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Represents the amount of increase (reduction) of the contingent consideration liability during the period related to re-measurement of fair value.

No definition available.

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Data Type:	xbrli:monetaryItemType
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Represents the amount of reduction of liability for payments made, effecting a change in the contingent consideration liability during the period.

No definition available.

Name:	nvee_BusinessCombinationContingentConsiderationLiabilityReductionOfLiabilityForPaymentsMade
Namespace Prefix:	nvee_
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Balance Type:	debit
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Commitments and Contingencies Disclosure [Roll Forward]

No definition available.

Name:	nvee_CommitmentsandContingenciesDisclosureRollForward
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Amount of liability recognized arising from contingent consideration in a business combination.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled within one year or the normal operating cycle, if longer.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled beyond one year or the normal operating cycle, if longer.