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Summary of Significant Accounting Policies (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Assumption Duration [Line Items]      
Real Estate Accumulated Depreciation, Depreciation Expense $ 4,800,000 $ 3,500,000 $ 4,000,000
Restricted Cash and Cash Equivalents 8,680,000 41,334,000  
Servicing Asset at Fair Value, Period Increase (Decrease) (795,000) 0 0
Cash in Transit 6,700,000 8,800,000  
Financial Services Cash 19,100,000 16,300,000  
Aggregate Capacity of Secured Letters of Credit under Credit Facility 18,000,000    
Security pledged as collateral that has been released   25,000,000  
Limited Partners' Contributed Capital 11,732,000    
Consolidated inventory not owned 19,105,000 6,596,000  
Specific Performance Obligation Under Contracts 2,600,000 2,000,000  
Obligation for consolidated inventory not owned 19,105,000 2,944,000  
Notes receivable 8,800,000 900,000  
Notes Receivable, Related Parties 2,500,000    
Debt Instrument, Unamortized Discount 9,100,000 5,400,000  
Number of loans we retain mortgage servicing rights on 369    
Advertising Expense 5,400,000 4,900,000 6,100,000
Research and Development Expense 2,400,000 2,500,000 2,400,000
Defined Benefit Plan, Contributions by Employer 600,000 400,000 400,000
Outstanding Deposits On Land and Lots 14,900,000    
Land purchase deposits 8,727,000 2,676,000  
Prepaid Land Acquisition Costs 2,100,000    
Outstanding Letters of Credit in Lieu of Cash Deposits under Certain Land Option Contracts 4,138,000    
Letters of Credit and Bonds 61,795,000    
Outstanding Performance Bonds 32,641,000    
Performance letters of credit outstanding 16,232,000    
Financial Letters of Credit 9,435,000    
Financial Bonds $ 3,487,000    
Minimum [Member]
      
Assumption Duration [Line Items]      
Discount Rate Used in Determining Fair Value of land/lots 13.00%    
Equity Method Investment, Ownership Percentage 33.00%    
Interest Rate Notes Receivable 0.00%    
Maximum [Member]
      
Assumption Duration [Line Items]      
Discount Rate Used in Determining Fair Value of land/lots 16.00%    
Equity Method Investment, Ownership Percentage 50.00%    
Interest Rate Notes Receivable 12.00%