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Segment Disclosures - Corporate Capital Allocation Charge (Detail) - Corporate and Reconciling Items [Member] - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |
Corporate capital allocation charge | $ 55,438 | $ 51,904 | $ 160,091 | $ 147,737
Home Building [Member] | Mid Atlantic [Member] |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |
Corporate capital allocation charge | 31,733 | 32,025 | 93,682 | 92,154
Home Building [Member] | North East [Member] |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |
Corporate capital allocation charge | 4,565 | 4,244 | 13,325 | 12,191
Home Building [Member] | Mid East [Member] |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |
Corporate capital allocation charge | 9,541 | 7,747 | 26,571 | 22,024
Home Building [Member] | South East [Member] |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |
Corporate capital allocation charge | $ 9,599 | $ 7,888 | $ 26,513 | $ 21,368

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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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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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