Segment Disclosures - Revenues (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Segment Reporting, Revenue Reconciling Item [Line Items]
Consolidated revenues	$ 1,529,414	$ 1,277,092
Homebuilding [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	1,490,093	1,247,587
Homebuilding [Member] \| Mid Atlantic [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	842,496	722,268
Homebuilding [Member] \| North East [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	122,714	106,231
Homebuilding [Member] \| Mid East [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	290,237	243,031
Homebuilding [Member] \| South East [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	234,646	176,057
Mortgage Banking [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Mortgage Banking	$ 39,321	$ 29,505

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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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.

+ References

No definition available.

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