Subsequent Events (Details)		1 Months Ended	3 Months Ended		6 Months Ended		7 Months Ended
	Aug. 02, 2016 USD ($)	Jul. 31, 2016 USD ($) loan $ / shares shares	Jun. 30, 2016 USD ($) $ / shares shares	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) $ / shares shares	Jun. 30, 2015 USD ($)	Jul. 29, 2016 USD ($) $ / shares shares	Jul. 05, 2016 USD ($)	Dec. 31, 2015 USD ($)	Jun. 03, 2015 USD ($)	Dec. 31, 2014 USD ($)
Subsequent Event [Line Items]
Proceeds from shares issued under “at-the-market” offering, net of selling costs					$ 18,890,000	$ 0
Real estate, at cost			$ 5,910,415,000		5,910,415,000				$ 5,826,544,000
Non-recourse debt			2,110,441,000		2,110,441,000				2,269,421,000
Lease revenues			167,328,000	$ 162,574,000	342,572,000	$ 322,739,000
Domestic properties
Subsequent Event [Line Items]
Lease revenues			$ 3,000,000		$ 5,900,000
CPA:18 - Global
Subsequent Event [Line Items]
Line of credit, maximum borrowing amount									$ 100,000,000		$ 100,000,000
ATM
Subsequent Event [Line Items]
Shares, issued (shares) | shares			281,301		281,301
Weighted average share price, shares issued (per share) | $ / shares			$ 68.47		$ 68.47
Proceeds from shares issued under “at-the-market” offering, net of selling costs			$ 19,000,000		$ 19,000,000
Common stock maximum offering value			$ 380,700,000		$ 380,700,000					$ 400,000,000
Subsequent Event
Subsequent Event [Line Items]
Loans repaid, count | loan		6
Principal Amount		$ 108,000,000
Subsequent Event | Encumbered Property
Subsequent Event [Line Items]
Principal Amount		50,800,000
Subsequent Event | Domestic properties
Subsequent Event [Line Items]
Real estate, at cost								$ 13,700,000
Non-recourse debt								$ 27,000,000
Proceeds from sale of property held-for-sale	$ 175,000,000
Subsequent Event | CPA:18 - Global
Subsequent Event [Line Items]
Line of credit, maximum borrowing amount		$ 50,000,000
Subsequent Event | ATM
Subsequent Event [Line Items]
Shares, issued (shares) | shares		548,918					830,219
Weighted average share price, shares issued (per share) | $ / shares		$ 68.87					$ 68.74
Proceeds from shares issued under “at-the-market” offering, net of selling costs		$ 37,200,000					$ 56,200,000
Common stock maximum offering value							$ 342,900,000