Acquisitions of CapLease, Cole and CCPT - Cole Acquisition Narrative (Details) (USD $) Share data in Millions, unless otherwise specified			0 Months Ended	2 Months Ended		0 Months Ended	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Feb. 07, 2014 Cole Merger [Member]	Mar. 31, 2014 Cole Merger [Member]	Jun. 30, 2014 Cole Merger [Member]	Feb. 07, 2014 Cole Merger [Member] Common Stock [Member]	Jun. 30, 2014 Cole Merger [Member] Management And Advisory Contracts [Member]	Jun. 30, 2014 Cole Merger [Member] Real Estate Investment Segment [Member]	Feb. 07, 2014 Cole Merger [Member] Real Estate Investment Segment [Member]	Jun. 30, 2014 Cole Merger [Member] Cole Capital Segment [Member]	Feb. 07, 2014 Cole Merger [Member] Cole Capital Segment [Member]
Business Acquisition [Line Items]
Business combination, consideration transferred			$ 7,484,255,000
Business acquisition, equity interest issued or issuable, number of shares						520.8
Total real estate investments			8,959,899,000		8,957,366,000			8,957,366,000	8,959,899,000
Below-market leases			212,377,000		212,391,000			212,391,000	212,377,000
Finite-lived intangible asset, useful life							4 years
Amortization of intangible assets							38,000,000
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
Amortization expense, remainder of 2014					48,600,000
Amortization expense, 2015					96,300,000
Amortization expense, 2016					96,300,000
Amortization expense, 2017					96,300,000
Amortization expense, 2018					9,800,000
Goodwill	2,304,880,000	96,720,000	2,184,703,000		2,208,160,000			1,660,045,000	1,628,571,000	548,115,000	556,132,000
Revenue of acquiree since acquisition date				366,200,000
Earnings or loss of acquiree since acquisition date				$ 32,000,000