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Segment Disclosures - Profit before Taxes (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |
Profit before taxes | $ 148,684 | $ 108,824 | $ 211,047 | $ 158,531
Equity-based compensation expense |  |  | (26,303) | (26,641)
Interest charged to interest expense | (5,956) | (5,723) | (11,874) | (11,517)
Mortgage Banking [Member] |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |
Profit before taxes | 11,436 | 6,246 | 17,215 | 7,237
Interest charged to interest expense | (139) | (130) | (275) | (240)
Operating Segments [Member] |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |
Profit before taxes | 138,139 | 102,183 | 211,193 | 159,138
Operating Segments [Member] | Homebuilding Mid Atlantic [Member] |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |
Profit before taxes | 85,041 | 67,347 | 129,607 | 108,358
Operating Segments [Member] | Homebuilding North East [Member] |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |
Profit before taxes | 12,631 | 8,398 | 18,615 | 14,705
Operating Segments [Member] | Homebuilding Mid East [Member] |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |
Profit before taxes | 15,586 | 11,116 | 22,649 | 10,867
Operating Segments [Member] | Homebuilding South East [Member] |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |
Profit before taxes | 12,625 | 7,895 | 21,441 | 15,941
Operating Segments [Member] | Mortgage Banking [Member] |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |
Profit before taxes | 12,256 | 7,427 | 18,881 | 9,267
Reconciling Items [Member] |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |
Profit before taxes | 10,545 | 6,641 | (146) | (607)
Contract land deposit reserve adjustment | 5,903 | 1,672 | 6,806 | 3,655
Equity-based compensation expense | (12,904) | (15,938) | (26,303) | (26,641)
Corporate capital allocation | 41,398 | 34,511 | 78,341 | 63,477
Unallocated corporate overhead | (19,764) | (15,513) | (49,748) | (41,473)
Consolidation adjustments and other | 1,681 | 7,488 | 2,330 | 11,629
Interest charged to interest expense | (5,769) | (5,579) | (11,572) | (11,254)
Reconciling Items [Member] | Homebuilding Mid Atlantic [Member] |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |
Corporate capital allocation | 26,258 | 21,742 | 49,667 | 39,898
Reconciling Items [Member] | Homebuilding North East [Member] |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |
Corporate capital allocation | 3,805 | 2,733 | 7,115 | 5,182
Reconciling Items [Member] | Homebuilding Mid East [Member] |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |
Corporate capital allocation | 6,672 | 6,180 | 12,607 | 11,478
Reconciling Items [Member] | Homebuilding South East [Member] |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |
Corporate capital allocation | $ 4,663 | $ 3,856 | $ 8,952 | $ 6,919

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