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Taxes On Income - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2013	Dec. 31, 2010
Operating Loss Carryforwards [Line Items]
Corporate tax rate	23.00%	24.00%	25.00%
Corporate tax rate	23.00%	24.00%	25.00%
Tax benefit related to re-measurement of deferred tax balance		$ 41,084,000
Undistributed earnings of foreign subsidiaries	$ 357,298,000
Unrecognized deferred tax liability on undistributed earnings of foreign subsidiaries	60,811,000
Unrecognized tax benefit liability adjusted within 12 months	56,702,000
Uncertain tax positions interest expense	5,547,000	4,168,000	$ 6,025,000
Uncertain tax positions accrued interest	30,766,000	25,219,000
Penalties accrued	$ 0	$ 0
Maximum
Operating Loss Carryforwards [Line Items]
Dividend income tax rate				20.00%
Minimum
Operating Loss Carryforwards [Line Items]
Dividend income tax rate				15.00%
U.S.
Operating Loss Carryforwards [Line Items]
Corporate tax rate		35.00%
U.S. | Scenario, Plan
Operating Loss Carryforwards [Line Items]
Corporate tax rate	21.00%
U S Federal
Operating Loss Carryforwards [Line Items]
U.S. loss carry forward	$ 395,236,000
Operating loss carry forward expiration years	2020
U S State
Operating Loss Carryforwards [Line Items]
U.S. loss carry forward	$ 96,380,000
U S State | Maximum
Operating Loss Carryforwards [Line Items]
Operating loss carry forward expiration years	2034
U S State | Minimum
Operating Loss Carryforwards [Line Items]
Operating loss carry forward expiration years	2020
Research And Development Tax Credit
Operating Loss Carryforwards [Line Items]
U.S. loss carry forward	$ 20,270,000
Research And Development Tax Credit | Maximum
Operating Loss Carryforwards [Line Items]
Operating loss carry forward expiration years	2038
Research And Development Tax Credit | Minimum
Operating Loss Carryforwards [Line Items]
Operating loss carry forward expiration years	2019
Tax Year 2012
Operating Loss Carryforwards [Line Items]
Enacted effective income tax rate					16.00%
Technological Preferred Enterprise
Operating Loss Carryforwards [Line Items]
Enacted effective income tax rate		12.00%

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- Definition

This element represents the amount of interest expense accrued as of the date of the statement of financial position for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount that might be imposed under tax return audit of the entity.

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The portion of the domestic federal statutory income tax rate and the taxable income tax.

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The portion of the difference between the domestic federal statutory income tax rate and the expected income tax expense or benefit that is attributable to reduced tax rates (resulting from the effect of "Approved, Privileged or Preferred Enterprise" status).

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This element represents interest expense recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount that might be imposed under tax return audit of the entity.

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Operating loss carryforward expiration date.

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Amount of income tax expense (benefit) for remeasurement of deferred tax from change in tax rate pursuant to Tax Cuts and Jobs Act of 2017.

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The portion of the difference between the dividend amount and domestic federal statutory income tax attributable to the deduction for dividends paid under enacted tax laws.

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Amount of deferred tax liability not recognized because of the exceptions to comprehensive recognition of deferred taxes related to undistributed earnings of foreign subsidiaries.

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

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date.

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Amount of undistributed earnings of foreign subsidiaries intended to be permanently reinvested outside the country of domicile.

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Amount of statutory penalties accrued for a tax position claimed or expected to be claimed by the entity, in its tax return.

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