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Segment Disclosures - Income before Taxes (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Income before taxes | $ 218,607 | $ 190,998
Equity-based compensation expense (2) | (19,333) | (9,509)
Corporate interest expense | (6,215) | (6,282)
Home Building [Member] |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Income before taxes | 188,410 | 168,570
Corporate interest expense | (5,993) | (6,007)
Mortgage Banking [Member] |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Income before taxes | 30,197 | 22,428
Corporate interest expense | (222) | (275)
Operating Segments [Member] |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Income before taxes | 210,893 | 179,749
Operating Segments [Member] | Home Building [Member] | Mid Atlantic [Member] |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Income before taxes | 99,364 | 91,047
Operating Segments [Member] | Home Building [Member] | North East [Member] |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Income before taxes | 11,460 | 15,704
Operating Segments [Member] | Home Building [Member] | Mid East [Member] |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Income before taxes | 35,475 | 27,211
Operating Segments [Member] | Home Building [Member] | South East [Member] |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Income before taxes | 35,036 | 23,237
Operating Segments [Member] | Mortgage Banking [Member] |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Income before taxes | 29,558 | 22,550
Corporate and Reconciling Items [Member] |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Income before taxes | 7,714 | 11,249
Contract land deposit reserve adjustment | 950 | 2,128
Equity-based compensation expense (2) | (19,333) | (9,509)
Corporate capital allocation | 54,559 | 50,700
Unallocated corporate overhead | (31,735) | (31,284)
Consolidation adjustments and other | 9,247 | 5,201
Corporate interest expense | (5,974) | (5,987)
Corporate and Reconciling Items [Member] | Home Building [Member] | Mid Atlantic [Member] |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Corporate capital allocation | 30,417 | 30,449
Corporate and Reconciling Items [Member] | Home Building [Member] | North East [Member] |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Corporate capital allocation | 4,727 | 4,180
Corporate and Reconciling Items [Member] | Home Building [Member] | Mid East [Member] |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Corporate capital allocation | 9,015 | 7,973
Corporate and Reconciling Items [Member] | Home Building [Member] | South East [Member] |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Corporate capital allocation | $ 10,400 | $ 8,098

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