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Segment Disclosures - Assets (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Segment Reporting Asset Reconciling Item [Line Items]        
Assets $ 2,918,087 $ 2,643,943    
Cash and cash equivalents 529,313 396,619 $ 364,494 $ 425,316
Contract land deposit reserve (34,098) (31,306)    
Homebuilding [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 2,634,176 2,233,346    
Consolidated variable interest entity 1,243 1,251    
Cash and cash equivalents 518,482 375,748    
Intangible assets and goodwill 1,908 2,599    
Mortgage Banking [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 283,911 410,597    
Cash and cash equivalents 9,632 19,657    
Operating Segments [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 2,140,609 2,021,710    
Operating Segments [Member] | Homebuilding [Member] | Mid Atlantic [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 1,177,147 1,054,779    
Operating Segments [Member] | Homebuilding [Member] | North East [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 148,272 126,720    
Operating Segments [Member] | Homebuilding [Member] | Mid East [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 274,846 222,736    
Operating Segments [Member] | Homebuilding [Member] | South East [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 263,780 214,225    
Operating Segments [Member] | Mortgage Banking [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 276,564 403,250    
Corporate and Reconciling Items [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 777,478 622,233    
Consolidated variable interest entity 1,243 1,251    
Cash and cash equivalents 518,482 375,748    
Deferred taxes 176,401 170,652    
Intangible assets and goodwill 50,835 51,526    
Contract land deposit reserve (34,098) (31,306)    
Consolidation adjustments and other $ 64,615 $ 54,362