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Segment Information, Nature of Operations, and Certain Concentrations - Profit before Taxes (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Profit before taxes | $ 1,078,033 | $ 1,025,795 | $ 959,732
Equity-based compensation expense (2) | (50,794) | (78,532) | (75,701)
Corporate interest expense | (40,872) | (25,380) | (25,081)
Home Building |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Profit before taxes | 937,960 | 923,879 | 871,106
Corporate interest expense | (39,458) | (24,335) | (24,036)
Mortgage Banking |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Profit before taxes | 140,073 | 101,916 | 88,626
Corporate interest expense | (1,414) | (1,045) | (1,045)
Profit before taxes: |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Profit before taxes | 1,005,479 | 964,075 | 918,859
Corporate interest expense | (240,749) | (225,627) | (215,016)
Profit before taxes: | Home Building | Mid Atlantic |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Profit before taxes | 437,849 | 478,537 | 462,178
Corporate interest expense | (124,486) | (123,178) | (123,908)
Profit before taxes: | Home Building | North East |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Profit before taxes | 50,677 | 51,728 | 69,789
Corporate interest expense | (22,859) | (19,804) | (17,897)
Profit before taxes: | Home Building | Mid East |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Profit before taxes | 168,605 | 173,374 | 175,134
Corporate interest expense | (40,261) | (37,266) | (35,804)
Profit before taxes: | Home Building | South East |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Profit before taxes | 205,029 | 155,144 | 118,296
Corporate interest expense | (51,729) | (44,334) | (36,362)
Profit before taxes: | Mortgage Banking |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Profit before taxes | 143,319 | 105,292 | 93,462
Corporate interest expense | (1,414) | (1,045) | (1,045)
Reconciling items: |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Profit before taxes | 72,554 | 61,720 | 40,873
Contract land deposit reserve adjustment | (24,633) | 1,644 | 783
Equity-based compensation expense (2) | (50,794) | (78,532) | (75,701)
Corporate capital allocation charge | 239,233 | 224,468 | 213,903
Unallocated corporate overhead | (114,921) | (105,125) | (89,973)
Consolidation adjustments and other (3) | 63,025 | 43,486 | 15,829
Corporate interest expense | $ (39,356) | $ (24,221) | $ (23,968)

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