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Real Estate Inventories - Narrative (Details)
3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
community
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Number of communities where development activity had commenced | community   2    
Real estate inventory impairments   $ 10,078,000 $ 0 $ 854,000
Real estate inventories owned $ 3,144,150,000 $ 2,991,379,000 3,144,150,000  
Number of impaired real estate properties | community   4    
Dallas-based homebuilder        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Cash payment to acquire homebuilder 61,500,000      
Real estate inventories owned 63,200,000   63,200,000  
Other assets 5,500,000   5,500,000  
Accounts payable and other accrued liabilities $ 7,200,000   $ 7,200,000  
California        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Real estate inventory impairments   $ 7,000,000.0    
Future Development Community For TRI Pointe Homes in Sacramento, California        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Real estate inventory impairments   $ 7,000,000.0    
Number of impaired real estate properties | community   1    
Future Development Community For TRI Pointe Homes in Sacramento, California | Markets risk and Community-specific risk | Discount rate        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Discount rate (percent)   16.00%    
Trendmaker Homes Community in Houston, Texas        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Real estate inventory impairments   $ 3,100,000    
Number of impaired real estate properties | community   3    
Trendmaker Homes Community in Houston, Texas | Minimum | Markets risk and Community-specific risk | Discount rate        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Discount rate (percent)   10.00%    
Trendmaker Homes Community in Houston, Texas | Maximum | Markets risk and Community-specific risk | Discount rate        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Discount rate (percent)   12.00%