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Segment Disclosures - Assets (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Segment Reporting Asset Reconciling Item [Line Items]        
Assets $ 2,742,299 $ 2,643,943    
Cash and cash equivalents 493,761 396,619 $ 318,982 $ 425,316
Contract land deposit reserve (32,034) (31,306)    
Homebuilding [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 2,487,246 2,233,346    
Consolidated variable interest entity 1,248 1,251    
Cash and cash equivalents 482,689 375,748    
Intangible assets and goodwill 2,254 2,599    
Mortgage Banking [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 255,053 410,597    
Cash and cash equivalents 9,862 19,657    
Operating Segments [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 1,995,878 2,021,710    
Operating Segments [Member] | Homebuilding [Member] | Mid Atlantic [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 1,125,721 1,054,779    
Operating Segments [Member] | Homebuilding [Member] | North East [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 137,409 126,720    
Operating Segments [Member] | Homebuilding [Member] | Mid East [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 254,915 222,736    
Operating Segments [Member] | Homebuilding [Member] | South East [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 230,127 214,225    
Operating Segments [Member] | Mortgage Banking [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 247,706 403,250    
Corporate and Reconciling Items [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 746,421 622,233    
Consolidated variable interest entity 1,248 1,251    
Cash and cash equivalents 482,689 375,748    
Deferred taxes 173,611 170,652    
Intangible assets and goodwill 51,181 51,526    
Contract land deposit reserve (32,034) (31,306)    
Consolidation adjustments and other $ 69,726 $ 54,362