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Acquisitions Acquisitions - Additional Information (Details) (USD $)
 0 Months Ended 9 Months Ended
Jul. 15, 2014
Sep. 30, 2014
Sep. 30, 2013
Business Acquisition [Line Items]      
Total consideration paid $ 733,600,000    
Debt assumed 167,684,000 182,851,000 0
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable   379,328,000 0
112 West 34th Street [Member]
      
Business Acquisition [Line Items]      
Total consideration paid 423,600,000    
Debt assumed 87,700,000    
Payments to Acquire Businesses, Gross 106,900,000    
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable 229,000,000    
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares 13,753,009    
Location 1400 Broadway [Member]
      
Business Acquisition [Line Items]      
Total consideration paid 310,000,000    
Debt assumed 80,000,000    
Payments to Acquire Businesses, Gross 79,700,000    
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable $ 150,300,000    
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares 9,029,456