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Segment Disclosures - Profit before Taxes (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Profit before taxes $ 148,684 $ 108,824 $ 211,047 $ 158,531
Equity-based compensation expense     (26,303) (26,641)
Interest charged to interest expense (5,956) (5,723) (11,874) (11,517)
Mortgage Banking [Member]        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Profit before taxes 11,436 6,246 17,215 7,237
Interest charged to interest expense (139) (130) (275) (240)
Operating Segments [Member]        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Profit before taxes 138,139 102,183 211,193 159,138
Operating Segments [Member] | Homebuilding Mid Atlantic [Member]        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Profit before taxes 85,041 67,347 129,607 108,358
Operating Segments [Member] | Homebuilding North East [Member]        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Profit before taxes 12,631 8,398 18,615 14,705
Operating Segments [Member] | Homebuilding Mid East [Member]        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Profit before taxes 15,586 11,116 22,649 10,867
Operating Segments [Member] | Homebuilding South East [Member]        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Profit before taxes 12,625 7,895 21,441 15,941
Operating Segments [Member] | Mortgage Banking [Member]        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Profit before taxes 12,256 7,427 18,881 9,267
Reconciling Items [Member]        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Profit before taxes 10,545 6,641 (146) (607)
Contract land deposit reserve adjustment 5,903 1,672 6,806 3,655
Equity-based compensation expense (12,904) (15,938) (26,303) (26,641)
Corporate capital allocation 41,398 34,511 78,341 63,477
Unallocated corporate overhead (19,764) (15,513) (49,748) (41,473)
Consolidation adjustments and other 1,681 7,488 2,330 11,629
Interest charged to interest expense (5,769) (5,579) (11,572) (11,254)
Reconciling Items [Member] | Homebuilding Mid Atlantic [Member]        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Corporate capital allocation 26,258 21,742 49,667 39,898
Reconciling Items [Member] | Homebuilding North East [Member]        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Corporate capital allocation 3,805 2,733 7,115 5,182
Reconciling Items [Member] | Homebuilding Mid East [Member]        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Corporate capital allocation 6,672 6,180 12,607 11,478
Reconciling Items [Member] | Homebuilding South East [Member]        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Corporate capital allocation $ 4,663 $ 3,856 $ 8,952 $ 6,919