Related Party Transactions Formation Transactions (Details) (USD $)	0 Months Ended	3 Months Ended		3 Months Ended		0 Months Ended			3 Months Ended
	Oct. 08, 2013	Dec. 31, 2013 Malkin Group [Member]	Dec. 31, 2013 Anthony E. Malkin, Scott D. Malkin and Cynthia M. Blumenthal [Member]	Dec. 31, 2013 Anthony E. Malkin [Member]	Dec. 31, 2013 Peter L. Malkin [Member]	Oct. 08, 2013 Predecessor [Member] Investor [Member]	Oct. 08, 2013 Predecessor [Member] Malkin Group [Member]	Oct. 06, 2013 Common Class A [Member]	Dec. 31, 2013 Common Class A [Member] Malkin Group [Member]	Dec. 31, 2013 Common Class A [Member] Anthony E. Malkin [Member]	Dec. 31, 2013 Common Class A [Member] Peter L. Malkin [Member]	Dec. 31, 2013 Common Class B [Member] Malkin Group [Member]	Dec. 31, 2013 Common Class B [Member] Anthony E. Malkin [Member]	Dec. 31, 2013 Common Class B [Member] Peter L. Malkin [Member]	Dec. 31, 2013 Senior Management [Member]	Dec. 31, 2013 Senior Management [Member] Common Class B [Member]
Related Party Transaction [Line Items]
Proceeds from Issuance Initial Public Offering, Net of Costs of Issuance	$ 2,800,000,000
Payments of Capital Distribution						180,000,000	38,900,000
Representation, Warranty and Indemnity Agreement Deductible			1,000,000
Representation, Warranty and Indemnity Agreement Cap			25,000,000
Ownership Interests Pledged As Security for Representation, Warranty and Indemnification Agreement			$ 25,000,000
Stock Issued During Period, Shares, New Issues								82,200,000	396,025	210,289	2,772	747,435	586,095	100,084		2,407
Partners' Capital Account, Units, Sale of Units		37,748,249		28,718,631	6,027,867										1,167,336
Related Party, Ownership Interest, Diluted Basis, Percent												15.80%	12.00%	2.50%		0.50%