method investments					$ 1,300	900
Asset management fees receivable, shares		114,306			114,306
Affiliated Entity | CWI 1 operating partnership
Investments in REITs
Distributions of earnings from equity method investments					$ 2,400	1,000
Affiliated Entity | CWI 2
Investments in REITs
Distributions of earnings from equity method investments					$ 700	500
Affiliated Entity | CWI 2 | Class A
Investments in REITs
Asset management fees receivable, shares		78,392			78,392
Affiliated Entity | CWI 2 operating partnership
Investments in REITs
Distributions of earnings from equity method investments					$ 3,100	$ 2,200
Affiliated Entity | Managed Programs
Investments in REITs
Aggregate unamortized basis difference on equity investments		$ 41,100			41,100		$ 35,200
Affiliated Entity | Apply Sorco AS | CPA:18 – Global | Real Estate
Investments in REITs
Measurement period adjustment, increase to investment in real estate					5,200
Affiliated Entity | Apply Sorco AS | CPA:18 – Global | Real Estate | CPA:17 – Global
Investments in REITs
Measurement period adjustment, increase to investment in real estate					$ 2,600