XML 82 R67.htm IDEA: XBRL DOCUMENT
v3.20.4

Equity-Based Compensation, Profit Sharing and Deferred Compensation Plans - Summary of Equity-Based Compensation Plans with Grants Outstanding (Detail) - shares | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Common stock, shares authorized | 60,000,000 | 60,000,000
2010 Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares Authorized | 700,000 |
Options/RSUs Outstanding | 88,000 |
Shares Available to Issue | 0 |
Granted (Shares) | 8,000 |
2014 Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares Authorized | 950,000 |
Options/RSUs Outstanding | 404,000 |
Shares Available to Issue | 126,000 |
Granted (Shares) | 34,000 |
2018 Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares Authorized | 275,000 |
Options/RSUs Outstanding | 120,000 |
Shares Available to Issue | 155,000 |
Granted (Shares) | 1,000 |
RSUs |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Options issued under the plan (in Shares) | 4,000 |
RSUs | 2018 Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Common stock, shares authorized | 40,000 |
Shares Available to Issue | 36,000 |
Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Options issued under the plan (in Shares) | 43,000 |
Granted (Shares) | 43,000 |
Options | 2010 Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Granted (Shares) | 4,000 |
Options | 2014 Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Granted (Shares) | 17,000 |
Options | 2018 Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Granted (Shares) | 1,000 |
Employee Performance Based Stock Option [Member] | 2010 Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Granted (Shares) | 4,000 |
Employee Performance Based Stock Option [Member] | 2014 Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Granted (Shares) | 17,000 |
Employee Performance Based Stock Option [Member] | 2018 Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Granted (Shares) | 0 |
Option Grant Contingent upon Continued Employment or Service as a Director and Achievement of Performance Metric | Performance Based Restricted Stock Unit [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Restricted share units vesting period or option vesting period | 3 years |
Percentage of options vesting rights | 33.00% |
Option Grant Contingent upon Continued Employment or Service as a Director and Achievement of Performance Metric | Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Percentage of options vesting rights | 25.00% |
Option Grant Contingent upon Continued Employment or Service as a Director and Achievement of Performance Metric | Employee Performance Based Stock Option [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Restricted share units vesting period or option vesting period | 4 years |
Percentage of options vesting rights | 25.00% |
Share-based Compensation Award, Tranche Three [Member] | Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Percentage of options vesting rights | 50.00% |
Share-based Compensation Award, Tranche Three [Member] | Employee Performance Based Stock Option [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Percentage of options vesting rights | 50.00% |

X
- Definition Share based compensation arrangement by share based payment award options and restricted share units outstanding number. + References No definition available. + Details
Name: | nvr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndRestrictedShareUnitsOutstandingNumber
Namespace Prefix: | nvr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_CommonStockSharesAuthorized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares authorized for issuance under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares issued under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of vesting of award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
Name: | us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_PlanNameAxis=nvr_TwoThousandTenEquityPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=nvr_TwoThousandFourteenEquityPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=nvr_TwoThousandEighteenEquityPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=nvr_EmployeePerformanceBasedStockOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VestingAxis=us-gaap_ShareBasedCompensationAwardTrancheTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=nvr_PerformanceBasedRestrictedStockUnitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VestingAxis=us-gaap_ShareBasedCompensationAwardTrancheThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |