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Segment Information, Nature of Operations, and Certain Concentrations - Corporate Capital Allocation Charge (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Corporate Reconciling Items And Eliminations [Member] |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Corporate capital allocation charge | $ (252,787) | $ (239,233) | $ (224,468)
Corporate Reconciling Items And Eliminations [Member] | Home Building | Mid Atlantic |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Corporate capital allocation charge | (124,316) | (124,426) | (123,130)
Corporate Reconciling Items And Eliminations [Member] | Home Building | North East |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Corporate capital allocation charge | (25,431) | (22,850) | (19,755)
Corporate Reconciling Items And Eliminations [Member] | Home Building | Mid East |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Corporate capital allocation charge | (43,686) | (40,256) | (37,263)
Corporate Reconciling Items And Eliminations [Member] | Home Building | South East |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Corporate capital allocation charge | (59,354) | (51,701) | (44,320)
Reconciling items: |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Corporate capital allocation charge | $ (252,787) | $ (239,233) | $ (224,468)

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