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Properties Held for Sale - Narrative (Details)
ft² in Thousands, $ in Thousands
3 Months Ended
Apr. 18, 2019
USD ($)
ft²
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Real Estate [Line Items]        
Real estate held-for-sale     $ 229,567 $ 99,627
Subsequent Event        
Real Estate [Line Items]        
Payments to acquire noncontrolling interest interest in joint venture $ 26,000      
Payments for transaction costs for joint venture 56,000      
Real estate held-for-sale 5,556,000      
Tax gain from real estate joint venture 735,000      
666 Fifth Avenue | Subsequent Event        
Real Estate [Line Items]        
Payments of mortgage loans held-for-sale 390,000      
655 Fifth Avenue | Subsequent Event        
Real Estate [Line Items]        
Payments of mortgage loans held-for-sale 140,000      
640 Fifth Avenue | Subsequent Event        
Real Estate [Line Items]        
Proceeds from mortgage loan $ 500,000      
Retail | Subsequent Event        
Real Estate [Line Items]        
Square footage of real estate property (in sqft) | ft² 489      
Office | Subsequent Event        
Real Estate [Line Items]        
Square footage of real estate property (in sqft) | ft² 327      
Forecast        
Real Estate [Line Items]        
Proceeds from real estate joint ventures   $ 2,600,000    
Fifth Avenue and Times Square JV | Joint Venture | Subsequent Event        
Real Estate [Line Items]        
Aggregate of preferred equity interests $ 1,827,750      
Preferred equity coupon, stated percentage (percent) 4.25%      
Fifth Avenue and Times Square JV | 666 Fifth Avenue | Joint Venture | Subsequent Event        
Real Estate [Line Items]        
Equity method ownership percentage 52.00%      
Aggregate of preferred equity interests $ 390,000      
Fifth Avenue and Times Square JV | 655 Fifth Avenue | Joint Venture | Subsequent Event        
Real Estate [Line Items]        
Equity method ownership percentage 50.00%      
Aggregate of preferred equity interests $ 140,000      
Fifth Avenue and Times Square JV | 640 Fifth Avenue | Joint Venture | Subsequent Event        
Real Estate [Line Items]        
Equity method ownership percentage 52.00%      
Aggregate of preferred equity interests $ 0      
Fifth Avenue and Times Square JV | Vornado Realty Trust | Joint Venture | Subsequent Event        
Real Estate [Line Items]        
Equity method ownership percentage 51.50%      
Equity method effective ownership percentage 51.00%      
Aggregate of preferred equity interests $ 500,000      
Proceeds from real estate joint ventures $ 1,198,000      
Fifth Avenue and Times Square JV | Increase in Percentage After Fifth Anniversary | Joint Venture | Subsequent Event        
Real Estate [Line Items]        
Preferred equity coupon, stated percentage (percent) 4.75%      
Investors | Fifth Avenue and Times Square JV | Joint Venture | Subsequent Event        
Real Estate [Line Items]        
Equity method ownership percentage 48.50%      
Equity method effective ownership percentage 47.20%