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Segment Disclosures - Corporate Capital Allocation Charge (Detail) - Corporate and Reconciling Items - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |
Corporate capital allocation charge | $ 64,055 | $ 60,662 | $ 188,638 | $ 177,184
Home Building Segment | Mid Atlantic |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |
Corporate capital allocation charge | 31,057 | 31,383 | 92,788 | 92,720
Home Building Segment | North East |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |
Corporate capital allocation charge | 6,719 | 5,793 | 19,214 | 17,142
Home Building Segment | Mid East |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |
Corporate capital allocation charge | 11,114 | 10,386 | 32,804 | 29,436
Home Building Segment | South East |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |
Corporate capital allocation charge | $ 15,165 | $ 13,100 | $ 43,832 | $ 37,886

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