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Segment Information, Nature of Operations, and Certain Concentrations - Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Asset Reconciling Item [Line Items]        
Assets $ 2,515,131 $ 2,351,335    
Cash and cash equivalents 425,316 545,419 $ 866,253 $ 1,153,507
Contract land deposit reserve (42,239) (56,074)    
Homebuilding [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 2,135,581 2,088,019    
Consolidated variable interest entity 1,749 3,590    
Cash and cash equivalents 397,522 514,780    
Deferred taxes 161,805 165,189    
Intangible assets and goodwill 3,982 5,364    
Mortgage Banking [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 379,550 263,316    
Cash and cash equivalents 26,804 30,158    
Operating Segments [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 1,895,779 1,615,009    
Operating Segments [Member] | Homebuilding [Member] | Mid Atlantic [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 994,804 917,689    
Operating Segments [Member] | Homebuilding [Member] | North East [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 133,106 103,631    
Operating Segments [Member] | Homebuilding [Member] | Mid East [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 220,094 192,781    
Operating Segments [Member] | Homebuilding [Member] | South East [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 175,572 144,939    
Operating Segments [Member] | Mortgage Banking [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 372,203 255,969    
Reconciling Items [Member]        
Segment Reporting Asset Reconciling Item [Line Items]        
Assets 619,352 736,326    
Consolidated variable interest entity 1,749 3,590    
Cash and cash equivalents 397,522 514,780    
Deferred taxes 161,805 165,189    
Intangible assets and goodwill 52,909 54,291    
Contract land deposit reserve (42,239) (56,074)    
Consolidation adjustments and other $ 47,606 $ 54,550