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Segment Disclosures - Profit before Taxes (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |
Profit before taxes | $ 185,003 | $ 184,996 | $ 433,035 | $ 396,043
Equity-based compensation expense |  |  | (32,459) | (39,874)
Corporate interest expense | (5,624) | (6,081) | (15,526) | (17,955)
Homebuilding [Member] |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |
Profit before taxes | 167,657 | 168,874 | 392,839 | 362,706
Corporate interest expense | (5,338) | (5,900) | (14,734) | (17,499)
Mortgage Banking [Member] |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |
Profit before taxes | 17,346 | 16,122 | 40,196 | 33,337
Corporate interest expense | (286) | (181) | (792) | (456)
Operating Segments [Member] |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |
Profit before taxes | 159,250 | 163,099 | 384,980 | 374,290
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 | 81,137 | 88,058 | 191,476 | 217,665
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 | 8,711 | 10,745 | 18,354 | 29,359
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 | 34,699 | 29,958 | 87,488 | 52,607
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 | 16,548 | 17,372 | 45,159 | 38,812
Operating Segments [Member] | Mortgage Banking [Member] |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |
Profit before taxes | 18,155 | 16,966 | 42,503 | 35,847
Reconciling Items [Member] |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |
Profit before taxes | 25,753 | 21,897 | 48,055 | 21,753
Contract land deposit reserve adjustment | 785 | 4,705 | 3,421 | 11,511
Equity-based compensation expense | (11,081) | (13,571) | (32,459) | (39,874)
Corporate capital allocation | 50,032 | 45,690 | 140,606 | 124,033
Unallocated corporate overhead | (18,459) | (18,055) | (74,485) | (67,803)
Consolidation adjustments and other | 9,798 | 9,147 | 25,660 | 11,477
Corporate interest expense | (5,322) | (6,019) | (14,688) | (17,591)
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 | 31,960 | 28,743 | 87,911 | 78,412
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 | 4,572 | 4,451 | 13,972 | 11,566
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 | 7,366 | 7,472 | 21,523 | 20,079
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 | $ 6,134 | $ 5,024 | $ 17,200 | $ 13,976

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