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Segment Disclosures - Profit before Taxes (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Profit before taxes $ 208,968 $ 144,720 $ 341,129 $ 248,032
Equity-based compensation expense     (21,467) (21,378)
Corporate interest expense (5,914) (4,814) (11,750) (9,902)
Homebuilding [Member]        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Profit before taxes 191,337 131,528 308,527 225,182
Corporate interest expense (5,641) (4,554) (11,219) (9,396)
Mortgage Banking [Member]        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Profit before taxes 17,631 13,192 32,602 22,850
Corporate interest expense (273) (260) (531) (506)
Operating Segments [Member]        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Profit before taxes 191,634 129,162 317,910 225,730
Operating Segments [Member] | Homebuilding [Member] | Mid Atlantic [Member]        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Profit before taxes 100,621 63,730 165,109 110,339
Operating Segments [Member] | Homebuilding [Member] | North East [Member]        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Profit before taxes 14,112 5,578 23,218 9,643
Operating Segments [Member] | Homebuilding [Member] | Mid East [Member]        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Profit before taxes 35,986 30,056 58,145 52,789
Operating Segments [Member] | Homebuilding [Member] | South East [Member]        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Profit before taxes 22,911 15,825 37,481 28,611
Operating Segments [Member] | Mortgage Banking [Member]        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Profit before taxes 18,004 13,973 33,957 24,348
Corporate and Reconciling Items [Member]        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Profit before taxes 17,334 15,558 23,219 22,302
Contract land deposit reserve adjustment (2,064) 1,307 (2,792) 2,636
Equity-based compensation expense (10,878) (10,829) (21,467) (21,378)
Corporate capital allocation 49,646 46,259 95,833 90,574
Unallocated corporate overhead (23,360) (26,517) (50,594) (56,026)
Consolidation adjustments and other 9,614 9,877 13,427 15,862
Corporate interest expense (5,624) (4,539) (11,188) (9,366)
Corporate and Reconciling Items [Member] | Homebuilding [Member] | Mid Atlantic [Member]        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Corporate capital allocation 31,005 28,766 60,130 55,951
Corporate and Reconciling Items [Member] | Homebuilding [Member] | North East [Member]        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Corporate capital allocation 4,133 4,447 7,947 9,400
Corporate and Reconciling Items [Member] | Homebuilding [Member] | Mid East [Member]        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Corporate capital allocation 7,535 7,458 14,277 14,157
Corporate and Reconciling Items [Member] | Homebuilding [Member] | South East [Member]        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Corporate capital allocation $ 6,973 $ 5,588 $ 13,479 $ 11,066