Agreements and Transactions with Related Parties (Narratives) (Details) (USD $)	0 Months Ended	1 Months Ended	9 Months Ended									9 Months Ended									9 Months Ended		0 Months Ended	9 Months Ended			9 Months Ended
	Apr. 04, 2013	Feb. 28, 2014	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Long-term net lease	Sep. 30, 2014 Long-term net lease Current	Sep. 30, 2014 Long-term net lease Deferred	Sep. 30, 2014 Maximum	Sep. 30, 2014 Minimum	Sep. 30, 2014 CPA: 16 - Global Average invested assets	Jan. 31, 2013 CPA: 17 - Global	Sep. 30, 2014 CPA: 17 - Global Maximum	Sep. 30, 2014 CPA: 17 - Global Maximum Average equity value	Sep. 30, 2014 CPA: 17 - Global Minimum	Sep. 30, 2014 CPA: 17 - Global Minimum Average equity value	Sep. 30, 2014 CPA:18 - Global	Dec. 31, 2013 CPA:18 - Global	Aug. 20, 2013 CPA:18 - Global	Sep. 30, 2014 CPA:18 - Global Class A	Sep. 30, 2014 CPA:18 - Global Class C	Sep. 30, 2014 CPA:18 - Global Maximum	Sep. 30, 2014 CPA:18 - Global Minimum	Jun. 25, 2014 CWI	Sep. 30, 2014 CWI	Dec. 31, 2013 CWI	Sep. 30, 2013 CWI	Sep. 30, 2014 CWI Contract sales price of investment	Sep. 30, 2014 CWI Lodging-related investments	Sep. 30, 2014 CWI Maximum Contract sales price of investment
Revenue from related parties
Percentage of asset management fees earned										0.50%		1.75%		0.50%							1.50%	0.50%						0.50%
Structuring revenue
Percentage of acquisition fees earned					4.50%	2.50%	2.00%						1.75%		0.00%												2.50%		6.00%
Installment Period for Deferred Acquisition Fee Receivable			three years
Loan refinancing fee																								1.00%
Unpaid transaction fee interest rate								5.00%	2.00%
Reimbursed costs from affiliates and wholesaling revenue
Selling commission per share sold											$ 0.65								$ 0.7	$ 0.14				$ 0.70		$ 0.7
Dealer manager fee per share sold											$ 0.35								$ 0.3	$ 0.21				$ 0.30		$ 0.3
Shareholder servicing, percentage																				1.00%
Underwriting compensation limit, percentage																				10.00%
Maximum percent of offering proceeds																								2.00%
Maximum percentage of follow-on offering proceeds																								4.00%
Organization and offering costs incurred																$ 7,700,000								$ 12,300,000
Reimbursed offering costs																7,400,000								12,300,000
Aggregate gross proceeds threshold																1.50%
Distributions Of Available Cash and Deferred Revenue Earned
Percentage of available cash distribution to advisor			10.00%
Other Transactions with Affiliates
Line of credit, maximum borrowing amount																	100,000,000								75,000,000
Loans receivable, related party																		15,000,000					11,000,000
Interest rate on loan																							1.10%
Receivable maturity date																							Jun. 30, 2015
Ownership interest in joint ventures								90.00%	3.00%
Share Purchase Agreement
Redemption value adjustment			0	40,000,000
Stock repurchased during period, shares	616,971	11,037
Repurchase of common stock	$ 40,000,000	$ 700,000	$ 679,000	$ 40,000,000
Common stock market value on exercise date	$ 64.83