Loss Per Share and Equity (Details 1) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Basic
Net Loss Attributable to CPA®:18 – Global	$ (26,238)	$ (10,601)	$ (4,358)	$ (14,670)	$ (428)	$ (138)	$ (65)	$ 0	$ (55,867)	$ (631)
Class A common stock
Basic
Weighted-Average Shares Outstanding	99,836,316	99,007,256	77,300,223	38,001,011	10,469,534	616,292	23,222	0	78,777,525	2,792,648
Net Loss Attributable to CPA®:18 – Global									(49,494)	(496)
Loss Per Share (in dollars per share)	$ (0.22)	$ (0.10)	$ (0.05)	$ (0.35)	$ (0.03)	$ (0.18)	$ (2.81)	$ 0.00	$ (0.63)	$ (0.18)
Class C common stock
Basic
Weighted-Average Shares Outstanding	15,376,487	9,925,481	6,126,012	3,820,432	1,825,374	149,294	0	0	8,847,966	497,725
Net Loss Attributable to CPA®:18 – Global									$ (6,373)	$ (135)
Loss Per Share (in dollars per share)	$ (0.25)	$ (0.12)	$ (0.07)	$ (0.37)	$ (0.05)	$ (0.20)	$ 0.00	$ 0.00	$ (0.72)	$ (0.27)