Segment Disclosures - Revenues (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 2,283,598	$ 1,620,368	$ 4,325,044	$ 3,202,896
Home Building Segment
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	2,224,560	1,588,758	4,188,271	3,144,465
Home Building Segment | Mid Atlantic
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	1,048,416	839,845	1,984,556	1,613,903
Home Building Segment | North East
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	193,245	98,219	355,438	204,355
Home Building Segment | Mid East
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	478,179	299,955	903,132	620,650
Home Building Segment | South East
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	504,720	350,739	945,145	705,557
Mortgage Banking
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 59,038	$ 31,610	$ 136,773	$ 58,431