Segment Disclosures - Revenues (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Revenue Reconciling Item [Line Items]
Total consolidated revenues	$ 1,537,569	$ 1,402,351	$ 4,069,778	$ 3,603,733
Homebuilding [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	1,507,451	1,374,467	3,990,696	3,537,116
Homebuilding [Member] \| Mid Atlantic [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	873,490	792,532	2,279,207	2,094,820
Homebuilding [Member] \| North East [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	123,754	120,143	329,674	317,510
Homebuilding [Member] \| Mid East [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	327,387	299,157	877,921	705,670
Homebuilding [Member] \| South East [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	182,820	162,635	503,894	419,116
Mortgage Banking [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Mortgage Banking	$ 30,118	$ 27,884	$ 79,082	$ 66,617

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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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=63488584&loc=d3e20235-122688

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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=63488584&loc=d3e20235-122688

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+ References

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