Agreements and Transactions with Related Parties (Narratives) (Details) - USD ($)			6 Months Ended		12 Months Ended
	Feb. 20, 2016	Feb. 02, 2016	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015	May 02, 2016	Mar. 31, 2016	Jan. 20, 2016	Dec. 31, 2014
Distributions Of Available Cash and Deferred Revenue Earned
Percentage of available cash distribution to advisor			10.00%
Other Transactions with Affiliates
Proceeds from repayment of short-term loans to affiliates			$ 20,000,000	$ 0
Gain on sale of property			$ 18,944,000	$ 1,201,000
Self-storage
Other Transactions with Affiliates
Ownership interest in joint ventures		38.30%
Self-storage | Third Party
Other Transactions with Affiliates
Ownership interest in joint ventures		61.20%
Maximum
Other Transactions with Affiliates
Ownership interest in joint ventures			90.00%
Minimum
Other Transactions with Affiliates
Ownership interest in joint ventures			3.00%
CPA: 17 - Global
Other Transactions with Affiliates
Line of credit, maximum borrowing amount					$ 75,000,000				$ 75,000,000
CPA:18 - Global
Other Transactions with Affiliates
Line of credit, maximum borrowing amount					100,000,000				100,000,000
CWI
Other Transactions with Affiliates
Line of credit, maximum borrowing amount					110,000,000				110,000,000
CWI 2
Other Transactions with Affiliates
Line of credit, maximum borrowing amount					$ 110,000,000				110,000,000
Loans receivable, related party								$ 20,000,000
Proceeds from repayment of short-term loans to affiliates	$ 20,000,000
Managed Programs
Distributions Of Available Cash and Deferred Revenue Earned
Maximum personnel and overhead reimbursement, percentage			2.20%		2.40%
Other Transactions with Affiliates
Loans receivable, related party					$ 185,400,000
Managed Programs | LIBOR
Other Transactions with Affiliates
Interest rate on loan					1.10%
CCIF
Distributions Of Available Cash and Deferred Revenue Earned
Reimbursement percentage			50.00%
Other Transactions with Affiliates
Line of credit, maximum borrowing amount					$ 50,000,000				$ 50,000,000
CESH I
Other Transactions with Affiliates
Line of credit, maximum borrowing amount							$ 35,000,000
Loans receivable, related party						$ 17,100,000
Employee | Self-storage
Other Transactions with Affiliates
Ownership interest in joint ventures		0.50%
Gain on sale of property		$ 100,000
Average adjusted capital | CCIF | Maximum
Distributions Of Available Cash and Deferred Revenue Earned
Incentive fees			2.344%
Average adjusted capital | CCIF | Minimum
Distributions Of Available Cash and Deferred Revenue Earned
Incentive fees			1.875%
Net investment income | CCIF | Minimum
Distributions Of Available Cash and Deferred Revenue Earned
Incentive fees			20.00%
Capital gain | CCIF | Minimum
Distributions Of Available Cash and Deferred Revenue Earned
Incentive fees			20.00%
Front-end fees | CCIF
Distributions Of Available Cash and Deferred Revenue Earned
Maximum personnel and overhead reimbursement, percentage			18.00%
Gross proceeds | CCIF
Distributions Of Available Cash and Deferred Revenue Earned
Maximum personnel and overhead reimbursement, percentage			82.00%
Average net asset | CCIF
Distributions Of Available Cash and Deferred Revenue Earned
Reimbursement percentage			1.75%