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Segment Disclosures - Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2014
Segment Reporting Asset Reconciling Item [Line Items]        
Assets $ 2,663,216 $ 2,511,718    
Cash and cash equivalents 262,428 425,316 $ 387,462 $ 545,419
Contract land deposit reserve (38,817) (42,239)    
Homebuilding [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 2,329,213 2,132,168    
Consolidated variable interest entity 1,247 1,749    
Cash and cash equivalents 249,728 397,522    
Intangible assets and goodwill 2,945 3,982    
Mortgage Banking [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 334,003 379,550    
Cash and cash equivalents 11,490 26,804    
Operating Segments [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 2,178,761 1,895,779    
Operating Segments [Member] | Homebuilding [Member] | Mid Atlantic [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 1,223,426 994,804    
Operating Segments [Member] | Homebuilding [Member] | North East [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 145,191 133,106    
Operating Segments [Member] | Homebuilding [Member] | Mid East [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 253,806 220,094    
Operating Segments [Member] | Homebuilding [Member] | South East [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 229,682 175,572    
Operating Segments [Member] | Mortgage Banking [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 326,656 372,203    
Reconciling Items [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 484,455 615,939    
Consolidated variable interest entity 1,247 1,749    
Cash and cash equivalents 249,728 397,522    
Deferred taxes 171,941 161,805    
Intangible assets and goodwill 51,872 52,909    
Contract land deposit reserve (38,817) (42,239)    
Consolidation adjustments and other $ 48,484 $ 44,193