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Segment Disclosures - Corporate Capital Allocation Charge (Detail) - Reconciling Items [Member] - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |  |
Corporate capital allocation charge | $ 45,690 | $ 42,220 | $ 124,033 | $ 105,697
Homebuilding [Member] | Mid Atlantic [Member] |  |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |  |
Corporate capital allocation charge | 28,743 | 27,187 | 78,412 | 67,085
Homebuilding [Member] | North East [Member] |  |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |  |
Corporate capital allocation charge | 4,451 | 3,151 | 11,566 | 8,333
Homebuilding [Member] | Mid East [Member] |  |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |  |
Corporate capital allocation charge | 7,472 | 7,202 | 20,079 | 18,680
Homebuilding [Member] | South East [Member] |  |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |  |
Corporate capital allocation charge | $ 5,024 | $ 4,680 | $ 13,976 | $ 11,599

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- Definition The corporate capital allocation charge is eliminated in consolidation and is based on the segment’s average net assets employed. + References No definition available. + Details
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