Variable Interest Entities ("VIE") (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Lot Option Purchase Disclosures    
Consolidated inventory not owned $ 30,738,000 $ 30,811,000
Noncontrolling interest 14,227,000 14,430,000
Primary variable interest | Lot option purchase contracts    
Lot Option Purchase Disclosures    
Consolidated inventory not owned 30,700,000 30,800,000
Cash deposits 16,500,000 16,400,000
Noncontrolling interest 14,200,000 14,400,000
Not primary variable interest | Lot option purchase contracts    
Lot Option Purchase Disclosures    
Cash deposits and/or letters of credit 24,600,000 25,000,000
Aggregate purchase price $ 367,300,000 $ 368,700,000