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Segment Disclosures - Income before Taxes (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Income before taxes | $ 244,712 | $ 241,586 | $ 463,319 | $ 432,584
Equity-based compensation expense (1) |  |  | (37,910) | (28,104)
Corporate interest expense | (6,301) | (6,329) | (12,516) | (12,611)
Home Building [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Income before taxes | 219,650 | 223,266 | 408,060 | 391,836
Corporate interest expense | (6,033) | (6,047) | (12,026) | (12,054)
Mortgage Banking [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Income before taxes | 25,062 | 18,320 | 55,259 | 40,748
Corporate interest expense | (268) | (282) | (490) | (557)
Operating Segments [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Income before taxes | 232,654 | 220,060 | 443,547 | 399,809
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 | 123,802 | 112,221 | 223,166 | 203,268
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 | 11,563 | 16,777 | 23,023 | 32,481
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 | 40,291 | 42,174 | 75,766 | 69,385
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 | 30,825 | 29,203 | 65,861 | 52,440
Operating Segments [Member] | Mortgage Banking [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Income before taxes | 26,173 | 19,685 | 55,731 | 42,235
Corporate and Reconciling Items [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Income before taxes | 12,058 | 21,526 | 19,772 | 32,775
Equity-based compensation expense (1) | (18,577) | (18,595) | (37,910) | (28,104)
Corporate capital allocation | 56,177 | 53,954 | 110,735 | 104,653
Unallocated corporate overhead | (29,354) | (22,503) | (61,089) | (53,787)
Consolidation adjustments and other | 9,836 | 14,701 | 20,034 | 22,031
Corporate interest expense | (6,024) | (6,031) | (11,998) | (12,018)
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 | 31,378 | 31,501 | 61,794 | 61,949
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 | 4,626 | 4,580 | 9,353 | 8,760
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 | 9,497 | 9,057 | 18,512 | 17,030
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 | $ 10,676 | $ 8,816 | $ 21,076 | $ 16,914

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