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Segment Disclosures - Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Segment Reporting Asset Reconciling Item [Line Items]        
Assets $ 2,570,682 $ 2,351,335    
Cash and cash equivalents 387,462 545,419 $ 466,293 $ 866,253
Contract land deposit reserve (44,532) (56,074)    
Homebuilding [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 2,264,314 2,088,019    
Consolidated variable interest entity 1,799 3,590    
Cash and cash equivalents 375,886 514,780    
Intangible assets and goodwill 4,327 5,364    
Mortgage Banking [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 306,368 263,316    
Cash and cash equivalents 10,407 30,158    
Operating Segments [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 1,958,656 1,615,009    
Operating Segments [Member] | Homebuilding [Member] | Mid Atlantic [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 1,094,256 917,689    
Operating Segments [Member] | Homebuilding [Member] | North East [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 135,579 103,631    
Operating Segments [Member] | Homebuilding [Member] | Mid East [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 249,269 192,781    
Operating Segments [Member] | Homebuilding [Member] | South East [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 180,531 144,939    
Operating Segments [Member] | Mortgage Banking [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 299,021 255,969    
Reconciling Items [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 612,026 736,326    
Consolidated variable interest entity 1,799 3,590    
Cash and cash equivalents 375,886 514,780    
Deferred taxes 172,032 165,189    
Intangible assets and goodwill 53,254 54,291    
Contract land deposit reserve (44,532) (56,074)    
Consolidation adjustments and other $ 53,587 $ 54,550