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Segment Disclosures - Income before Taxes (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Income before taxes | $ 434,127 | $ 321,457 | $ 1,163,598 | $ 692,663
Contract land deposit reserve adjustment | 4,100 | (4,800) | 17,500 | 32,500
Equity-based compensation expense |  |  | (42,859) | (35,565)
Corporate interest expense | (13,243) | (11,687) | (39,910) | (27,698)
Home Building Segment |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Income before taxes | 395,108 | 269,645 | 1,026,790 | 614,369
Corporate interest expense | (12,838) | (11,309) | (38,694) | (26,689)
Mortgage Banking |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Income before taxes | 39,019 | 51,812 | 136,808 | 78,294
Corporate interest expense | (405) | (378) | (1,216) | (1,009)
Operating Segments |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Income before taxes | 478,347 | 269,525 | 1,162,978 | 642,020
Operating Segments | Home Building Segment | Mid Atlantic |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Income before taxes | 222,504 | 104,700 | 526,052 | 284,440
Operating Segments | Home Building Segment | North East |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Income before taxes | 33,885 | 14,272 | 70,622 | 31,081
Operating Segments | Home Building Segment | Mid East |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Income before taxes | 81,021 | 45,109 | 189,849 | 103,575
Operating Segments | Home Building Segment | South East |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Income before taxes | 100,688 | 52,554 | 236,272 | 142,463
Operating Segments | Mortgage Banking |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Income before taxes | 40,249 | 52,890 | 140,183 | 80,461
Corporate and Reconciling Items |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Income before taxes | (44,220) | 51,932 | 620 | 50,643
Contract land deposit reserve adjustment | 4,126 | 4,867 | 17,500 | (31,208)
Equity-based compensation expense | (15,009) | (13,639) | (42,859) | (35,565)
Corporate capital allocation | 64,055 | 60,662 | 188,638 | 177,184
Unallocated corporate overhead | (27,801) | (26,915) | (101,605) | (87,912)
Consolidation adjustments and other (3) | (56,786) | 38,244 | (22,456) | 54,769
Corporate interest expense | (12,805) | (11,287) | (38,598) | (26,625)
Corporate and Reconciling Items | Home Building Segment | Mid Atlantic |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Corporate capital allocation | 31,057 | 31,383 | 92,788 | 92,720
Corporate and Reconciling Items | Home Building Segment | North East |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Corporate capital allocation | 6,719 | 5,793 | 19,214 | 17,142
Corporate and Reconciling Items | Home Building Segment | Mid East |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Corporate capital allocation | 11,114 | 10,386 | 32,804 | 29,436
Corporate and Reconciling Items | Home Building Segment | South East |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Corporate capital allocation | $ 15,165 | $ 13,100 | $ 43,832 | $ 37,886

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