Segment Reporting Reportable Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended											9 Months Ended	12 Months Ended
	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	Oct. 06, 2013	Dec. 31, 2013 segment	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Number of reportable segments													2
Total revenues	$ 127,583		$ 149,388	[1]	$ 62,278	$ 59,569	$ 62,420	$ 83,633	$ 59,415	$ 57,404	$ 59,842		$ 206,072	$ 260,294	$ 294,788
Interest expense	(13,147)
Depreciation and amortization expense	(27,375)
Equity in net income of non-controlled entities	0											14,875	14,875	14,348	3,893
Segment profit (loss)	75,245		30,731	[1]
Segment assets	2,476,061		2,476,061										2,476,061
Investment in non-controlled entities	0		0					76,879					0	76,879	72,626
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Total revenues	(21,671)												(6,893)	(5,788)	(6,549)
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	149,234												212,813	265,982	301,300
Total [Member]
Segment Reporting Information [Line Items]
Total revenues	127,563											205,920		260,194	294,751
All operating expenses, excluding noncash items	(84,178)											(91,452)		(110,582)	(137,955)
Interest expense	(13,147)											(50,660)		(54,394)	(54,746)
Depreciation and amortization expense	(27,385)											(38,982)		(42,690)	(35,513)
Equity in net income of non-controlled entities												14,875		14,348	3,893
Segment assets	2,476,061		2,476,061					975,674				1,033,918	2,476,061	975,674	932,345
Investment in non-controlled entities								76,879				88,304		76,879	72,626
Expenditures for segment assets	56,434											55,950		87,659	60,582
Total [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Total revenues	21,671											6,893		5,788	6,549
Total [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	149,234											212,813		265,982	301,300
Segment profit (loss)	24,524											46,594		72,664	76,979
Real Estate [Member]
Segment Reporting Information [Line Items]
Total revenues	98,564											187,284		241,292	247,191
All operating expenses, excluding noncash items	(51,643)											(65,628)		(85,848)	(85,833)
Interest expense	(13,147)											(50,660)		(54,394)	(54,746)
Depreciation and amortization expense	(27,376)											(38,963)		(42,661)	(35,481)
Equity in net income of non-controlled entities												14,875		14,348	3,893
Segment assets	2,218,143		2,218,143					964,160				1,023,333	2,218,143	964,160	916,617
Investment in non-controlled entities								76,879				88,304		76,879	72,626
Expenditures for segment assets	56,434											55,820		87,659	60,582
Real Estate [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Total revenues	20,134	[2]										56		74	73
Real Estate [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	118,698											187,340		241,366	247,264
Segment profit (loss)	26,532											46,964		72,811	75,097
Observatory [Member]
Segment Reporting Information [Line Items]
Total revenues	23,735
All operating expenses, excluding noncash items	(25,743)
Interest expense	0
Depreciation and amortization expense	(4)
Segment assets	249,084		249,084										249,084
Expenditures for segment assets	0
Observatory [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Total revenues	0
Observatory [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	23,735
Segment profit (loss)	(2,012)
Other [Member]
Segment Reporting Information [Line Items]
Total revenues	5,264											18,636		18,902	47,560
All operating expenses, excluding noncash items	(6,792)											(25,824)		(24,734)	(52,122)
Interest expense	0											0		0	0
Depreciation and amortization expense	(5)											(19)		(29)	(32)
Equity in net income of non-controlled entities												0		0	0
Segment assets	8,834		8,834					11,514				10,585	8,834	11,514	15,728
Investment in non-controlled entities								0				0		0	0
Expenditures for segment assets	0											130		0	0
Other [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Total revenues	1,537											6,837		5,714	6,476
Other [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	6,801											25,473		24,616	54,036
Segment profit (loss)	$ 4											$ (370)		$ (147)	$ 1,882

[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.

[2] The observatory pays a market-based rent payment comprised of fixed and percentage rent to the Empire State Building.