Acquisitions Narrative (Details) (USD $)	0 Months Ended	3 Months Ended										12 Months Ended						0 Months Ended	3 Months Ended			0 Months Ended				0 Months Ended	9 Months Ended	12 Months Ended
	Oct. 06, 2013 entity	Dec. 31, 2013	Dec. 31, 2013		Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Leases and Deferred Leasing Costs [Member]	Dec. 31, 2013 Acquired above-market leases [Member]	Dec. 31, 2013 Below Market Lease [Member]	Oct. 06, 2013 Total Acquisitions [Member]	Dec. 31, 2013 Total Acquisitions [Member]	Oct. 06, 2013 Empire State Building Observatory Operations [Member]	Oct. 06, 2013 Empire State Building, L.L.C. [Member]	Oct. 06, 2013 1333 Broadway Associates [Member]	Oct. 06, 2013 1350 Broadway Associates [Member]	Oct. 06, 2013 Empire State Building Company L.L.C. and 501 Seventh Avenue Associates L.L.C. [Member] [Member]	Oct. 06, 2013 501 Seventh Avenue Associates [Member]	Oct. 06, 2013 Predecessor [Member]	Oct. 06, 2013 Predecessor [Member]	Dec. 31, 2012 Predecessor [Member]	Dec. 31, 2011 Predecessor [Member]	Oct. 06, 2013 Predecessor [Member] Empire State Building Co. [Member]	Oct. 06, 2013 Predecessor [Member] 1333 Broadway Associates [Member]	Oct. 06, 2013 Predecessor [Member] 1350 Broadway Associates [Member]	Oct. 06, 2013 Predecessor [Member] 501 Seventh Avenue Associates [Member]
Business Acquisition [Line Items]
Number of entities acquired	4
Ownership percentage																														23.75%	50.00%	50.00%	20.469%
Gain on consolidation of non-controlled entities		$ 322,563,000																$ 214,300,000				$ 41,000,000	$ 32,100,000	$ 35,200,000			$ 0	$ 0	$ 0
Noncontrolling interest ownership interest fair value																										302,700,000
Noncontrolling interest ownership interest cost																										88,400,000	88,400,000
Goodwill		491,479,000	491,479,000									491,479,000						491,479,000		227,500,000	250,800,000				13,200,000			0
Weighted average useful life															5 years 7 months 6 days	4 years 8 months 12 days	5 years 2 months 12 days
Total revenues		127,583,000	149,388,000	[1]	62,278,000	59,569,000	62,420,000	83,633,000	59,415,000	57,404,000	59,842,000	206,072,000	260,294,000	294,788,000					77,000,000								206,072,000	260,294,000	294,788,000
Operating expenses		105,428,000																	48,500,000								152,519,000	171,605,000	186,538,000
Operating income		22,155,000																	28,500,000								53,553,000	88,689,000	108,250,000
Net income		$ 75,245,000	$ 30,731,000	[1]															$ 27,600,000								$ 0	$ 0	$ 0

[1] The results of operations of our predecessor for October 1, 2013 through October 6, 2013 and the results of operations of our company for October 7, 2013 through December 31, 2013 have been combined.