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Land and Development (Acquisitions, Dispositions, and Redeemable Noncontrolling Interest) (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
a
parcel
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Jan. 22, 2015
a
Property, Plant and Equipment [Line Items]            
Number of land parcels sold | parcel     1      
Area of land parcels sold | a     1,250      
Land development revenue $ 25,962,000 $ 31,554,000 $ 178,722,000 $ 74,389,000    
Land development cost of sales 27,512,000 22,004,000 165,888,000 50,842,000    
Noncontrolling interest increase (percent)         10.70%  
Noncontrolling interest, decrease from redemptions or purchase of interests         $ 10,800,000  
Noncontrolling interest, ownership percentage by parent         95.70%  
Impairment of assets 595,000 $ 8,741,000 15,292,000 11,753,000    
Redeemable noncontrolling interests 3,513,000   3,513,000   $ 5,031,000  
Land & Development            
Property, Plant and Equipment [Line Items]            
Impairment of assets     10,100,000 $ 3,800,000    
Not Currently Redeemable            
Property, Plant and Equipment [Line Items]            
Redeemable noncontrolling interests $ 0   0   $ 1,300,000  
Lennar            
Property, Plant and Equipment [Line Items]            
Area of land subject to litigation (in acres) | a           1,250
Prince George's County, Maryland            
Property, Plant and Equipment [Line Items]            
Land development revenue     114,000,000      
Land development cost of sales     $ 106,300,000