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Segment Information, Nature of Operations, and Certain Concentrations - Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting, Asset Reconciling Item [Line Items]        
Assets $ 3,165,933 $ 2,989,279    
Cash and cash equivalents 732,248 689,557 $ 416,037 $ 450,794
Contract land deposit reserve (29,216) (29,999)    
Homebuilding:        
Segment Reporting, Asset Reconciling Item [Line Items]        
Assets 2,641,511 2,584,880    
Cash and cash equivalents 688,783 645,087    
Deferred taxes 112,333 111,953    
Mortgage Banking:        
Segment Reporting, Asset Reconciling Item [Line Items]        
Assets 524,422 404,399    
Cash and cash equivalents 23,092 21,707    
Profit before taxes:        
Segment Reporting, Asset Reconciling Item [Line Items]        
Assets 2,303,723 2,160,009    
Profit before taxes: | Homebuilding: | Mid Atlantic        
Segment Reporting, Asset Reconciling Item [Line Items]        
Assets 1,018,953 1,079,225    
Profit before taxes: | Homebuilding: | North East        
Segment Reporting, Asset Reconciling Item [Line Items]        
Assets 144,412 143,008    
Profit before taxes: | Homebuilding: | Mid East        
Segment Reporting, Asset Reconciling Item [Line Items]        
Assets 290,815 263,019    
Profit before taxes: | Homebuilding: | South East        
Segment Reporting, Asset Reconciling Item [Line Items]        
Assets 332,468 277,705    
Profit before taxes: | Mortgage Banking:        
Segment Reporting, Asset Reconciling Item [Line Items]        
Assets 517,075 397,052    
Reconciling items:        
Segment Reporting, Asset Reconciling Item [Line Items]        
Assets 862,210 829,270    
Cash and cash equivalents 688,783 645,087    
Deferred taxes 112,333 111,953    
Intangible assets and goodwill 49,989 50,144    
Contract land deposit reserve (29,216) (29,999)    
Consolidation adjustments and other $ 40,321 $ 52,085