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Segment Information, Nature of Operations, and Certain Concentrations - Corporate Capital Allocation Charge (Detail) - Reconciling items: - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Corporate capital allocation charge | $ 198,384 | $ 189,992 | $ 171,170
Homebuilding: | Mid Atlantic |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Corporate capital allocation charge | 123,028 | 119,758 | 107,705
Homebuilding: | North East |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Corporate capital allocation charge | 16,115 | 18,132 | 16,987
Homebuilding: | Mid East |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Corporate capital allocation charge | 29,663 | 28,303 | 27,263
Homebuilding: | South East |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Corporate capital allocation charge | $ 29,578 | $ 23,799 | $ 19,215

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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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