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Income Taxes - Reconciliation between the Benefit (Provision) for Income Taxes at Statutory Rate and Effective Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Federal statutory tax rate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State taxes, net of federal benefit	0.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.10%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	2.30%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Foreign withholding	3.50%immr_EffectiveIncomeTaxRateReconciliationForeignWithholding	8.20%immr_EffectiveIncomeTaxRateReconciliationForeignWithholding	(13.00%)immr_EffectiveIncomeTaxRateReconciliationForeignWithholding
Stock compensation expense	3.80%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	2.50%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	(2.60%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost
Meals & entertainment	0.10%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseMealsAndEntertainment	0.30%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseMealsAndEntertainment	(0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseMealsAndEntertainment
Foreign rate differential	(1.10%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	(1.70%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	(2.80%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Prior year true-up items	(0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes	0.10%us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes	0.10%us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes
Tax reserves	0.80%immr_EffectiveIncomeTaxRateReconciliationTaxReserves	1.30%immr_EffectiveIncomeTaxRateReconciliationTaxReserves	(0.10%)immr_EffectiveIncomeTaxRateReconciliationTaxReserves
Benefit of discontinued operations	0.00%immr_EffectiveIncomeTaxRateReconciliationBenefitOfDiscontinuedOperations	0.00%immr_EffectiveIncomeTaxRateReconciliationBenefitOfDiscontinuedOperations	1.50%immr_EffectiveIncomeTaxRateReconciliationBenefitOfDiscontinuedOperations
Credits	(5.70%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits	(11.00%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits	13.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits
Other	(1.40%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.30%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Valuation allowance	0.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	(1028.30%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	(45.60%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Effective tax rate	34.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations	(993.50%)us-gaap_EffectiveIncomeTaxRateContinuingOperations	(12.10%)us-gaap_EffectiveIncomeTaxRateContinuingOperations

X

- Definition

Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to benefit of discontinued operations which can be suitable for both positive as well as negative value.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to Foreign Withholding which can be suitable for both positive as well as negative value.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to Tax Reserves which can be suitable for both positive as well as negative value.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to meals and entertainment expense.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to equity-based compensation costs.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to revisions of previously reported income tax expense.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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