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Segment Disclosures - Asset (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Segment Reporting, Asset Reconciling Item [Line Items]    
Consolidated variable interest entity $ 16,210 $ 20,182
Cash and cash equivalents 1,071,999 475,566
Deferred taxes 163,815 155,881
Intangible assets 48,927 48,927
Contract land deposit reserve (69,785) (70,333)
Consolidation adjustments and other 48,875 38,481
Reconciling items sub-total 1,280,041 668,704
Consolidated assets 2,480,726 1,779,485
Homebuilding Mid Atlantic [Member]
   
Segment Reporting, Asset Reconciling Item [Line Items]    
Consolidated assets 749,379 626,157
Homebuilding North East [Member]
   
Segment Reporting, Asset Reconciling Item [Line Items]    
Consolidated assets 67,242 55,948
Homebuilding Mid East [Member]
   
Segment Reporting, Asset Reconciling Item [Line Items]    
Consolidated assets 147,367 94,593
Homebuilding South East [Member]
   
Segment Reporting, Asset Reconciling Item [Line Items]    
Consolidated assets 89,217 63,263
Mortgage Banking [Member]
   
Segment Reporting, Asset Reconciling Item [Line Items]    
Consolidated assets 147,480 270,820
Reportable segment [Member]
   
Segment Reporting, Asset Reconciling Item [Line Items]    
Consolidated assets $ 1,200,685 $ 1,110,781