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Segment Disclosures - Profit before Taxes (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |
Profit before taxes | $ 184,996 | $ 143,791 | $ 396,043 | $ 302,322
Equity-based compensation expense |  |  | (39,874) | (44,874)
Interest charged to interest expense | (6,081) | (5,775) | (17,955) | (17,292)
Homebuilding [Member] |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |
Profit before taxes | 168,874 | 136,511 | 362,706 | 287,805
Interest charged to interest expense | (5,900) | (5,618) | (17,499) | (16,895)
Mortgage Banking [Member] |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |
Profit before taxes | 16,122 | 7,280 | 33,337 | 14,517
Interest charged to interest expense | (181) | (157) | (456) | (397)
Operating Segments [Member] |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |
Profit before taxes | 163,099 | 122,682 | 374,290 | 281,820
Operating Segments [Member] | Homebuilding [Member] | Mid Atlantic [Member] |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |
Profit before taxes | 88,058 | 76,542 | 217,665 | 184,900
Operating Segments [Member] | Homebuilding [Member] | North East [Member] |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |
Profit before taxes | 10,745 | 9,056 | 29,359 | 23,761
Operating Segments [Member] | Homebuilding [Member] | Mid East [Member] |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |
Profit before taxes | 29,958 | 18,374 | 52,607 | 29,241
Operating Segments [Member] | Homebuilding [Member] | South East [Member] |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |
Profit before taxes | 17,372 | 10,093 | 38,812 | 26,034
Operating Segments [Member] | Mortgage Banking [Member] |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |
Profit before taxes | 16,966 | 8,617 | 35,847 | 17,884
Reconciling Items [Member] |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |
Profit before taxes | 21,897 | 21,109 | 21,753 | 20,502
Contract land deposit reserve adjustment | 4,705 | 453 | 11,511 | 4,108
Equity-based compensation expense | (13,571) | (18,233) | (39,874) | (44,874)
Corporate capital allocation | 45,690 | 42,220 | 124,033 | 105,697
Unallocated corporate overhead | (18,055) | (8,179) | (67,803) | (49,652)
Consolidation adjustments and other | 9,147 | 10,464 | 11,477 | 22,093
Interest charged to interest expense | (6,019) | (5,616) | (17,591) | (16,870)
Reconciling Items [Member] | Homebuilding [Member] | Mid Atlantic [Member] |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |
Corporate capital allocation | 28,743 | 27,187 | 78,412 | 67,085
Reconciling Items [Member] | Homebuilding [Member] | North East [Member] |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |
Corporate capital allocation | 4,451 | 3,151 | 11,566 | 8,333
Reconciling Items [Member] | Homebuilding [Member] | Mid East [Member] |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |
Corporate capital allocation | 7,472 | 7,202 | 20,079 | 18,680
Reconciling Items [Member] | Homebuilding [Member] | South East [Member] |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |
Corporate capital allocation | $ 5,024 | $ 4,680 | $ 13,976 | $ 11,599

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