Taxes on Income - Deferred Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Provision for vacation pay	$ 801orbk_DeferredTaxAssetsVacationProvision	$ 682orbk_DeferredTaxAssetsVacationProvision
Accrued severance pay	2,860	3,365
Carryforward tax losses	57,426	63,276
Research and development costs	5,280	5,438
Taxes on undistributed income of Israeli subsidiary	(2,148)	(2,406)
Intangible assets	(19,135)	(4,160)
Other	1,705us-gaap_DeferredTaxAssetsOther	2,851us-gaap_DeferredTaxAssetsOther
Total - Gross	46,789	69,046
Less - valuation allowance	45,694	48,228	51,595	26,068
Total - Net	$ 1,095us-gaap_DeferredTaxAssetsLiabilitiesNet	$ 20,818us-gaap_DeferredTaxAssetsLiabilitiesNet

Deferred Tax Assets Liabilities Net Before Valuation Allowances

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Deferred Tax Assets Liabilities Valuation Allowance Amount

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Deferred Tax Assets Vacation Provision

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from in-process research and development costs expensed in connection with a business combination.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed.

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The tax effect as of the balance sheet date of the amount of future tax deductions arising from all unused tax credit carryforwards which have been reduced by a valuation allowance.

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-Glossary Carryforwards

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from severance costs.

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Amount of deferred tax liability attributable to taxable temporary differences from intangible assets other than goodwill.

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Amount of deferred tax liability attributable to taxable temporary differences from undistributed earnings of subsidiaries and other recognized entities not within the country of domicile of the entity.

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