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Segment Disclosures - Income before Taxes (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Income before taxes | $ 249,710 | $ 244,464 | $ 682,294 | $ 585,593
Equity-based compensation expense (2) |  |  | (51,690) | (32,678)
Corporate interest expense | (6,197) | (6,120) | (18,808) | (17,870)
Home Building [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Income before taxes | 224,196 | 226,043 | 616,032 | 534,570
Corporate interest expense | (5,968) | (5,821) | (18,022) | (17,040)
Mortgage Banking [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Income before taxes | 25,514 | 18,421 | 66,262 | 51,023
Corporate interest expense | (229) | (299) | (786) | (830)
Operating Segments [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Income before taxes | 244,093 | 219,354 | 643,902 | 537,265
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 | 115,180 | 109,417 | 318,447 | 274,527
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 | 18,560 | 18,762 | 51,041 | 41,980
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 | 51,744 | 44,990 | 121,129 | 103,135
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 | 31,426 | 26,849 | 83,867 | 64,330
Operating Segments [Member] | Mortgage Banking [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Income before taxes | 27,183 | 19,336 | 69,418 | 53,293
Corporate and Reconciling Items [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Income before taxes | 5,617 | 25,110 | 38,392 | 48,328
Contract land deposit reserve adjustment | (689) | 1,910 | 2,031 | (882)
Equity-based compensation expense (2) | (23,586) | (11,211) | (51,690) | (32,678)
Corporate capital allocation | 55,438 | 51,904 | 160,091 | 147,737
Unallocated corporate overhead | (20,424) | (18,768) | (74,211) | (69,362)
Consolidation adjustments and other | 831 | 7,087 | 20,142 | 20,513
Corporate interest expense | (5,953) | (5,812) | (17,971) | (17,000)
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 | 31,733 | 32,025 | 93,682 | 92,154
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 | 4,565 | 4,244 | 13,325 | 12,191
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 | 9,541 | 7,747 | 26,571 | 22,024
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 | $ 9,599 | $ 7,888 | $ 26,513 | $ 21,368

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