Segment Disclosures - Revenues (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Revenue Reconciling Item [Line Items]
Total consolidated revenues	$ 957,749us-gaap_Revenues	$ 811,310us-gaap_Revenues
Homebuilding Mid Atlantic [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	556,120	465,030
Homebuilding North East [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	82,993	78,792
Homebuilding Mid East [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	185,429	150,648
Homebuilding South East [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	116,996	104,717
Mortgage Banking [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Mortgage Banking	$ 16,211	$ 12,123

The noninterest income derived from mortgage banking activities (fees and commissions), excluding fees earned from servicing third-party assets.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 13

-Article 9

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.13 (d))

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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Period Type:	duration

- Definition

Revenue related to the sale of homes and home building activities including design, development, general contracting, and renovation services for residential buildings, including single-family houses, multifamily housing, townhouses, apartments, and modular housing.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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