Segment Disclosures - Revenues (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting, Revenue Reconciling Item [Line Items]
Consolidated revenues	$ 1,787,305	$ 1,544,492	$ 3,316,719	$ 2,821,584
Homebuilding [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	1,750,463	1,512,714	3,240,556	2,760,301
Homebuilding [Member] \| Mid Atlantic [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	973,677	872,148	1,816,173	1,594,416
Homebuilding [Member] \| North East [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	147,618	127,541	270,332	233,771
Homebuilding [Member] \| Mid East [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	363,288	313,237	653,525	556,268
Homebuilding [Member] \| South East [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	265,880	199,788	500,526	375,846
Mortgage Banking [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Mortgage Banking	$ 36,842	$ 31,778	$ 76,163	$ 61,283

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=63488584&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=63488584&loc=d3e20235-122688

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+ References

No definition available.

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