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Variable Interest Entities - Additional Information (Detail) $ in Thousands	Sep. 30, 2017 USD ($) lot	Dec. 31, 2016 USD ($)
Variable Interest Entity [Line Items]
Contract land deposits in cash	$ 397,330	$ 411,150
Variable Interest Entities [Member]
Variable Interest Entity [Line Items]
Maximum range of deposits required under the purchase agreements	10.00%
Power of developers equity holders to direct operating activities of development entity	100.00%
Lots controlled by NVR | lot	79,700
Contract land deposits in cash under lot purchase Agreements	$ 385,600
Letters of credit related to lots	$ 2,100
Contract on Raw Ground with Landowners [Member]
Variable Interest Entity [Line Items]
Lots controlled by NVR | lot	9,700
Contract land deposits in cash	$ 11,700
Letters of credit related to land contract	200
Refundable deposits and letters of credit	$ 5,200

X

- Definition

The gross amount as of the balance sheet date of deposits paid to secure the right to purchase finished lots.

+ References

No definition available.

+ Details

Name:	nvr_ContractLandDeposits
Namespace Prefix:	nvr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The gross amount as of the balance sheet date of deposits paid to secure the right to purchase finished lots under lot purchase agreements.

+ References

No definition available.

+ Details

Name:	nvr_ContractLandDepositsOnLotPurchaseAgreements
Namespace Prefix:	nvr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Letter of credit on lot purchase agreements.

+ References

No definition available.

+ Details

Name:	nvr_LetterOfCreditOnLotPurchaseAgreements
Namespace Prefix:	nvr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Letters of credit issued for deposits on raw land contracts.

+ References

No definition available.

+ Details

Name:	nvr_LettersOfCreditOnRawLandContracts
Namespace Prefix:	nvr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Lots controlled by NVR.

+ References

No definition available.

+ Details

Name:	nvr_LotsControlledByCompany
Namespace Prefix:	nvr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Maximum percentage of deposits required under the purchase agreements.

+ References

No definition available.

+ Details

Name:	nvr_MaximumPercentageOfDepositsRequiredUnderPurchaseAgreements
Namespace Prefix:	nvr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Power of developer's equity holders to direct operating activities of the development entity.

+ References

No definition available.

+ Details

Name:	nvr_PowerOfDevelopersEquityHoldersToDirectOperatingActivitiesOfDevelopmentEntity
Namespace Prefix:	nvr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Portion of deposits and letters of credit made on raw land contracts which may be refundable.

+ References

No definition available.

+ Details

Name:	nvr_RefundableDeposits
Namespace Prefix:	nvr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

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.

+ Details

Name:	us-gaap_VariableInterestEntityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=nvr_RawGroundContractsVariableInterestEntityNotPrimaryBeneficiaryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: