Acquisition of CapLease and Cole Acquisition of CapLease and Cole - Cole Acquisition Narrative (Details) (USD $)	3 Months Ended			0 Months Ended	2 Months Ended	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Feb. 07, 2014 Cole Merger [Member]	Mar. 31, 2014 Cole Merger [Member]	Mar. 31, 2014 Cole Merger [Member] Management And Advisory Contracts [Member]	Feb. 07, 2014 Cole Merger [Member] Real Estate Investment Segment [Member]	Feb. 07, 2014 Cole Merger [Member] Private Capital Management
Business Acquisition [Line Items]
Business combination, consideration transferred				$ 7,467,643,000
Common stock, value, issued	7,699,000		2,392,000
Real estate investments acquired				8,959,899,000			8,959,899,000	0
Below-market lease liabilities				212,377,000			212,377,000	0
Finite-lived intangible asset, useful life						4 years
Amortization of intangible assets	13,992,000	0				14,000,000
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
Amortization expense, remainder of 2014					72,600,000
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	2,287,122,000		102,419,000	2,184,703,000			1,628,571,000	556,132,000
Revenue of acquiree since acquisition date					162,600,000
Earnings or loss of acquiree since acquisition date					$ 700,000