Name:	itri_ShareBasedCompensationArrangementByShareBasedPaymentAwardFungibleShareProvision
Namespace Prefix:	itri_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

For a multiplier payout feature, which provides for the multiplication of shares earned by a percentage factor as the result of achievement against a market condition, the lower range limit of the multiplier, in percentage terms.

No definition available.

Name:	itri_ShareBasedCompensationArrangementByShareBasedPaymentAwardMarketConditionMultiplierLowerRangeLimit
Namespace Prefix:	itri_
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For a multiplier payout feature, which provides for the multiplication of shares earned by a percentage factor as the result of achievement against a market condition, the upper range limit of the multiplier, in percentage terms.

No definition available.

Name:	itri_ShareBasedCompensationArrangementByShareBasedPaymentAwardMarketConditionMultiplierUpperRangeLimit
Namespace Prefix:	itri_
Data Type:	num:percentItemType
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Period Type:	duration

For awards with a performance condition that results in a variable percentage of shares being earned, relative to the number of awards originally granted, the lower range limit of the variable percentage range.

No definition available.

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Namespace Prefix:	itri_
Data Type:	num:percentItemType
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For awards with a performance condition that results in a variable percentage of shares being earned, relative to the number of awards originally granted, the upper range limit of the variable percentage range.

No definition available.

Name:	itri_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceConditionVestingRangeUpperRangeLimit
Namespace Prefix:	itri_
Data Type:	num:percentItemType
Balance Type:	na
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For awards whereby a variable percentage of shares will ultimately vest, relative to the number of awards originally granted, based upon the combination of multiple performance or market conditions, the lower range limit of the total variable percentage range.

No definition available.

Name:	itri_ShareBasedCompensationArrangementByShareBasedPaymentAwardPossibleTotalPercentageOfSharesVestedLowerRangeLimit
Namespace Prefix:	itri_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

For awards whereby a variable percentage of shares will ultimately vest, relative to the number of awards originally granted, based upon the combination of multiple performance or market conditions, the upper range limit of the total variable percentage range.

No definition available.

Name:	itri_ShareBasedCompensationArrangementByShareBasedPaymentAwardPossibleTotalPercentageOfSharesVestedUpperRangeLimit
Namespace Prefix:	itri_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The number of shares of common stock available for future issuance under the employee stock purchase plan as of the balance sheet date.

No definition available.

Name:	itri_SharesAvailableForIssuanceEmployeeStockPurchasePlan
Namespace Prefix:	itri_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Stock Options Expiration Period in Years from Grant Date

No definition available.

Name:	itri_StockOptionsExpirationPeriod
Namespace Prefix:	itri_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph h

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
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Period Type:	duration

Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

The discount rate from market value on purchase date that participants pay for shares.

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPricePurchaseDate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 65

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
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Period Type:	instant

Other increase (decrease) in number of shares reserved for issuance under non-option equity instrument agreements that is not separately disclosed.

No definition available.

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOther
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

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.