Segment Information, Nature of Operations, and Certain Concentrations - Profit before Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Profit before taxes	$ 1,590,403	$ 1,078,033	$ 1,025,795
Equity-based compensation expense (2)	(58,234)	(50,794)	(78,532)
Corporate interest expense	(53,117)	(40,872)	(25,380)
Home Building
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Profit before taxes	1,418,799	937,960	923,879
Corporate interest expense	(51,530)	(39,458)	(24,335)
Mortgage Banking
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Profit before taxes	171,604	140,073	101,916
Corporate interest expense	(1,587)	(1,414)	(1,045)
Profit before taxes:
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Profit before taxes	1,618,362	1,005,479	964,075
Corporate interest expense	(254,511)	(240,749)	(225,627)
Profit before taxes: | Home Building | Mid Atlantic
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Profit before taxes	734,941	437,849	478,537
Corporate interest expense	(124,385)	(124,486)	(123,178)
Profit before taxes: | Home Building | North East
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Profit before taxes	105,432	50,677	51,728
Corporate interest expense	(25,463)	(22,859)	(19,804)
Profit before taxes: | Home Building | Mid East
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Profit before taxes	271,756	168,605	173,374
Corporate interest expense	(43,695)	(40,261)	(37,266)
Profit before taxes: | Home Building | South East
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Profit before taxes	329,982	205,029	155,144
Corporate interest expense	(59,381)	(51,729)	(44,334)
Profit before taxes: | Mortgage Banking
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Profit before taxes	176,251	143,319	105,292
Corporate interest expense	(1,587)	(1,414)	(1,045)
Reconciling items:
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Profit before taxes	(27,959)	72,554	61,720
Contract land deposit reserve adjustment	22,163	(24,633)	1,644
Equity-based compensation expense (2)	(58,234)	(50,794)	(78,532)
Corporate capital allocation charge	252,787	239,233	224,468
Unallocated corporate overhead	(139,611)	(114,921)	(105,125)
Consolidation adjustments and other (4)	(53,671)	63,025	43,486
Corporate interest expense	$ (51,393)	$ (39,356)	$ (24,221)