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Variable Interest Entities - Total Risk Related to Lot Options (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Organization Consolidation And Presentation Of Financial Statements [Abstract] |  |  |  |
Contract land deposits | $ 350,261 nvr_ContractLandDeposits |  | $ 350,750 nvr_ContractLandDeposits |
Loss reserve on contract land deposits | (55,140)nvr_LossReserveOnContractLandDeposits |  | (56,074)nvr_LossReserveOnContractLandDeposits |
Contract land deposits, net | 295,121 us-gaap_DepositsAssets |  | 294,676 us-gaap_DepositsAssets |
Contingent obligations in the form of letters of credit | 4,938 nvr_LettersOfCreditRelatedToLots |  | 4,674 nvr_LettersOfCreditRelatedToLots |
Contingent specific performance obligations | 1,505 nvr_ContingentSpecificPerformanceObligations | [1] | 1,505 nvr_ContingentSpecificPerformanceObligations | [1]
Total risk of loss | $ 301,564 us-gaap_GuaranteeObligationsMaximumExposure |  | $ 300,855 us-gaap_GuaranteeObligationsMaximumExposure |
[1] | As of both March 31, 2015 and December 31, 2014, the Company was committed to purchase 10 finished lots under specific performance obligations.

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- Definition Contingent specific performance obligations. + References No definition available. + Details
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Balance Type: | credit
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- 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
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- Definition Letters of credit related to contract land deposits. + References No definition available. + Details
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- Definition The reserve account established to account for expected but unspecified losses related to contract land deposits. + References No definition available. + Details
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- Definition Carrying value of amounts transferred to third parties for security purposes that are expected to be returned or applied towards payment in the future. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 + Details
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Balance Type: | debit
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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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- Details
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