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Segment Information, Nature of Operations, and Certain Concentrations - Profit before Taxes (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Profit before taxes | $ 846,911 | $ 661,697 | $ 603,212
Equity-based compensation expense | (44,562) | (43,598) | (54,091)
Corporate interest expense | (24,185) | (21,707) | (23,559)
Homebuilding: |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Profit before taxes | 776,370 | 601,102 | 555,329
Corporate interest expense | (23,037) | (20,621) | (22,918)
Mortgage Banking: |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Profit before taxes | 70,541 | 60,595 | 47,883
Corporate interest expense | (1,148) | (1,086) | (641)
Profit before taxes: |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Profit before taxes | 778,136 | 579,095 | 555,699
Corporate interest expense | (199,586) | (191,146) | (171,860)
Profit before taxes: | Homebuilding: | Mid Atlantic |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Profit before taxes | 398,494 | 301,173 | 322,829
Corporate interest expense | (123,075) | (119,808) | (107,748)
Profit before taxes: | Homebuilding: | North East |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Profit before taxes | 60,218 | 21,947 | 37,914
Corporate interest expense | (16,117) | (18,141) | (16,991)
Profit before taxes: | Homebuilding: | Mid East |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Profit before taxes | 149,639 | 121,166 | 86,336
Corporate interest expense | (29,663) | (28,307) | (27,263)
Profit before taxes: | Homebuilding: | South East |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Profit before taxes | 95,826 | 71,098 | 57,384
Corporate interest expense | (29,583) | (23,804) | (19,217)
Profit before taxes: | Mortgage Banking: |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Profit before taxes | 73,959 | 63,711 | 51,236
Corporate interest expense | (1,148) | (1,086) | (641)
Reconciling items: |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Profit before taxes | 68,775 | 82,602 | 47,513
Contract land deposit reserve adjustment | 1,307 | 10,933 | 13,805
Equity-based compensation expense | (44,562) | (43,598) | (54,091)
Corporate capital allocation charge | 198,384 | 189,992 | 171,170
Unallocated corporate overhead | (89,514) | (89,376) | (83,124)
Consolidation adjustments and other | 26,143 | 35,204 | 22,622
Corporate interest expense | (22,983) | (20,553) | (22,869)
Reconciling items: | Homebuilding: | Mid Atlantic |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Corporate capital allocation charge | 123,028 | 119,758 | 107,705
Reconciling items: | Homebuilding: | North East |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Corporate capital allocation charge | 16,115 | 18,132 | 16,987
Reconciling items: | Homebuilding: | Mid East |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Corporate capital allocation charge | 29,663 | 28,303 | 27,263
Reconciling items: | Homebuilding: | South East |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Corporate capital allocation charge | $ 29,578 | $ 23,799 | $ 19,215

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