Consolidated Statements of Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total USD ($)	Class A	Class C	Common Stock Class A USD ($)	Common Stock Class C USD ($)	Common Stock General Common Stock USD ($)	Additional Paid-In Capital USD ($)	Distributions and Accumulated Losses USD ($)	Accumulated Other Comprehensive Loss USD ($)	Treasury Stock USD ($)	Total CPA 18 - Global Stockholders USD ($)	Noncontrolling Interests USD ($)
Beginning equity balance, value at Sep. 07, 2012	$ 0			$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0
Statements of Equity
Shares, $0.001 par value, issued to Carey REIT II, Inc. at $9.00 per share, values	209					0	209				209
Shares, $0.001 par value, issued to Carey REIT II, Inc. at $9.00 per share, shares						23,222
Ending equity balance, value at Dec. 31, 2012	209			0	0	0	209	0	0		209	0
Ending equity balance, shares at Dec. 31, 2012				0	0	23,222
Statements of Equity
Renaming of General Shares to Class A common stock, value	0			0		0					0
Renaming of General Shares to Class A common stock, shares				23,222		(23,222)
Shares issued net of offering cost, value	215,040			21	3		215,016				215,040
Shares issued net of offering cost, shares				21,251,565	2,776,001
Shares issued to affiliate, value	79			0			79				79
Shares issued to affiliate, shares				7,903
Stock-based compensation, value	67			0			67				67
Stock-based compensation, shares				7,407
Contributions from noncontrolling interests	38,169											38,169
Distributions to noncontrolling interests	(853)											(853)
Distributions declared	(1,936)							(1,936)			(1,936)
Net Loss	(241)							(631)			(631)	390
Other Comprehensive Loss
Foreign currency translation adjustments	156								125		125	31
Change in unrealized loss on derivative instrument	(219)								(219)		(219)
Ending equity balance, value at Dec. 31, 2013	250,471			21	3	0	215,371	(2,567)	(94)	0	212,734	37,737
Ending equity balance, shares at Dec. 31, 2013		21,290,097	2,776,001	21,290,097	2,776,001	0
Statements of Equity
Shares issued net of offering cost, value	839,191			79	15		839,097				839,191
Shares issued net of offering cost, shares				78,548,660	15,250,012
Shares issued to affiliate, value	2,294						2,294				2,294
Shares issued to affiliate, shares				229,387
Stock-based compensation, value	100						100				100
Stock-based compensation, shares				11,111
Contributions from noncontrolling interests	117,761											117,761
Distributions to noncontrolling interests	(69,838)											(69,838)
Distributions declared	(53,444)							(53,444)			(53,444)
Net Loss	(56,556)							(55,867)			(55,867)	(689)
Other Comprehensive Loss
Foreign currency translation adjustments	(29,602)								(22,218)		(22,218)	(7,384)
Change in unrealized loss on derivative instrument	1,371								1,371		1,371
Repurchase of shares, value	(1,520)									(1,520)	(1,520)
Repurchase of shares, shares				(155,246)
Ending equity balance, value at Dec. 31, 2014	$ 1,000,228			$ 100	$ 18		$ 1,056,862	$ (111,878)	$ (20,941)	$ (1,520)	$ 922,641	$ 77,587
Ending equity balance, shares at Dec. 31, 2014		99,924,009	18,026,013	99,924,009	18,026,013