Investments in Non-controlled Entities Summary of Financial Information of Non-consolidated Entities - Statements of Operations (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2012
Revenue:
Rental revenue and other		$ 89,415,000
Observatory revenue		44,052,000
Total revenue		133,467,000
Expenses:
Operating expenses—rental		72,546,000
Operating expenses—overage rent		14,874,000
Operating expenses—observatory		10,669,000
Interest		3,936,000
Depreciation and amortization		11,664,000
Total expenses		113,689,000
Net income (loss)		19,778,000
Our predecessor's share of equity in net income (loss) of non-controlled entities	0	7,898,000	0	7,898,000
Equity Method Investments	0	82,515,000	0	82,515,000	76,879,000
Empire State Building Co. [Member]
Revenue:
Rental revenue and other		62,866,000
Observatory revenue		44,052,000
Total revenue		106,918,000
Expenses:
Operating expenses—rental		57,602,000
Operating expenses—overage rent		14,424,000
Operating expenses—observatory		10,669,000
Interest		0
Depreciation and amortization		7,287,000
Total expenses		89,982,000
Net income (loss)		16,936,000
Our predecessor's share of equity in net income (loss) of non-controlled entities		7,267,000
1333 Broadway Associates [Member]
Revenue:
Rental revenue and other		7,062,000
Observatory revenue		0
Total revenue		7,062,000
Expenses:
Operating expenses—rental		3,315,000
Operating expenses—overage rent		0
Operating expenses—observatory		0
Interest		2,369,000
Depreciation and amortization		1,459,000
Total expenses		7,143,000
Net income (loss)		(81,000)
Our predecessor's share of equity in net income (loss) of non-controlled entities		(41,000)
1350 Broadway Associates [Member]
Revenue:
Rental revenue and other		10,622,000
Observatory revenue		0
Total revenue		10,622,000
Expenses:
Operating expenses—rental		5,051,000
Operating expenses—overage rent		0
Operating expenses—observatory		0
Interest		1,567,000
Depreciation and amortization		2,157,000
Total expenses		8,775,000
Net income (loss)		1,847,000
Our predecessor's share of equity in net income (loss) of non-controlled entities		803,000
501 Seventh Avenue Associates [Member]
Revenue:
Rental revenue and other		8,865,000
Observatory revenue		0
Total revenue		8,865,000
Expenses:
Operating expenses—rental		6,578,000
Operating expenses—overage rent		450,000
Operating expenses—observatory		0
Interest		0
Depreciation and amortization		761,000
Total expenses		7,789,000
Net income (loss)		1,076,000
Our predecessor's share of equity in net income (loss) of non-controlled entities		$ (131,000)