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Organization and Summary of Significant Accounting Policies - Impact of Adopting ASC 606 on Consolidated Statements of Operations (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2018
Disaggregation of Revenue [Line Items]                        
Sales and marketing                 $ 187,267      
Provision for income taxes                 (90,552) $ (152,267) $ (106,094)  
Net Income (Loss) Attributable to Parent $ 99,382 $ 63,969 $ 63,680 $ 42,880 $ 74,020 $ 72,264 $ 32,714 $ 8,193 $ 269,911 $ 187,191 $ 195,171  
Diluted (in dollars per share) $ 0.70 $ 0.43 $ 0.42 $ 0.28 $ 0.49 $ 0.48 $ 0.21 $ 0.05 $ 1.81 $ 1.21 $ 1.21  
Real estate inventories $ 3,216,059       $ 3,105,553       $ 3,216,059 $ 3,105,553   $ 3,056,236
Deferred tax assets, net 67,768       76,413       67,768 76,413   78,842
Other assets 105,251       48,070       105,251 48,070   87,604
Accrued expenses and other liabilities 335,149       330,882       335,149 330,882    
Retained earnings 1,396,787       1,134,230       1,396,787 1,134,230   1,126,876
Home sales                        
Disaggregation of Revenue [Line Items]                        
Home sales                 3,244,087 2,732,299 $ 2,329,336  
Cost of home sales                 2,536,899 2,173,251 $ 1,836,327  
Calculated under Revenue Guidance in Effect before Topic 606                        
Disaggregation of Revenue [Line Items]                        
Sales and marketing                 159,482      
Provision for income taxes                 (87,871)      
Net Income (Loss) Attributable to Parent                 $ 261,866      
Diluted (in dollars per share)                 $ 1.76      
Real estate inventories 3,258,232       3,105,553       $ 3,258,232 3,105,553    
Deferred tax assets, net 62,656       76,413       62,656 76,413    
Other assets 64,033       48,070       64,033 48,070    
Accrued expenses and other liabilities 335,344               335,344      
Retained earnings 1,392,435       $ 1,134,230       1,392,435 $ 1,134,230    
Calculated under Revenue Guidance in Effect before Topic 606 | Home sales                        
Disaggregation of Revenue [Line Items]                        
Home sales                 3,244,669      
Cost of home sales                 2,575,992      
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606                        
Disaggregation of Revenue [Line Items]                        
Sales and marketing                 27,785      
Provision for income taxes                 2,681      
Net Income (Loss) Attributable to Parent                 $ 8,045      
Diluted (in dollars per share)                 $ 0.05      
Real estate inventories (42,173)               $ (42,173)     (49,317)
Deferred tax assets, net 5,112               5,112     2,429
Other assets 41,218               41,218     39,534
Accrued expenses and other liabilities (195)               (195)      
Retained earnings $ 4,352               4,352     $ (7,354)
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 | Home sales                        
Disaggregation of Revenue [Line Items]                        
Home sales                 (582)      
Cost of home sales                 $ (39,093)