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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, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |  |
Corporate capital allocation charge | $ 50,032 | $ 45,690 | $ 140,606 | $ 124,033
Homebuilding [Member] | Mid Atlantic [Member] |  |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |  |
Corporate capital allocation charge | 31,960 | 28,743 | 87,911 | 78,412
Homebuilding [Member] | North East [Member] |  |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |  |
Corporate capital allocation charge | 4,572 | 4,451 | 13,972 | 11,566
Homebuilding [Member] | Mid East [Member] |  |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |  |
Corporate capital allocation charge | 7,366 | 7,472 | 21,523 | 20,079
Homebuilding [Member] | South East [Member] |  |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |  |
Corporate capital allocation charge | $ 6,134 | $ 5,024 | $ 17,200 | $ 13,976

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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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