Segment Disclosures - Revenues (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Revenue Reconciling Item [Line Items]
Total consolidated revenues	$ 1,544,492	$ 1,388,183	$ 2,821,584	$ 2,532,209
Homebuilding [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	1,512,714	1,361,741	2,760,301	2,483,245
Homebuilding [Member] \| Mid Atlantic [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	872,148	772,147	1,594,416	1,405,718
Homebuilding [Member] \| North East [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	127,541	108,766	233,771	205,919
Homebuilding [Member] \| Mid East [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	313,237	306,257	556,268	550,534
Homebuilding [Member] \| South East [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	199,788	174,571	375,846	321,074
Mortgage Banking [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Mortgage Banking	$ 31,778	$ 26,442	$ 61,283	$ 48,964

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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