Segment Information, Nature of Operations, and Certain Concentrations - Additional Information (Detail)	0 Months Ended	12 Months Ended
Sep. 10, 2012	Dec. 31, 2014 MetropolitanArea
Segment Reporting Information [Line Items]
Number of metropolitan areas Ryan Homes product are sold		27nvr_NumberOfMetropolitanAreasSales
Revenue derived from Washington, D.C metro area		33.00%
Revenue derived from Baltimore, MD metro area.		13.00%
Senior notes interest rate	3.95%
Senior notes maturity	Sep. 15, 2022
Senior Notes due 2022 [Member]
Segment Reporting Information [Line Items]
Senior notes interest rate	3.95%
Senior notes maturity	Sep. 15, 2022
Homebuilding [Member]
Segment Reporting Information [Line Items]
Number of reportable segments		4
Mortgage Banking [Member]
Segment Reporting Information [Line Items]
Number of reportable segments		1

The number of metropolitan areas that Ryan Homes products are sold in.

No definition available.

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- Definition

Percentage of homebuilding revenue derived from Baltimore, MD metro area.

+ References

No definition available.

+ Details

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- Definition

Percentage of homebuilding revenue derived from Washington, D.C. metro area.

+ References

No definition available.

+ Details

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(2))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

+ Details

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