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))
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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Segment Information, Nature of Operations, and Certain Concentrations - Revenues (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting, Revenue Reconciling Item [Line Items]
Consolidated revenues									$ 6,305,840	$ 5,822,544	$ 5,159,008
Homebuilding:
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 1,781,494	$ 1,633,726	$ 1,512,714	$ 1,247,587	$ 1,718,527	$ 1,507,451	$ 1,361,741	$ 1,121,504	6,175,521	5,709,223	5,065,200
Homebuilding: \| Mid Atlantic
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									3,543,687	3,319,776	3,022,789
Homebuilding: \| North East
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									517,141	462,385	432,145
Homebuilding: \| Mid East
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									1,250,165	1,192,472	1,014,920
Homebuilding: \| South East
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									864,528	734,590	595,346
Mortgage Banking:
Segment Reporting, Revenue Reconciling Item [Line Items]
Mortgage Banking	$ 34,842	$ 34,194	$ 31,778	$ 29,505	$ 34,239	$ 30,118	$ 26,442	$ 22,522	$ 130,319	$ 113,321	$ 93,808