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Subsequent Events (Details) (USD $)
 0 Months Ended 0 Months Ended
Oct. 07, 2013
Successor [Member]
office_and_property
Oct. 07, 2013
Successor [Member]
Subsequent Event [Member]
Common Class A [Member]
Sep. 30, 2013
Successor [Member]
Subsequent Event [Member]
The Empire State Building [Member]
Mortgages [Member]
Oct. 07, 2013
Successor [Member]
Secured Debt [Member]
Subsequent Event [Member]
Sep. 30, 2013
Predecessor [Member]
Dec. 31, 2012
Predecessor [Member]
Oct. 07, 2013
Predecessor [Member]
Subsequent Event [Member]
office_and_property
Oct. 07, 2013
Predecessor [Member]
Subsequent Event [Member]
Common Class A [Member]
Sep. 30, 2013
Predecessor [Member]
Subsequent Event [Member]
The Empire State Building [Member]
Mortgages [Member]
Oct. 07, 2013
Predecessor [Member]
Secured Debt [Member]
Subsequent Event [Member]
Subsequent Event [Line Items]                    
Shares issued at IPO   82,225,000           82,225,000    
Share price   $ 13.00           $ 13.00    
Proceeds from IPO, gross   $ 1,070,000,000           $ 1,070,000,000    
Proceeds from IPO   884,100,000           884,100,000    
Number of properties 4           4      
Maximum borrowing capacity       800,000,000.0           800,000,000.0
Face amount     500,000,000           500,000,000  
Long-term Debt     $ 300,000,000   $ 1,061,048,000 $ 978,150,000     $ 300,000,000