Investments in Non-controlled Entities Summary of Financial Information of Non-consolidated Entities - Statements of Operations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2013	Oct. 06, 2013	Dec. 31, 2014	Dec. 31, 2012
Revenue:
Rental revenue and other		$ 143,637		$ 188,307
Observatory revenue		76,687		91,870
Total revenue		220,324		280,177
Expenses:
Operating expenses—rental		114,255		150,778
Operating expenses—overage rent		11,000		26,696
Operating expenses—observatory		17,150		20,709
Interest		6,081		7,741
Depreciation and amortization		17,574		19,712
Total expenses		166,060		225,636
Net income		54,264		54,541
Our predecessor's share of equity in net income of non-controlled entities	0	14,875	0	14,348
Empire State Building Co. [Member]
Revenue:
Rental revenue and other		101,496		133,666
Observatory revenue		76,687		91,870
Total revenue		178,183		225,536
Expenses:
Operating expenses—rental		89,670		119,482
Operating expenses—overage rent		10,894		24,199
Operating expenses—observatory		17,150		20,709
Interest		0		0
Depreciation and amortization		10,997		13,615
Total expenses		128,711		178,005
Net income		49,472		47,531
Our predecessor's share of equity in net income of non-controlled entities		13,467		11,015
1333 Broadway Associates [Member]
Revenue:
Rental revenue and other		11,711		14,539
Observatory revenue		0		0
Total revenue		11,711		14,539
Expenses:
Operating expenses—rental		5,766		7,528
Operating expenses—overage rent		0		0
Operating expenses—observatory		0		0
Interest		3,620		4,748
Depreciation and amortization		2,186		1,112
Total expenses		11,572		13,388
Net income		139		1,151
Our predecessor's share of equity in net income of non-controlled entities		70		576
1350 Broadway Associates [Member]
Revenue:
Rental revenue and other		16,439		21,275
Observatory revenue		0		0
Total revenue		16,439		21,275
Expenses:
Operating expenses—rental		7,989		10,667
Operating expenses—overage rent		0		0
Operating expenses—observatory		0		0
Interest		2,461		2,993
Depreciation and amortization		3,264		3,489
Total expenses		13,714		17,149
Net income		2,725		4,126
Our predecessor's share of equity in net income of non-controlled entities		1,179		2,063
501 Seventh Avenue Associates [Member]
Revenue:
Rental revenue and other		13,991		18,827
Observatory revenue		0		0
Total revenue		13,991		18,827
Expenses:
Operating expenses—rental		10,830		13,101
Operating expenses—overage rent		106		2,497
Operating expenses—observatory		0		0
Interest		0		0
Depreciation and amortization		1,127		1,496
Total expenses		12,063		17,094
Net income		1,928		1,733
Our predecessor's share of equity in net income of non-controlled entities		$ 159		$ 694