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Property and Equipment Net (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Leasehold improvements	$ 10,511	$ 10,554
Property and equipment, gross	153,997	137,471
Accumulated depreciation	76,230	75,612
Property and equipment, net	77,767	61,859
Computers and peripheral equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	61,343	58,995
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	7,934	7,742
Building
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 74,209	$ 60,180

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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Amount before accumulated depreciation of additions or improvements to assets held under a lease arrangement.

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+ References

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