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Related Party Transactions Related Party Transactions - Text (Details)
9 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
a
Lot
Sep. 30, 2017
USD ($)
Sep. 30, 2019
USD ($)
a
Lot
Dec. 31, 2017
USD ($)
Related Party Transaction [Line Items]        
Gain of sale of assets $ 27,800,000 $ 113,400,000 $ 3,000,000 $ 113,400,000
Income (Loss) from Equity Method Investments $ 4,800,000 $ 10,900,000 $ 500,000 $ 17,800,000
Number of Units in Real Estate Property | Lot 20,100   38,300  
Number of Lots Sold 1,024   4,132 937
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest $ 43,500,000     $ 50,100,000
Deferred Revenue 11,600,000   $ 9,300,000  
Real estate 498,000,000   1,028,900,000  
Due to Related Parties, Current 3,300,000   2,200,000  
Related Party Transaction, Purchase Obligation from Parent 522,200,000   953,800,000  
D.R. Horton, Inc. [Member]        
Related Party Transaction [Line Items]        
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party 900,000   2,100,000  
Related Party Transaction, Purchases from Related Party 600,000   2,400,000  
Deferred Revenue, Period Increase (Decrease) (6,400,000)   4,000,000  
General and Administrative Expense | D.R. Horton, Inc. [Member]        
Related Party Transaction [Line Items]        
Related Party Transaction, Expenses from Transactions with Related Party $ 900,000   $ 1,400,000  
D.R. Horton, Inc. [Member]        
Related Party Transaction [Line Items]        
Number of Lots Sold 642   3,728 26
Revenue from Related Parties $ 43,600,000   $ 311,700,000 $ 1,200,000
Under Contract [Member] | D.R. Horton, Inc. [Member]        
Related Party Transaction [Line Items]        
Number of Units in Real Estate Property | Lot 5,500   12,800  
Related Party Deposit Liabilities $ 45,300,000   $ 88,700,000  
Right of First Offer [Member] | D.R. Horton, Inc. [Member]        
Related Party Transaction [Line Items]        
Number of Units in Real Estate Property | Lot 8,100   10,600  
Land and Land Improvements [Member]        
Related Party Transaction [Line Items]        
Real estate $ 463,100,000   $ 1,011,800,000  
Land [Member]        
Related Party Transaction [Line Items]        
Real estate $ 34,900,000   $ 17,100,000  
Land [Member] | D.R. Horton, Inc. [Member]        
Related Party Transaction [Line Items]        
Number of Lots Sold 79   290 96
Revenue from Related Parties $ 2,000,000   $ 10,900,000 $ 4,000,000
Other Expense [Member] | D.R. Horton, Inc. [Member]        
Related Party Transaction [Line Items]        
Related Party Transaction, Amounts of Transaction 15,200,000   13,100,000  
Deposits [Member] | D.R. Horton, Inc. [Member]        
Related Party Transaction [Line Items]        
Related Party Transaction, Amounts of Transaction 21,200,000   $ 34,500,000  
Equity Method Investments [Member] | Other Customer [Member]        
Related Party Transaction [Line Items]        
Area of Land | a     63  
Proceeds from Sale of Real Estate     $ 44,200,000  
Lm Land Holdings [Member]        
Related Party Transaction [Line Items]        
Income (Loss) from Equity Method Investments $ 6,400,000      
Lm Land Holdings [Member] | Equity Method Investments [Member] | D.R. Horton, Inc. [Member]        
Related Party Transaction [Line Items]        
Equity Method Investment, Ownership Percentage 37.50%      
Income (Loss) from Equity Method Investments $ 2,500,000      
Area of Land | a 40      
Proceeds from Sale of Real Estate $ 7,800,000      
Real Estate | Residential Real Estate [Member]        
Related Party Transaction [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax $ 72,000,000   351,700,000 $ 83,900,000
Reimbursement From Parent [Member] | D.R. Horton, Inc. [Member]        
Related Party Transaction [Line Items]        
Related Party Transaction, Amounts of Transaction     400,000  
Contract Termination [Member] | D.R. Horton, Inc. [Member]        
Related Party Transaction [Line Items]        
Related Party Transaction, Amounts of Transaction     $ 2,100,000  
Maximum | D.R. Horton, Inc. [Member]        
Related Party Transaction [Line Items]        
Related Party Transaction, Rate     16.00%  
Minimum | D.R. Horton, Inc. [Member]        
Related Party Transaction [Line Items]        
Related Party Transaction, Rate     12.00%