Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2013
Successor [Member]
Subsequent Event [Line Items]
Subsequent Events	SUBSEQUENT EVENTS The Company completed the Offering on October 7, 2013. ESRT issued 82,225,000 shares at $13.00 per share. The gross proceeds were approximately $1.07 billion and the net proceeds from the Offering were approximately $884.1 million, including the underwriters’ overallotment option which was exercised in full (after deducting the underwriting discount and commissions and estimated expenses of the Offering and formation transactions). Concurrently with the Offering, the Operating Partnership completed a series of formation transactions pursuant to which it acquired, through a series of contributions and merger transactions, the assets and liabilities of (i) its predecessor and (ii) the entities through which the predecessor held non-controlling interests in four properties, for which the predecessor acted as the supervisor but which were not combined into the predecessor for accounting purposes. In the aggregate, these interests comprise the Operating Partnership's ownership of its property portfolio. Upon completion of the Offering and formation transactions, all of the holders of interests in the predecessor received shares of common stock, operating partnership units and/or cash as consideration for their respective interests, and as a result became equity owners of the Company and/or its Operating Partnership. Holders of interests in the predecessor who received cash did not become equity owners of the Operating Partnership. The formation transactions, including the consideration received by the holders of interests in the predecessor, are described in greater detail in the final prospectus relating to the Offering, which the Company filed with the SEC. Concurrently with the closing of the Offering, the Operating Partnership entered into an agreement for a secured revolving and term credit facility in the maximum aggregate original principal amount of up to $800,000. The secured revolving and term credit facility was used to fully repay the existing $500,000 term loan previously secured by the Empire State Building, which had a balance of $300,000 as of September 30, 2013.
Predecessor [Member]
Subsequent Event [Line Items]
Subsequent Events	Subsequent Events We completed the Offering on October 7, 2013. We issued 82,225,000 shares at $13.00 per share. The gross proceeds were approximately $1.07 billion and the net proceeds from the Offering were approximately $884,100, including the underwriters’ overallotment option which was exercised in full (after deducting the underwriting discount and commissions and estimated expenses of the offering and formation transactions). Concurrently with the Offering, we completed a series of formation transactions pursuant to which we acquired, through a series of contributions and merger transactions, the assets and liabilities of (i) our predecessor and (ii) the entities through which our predecessor held non-controlling interests in four properties, for which our predecessor acted as the supervisor but which were not combined into our predecessor for accounting purposes. In the aggregate, these interests comprise our ownership of our property portfolio. Upon completion of the Offering and formation transactions, all of the holders of interests in our predecessor received shares of common stock, operating partnership units and/or cash as consideration for their respective interests, and as a result became equity owners of our company and/or our Operating Partnership. Holders of interests in the predecessor who received cash did not become equity owners of the Company. The formation transactions, including the consideration received by the holders of interests in our predecessor, are described in greater detail in the final prospectus relating to the Offering, dated October 1, 2013, which we filed with the SEC. Concurrently with the closing of the Offering, we entered into an agreement for a secured revolving and term credit facility in the maximum aggregate original principal amount of up to $800,000. The secured revolving and term credit facility was used to fully repay the existing $500,000 term loan previously secured by the Empire State Building, which had a balance of $300,000 as of September 30, 2013. We have not yet obtained all the information necessary to finalize our estimates to complete the purchase price allocations in accordance with Accounting Standards Codification 805 related to the assets and liabilities acquired in the formation transactions. The purchase price allocations will be finalized once the information we identified has been received, which should not be longer than one year from the date of acquisition.