Segment Disclosures - Revenues (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Revenue Reconciling Item [Line Items]
Total consolidated revenues	$ 1,402,351	$ 1,203,166	$ 3,603,733	$ 3,116,530
Homebuilding [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	1,374,467	1,185,160	3,537,116	3,068,427
Homebuilding [Member] \| Mid Atlantic [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	792,532	702,645	2,094,820	1,825,500
Homebuilding [Member] \| North East [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	120,143	96,015	317,510	267,245
Homebuilding [Member] \| Mid East [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	299,157	257,649	705,670	629,385
Homebuilding [Member] \| South East [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	162,635	128,851	419,116	346,297
Mortgage Banking [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Mortgage Banking	$ 27,884	$ 18,006	$ 66,617	$ 48,103

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 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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- 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

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(e))

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

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- 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

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+ References

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