Reconciliation Between Effective Tax Rate and U.S. Statutory Rate (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Income before taxes on income	$ 2,033	$ 7,473	$ 15,747
Theoretical tax at U.S. statutory rate	691	2,541	5,511
Foreign income taxes at rates other than U.S. rate	(489)	(1,057)	(2,023)
Approved and benefited enterprises benefits	(785)	(1,553)	(1,934)
Subpart F	394	633	529
Non-deductible items	723	433	592
Non-taxable items	(230)
Decrease in uncertain tax position	(920)	(73)
Valuation allowance	3,356	(111)	(380)
Other, net	112	(25)	(233)
Taxes on income	$ 2,852us-gaap_IncomeTaxExpenseBenefit	$ 788us-gaap_IncomeTaxExpenseBenefit	$ 2,062us-gaap_IncomeTaxExpenseBenefit
Effective tax rate	140.00%	11.00%	13.00%

Income tax reconciliation changes in uncertain tax positions.

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Income Tax Reconciliation Foreign Income Tax Rate Differential Another

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Income tax reconciliation reduced exempt.

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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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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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