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Taxes On Income - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
Corporate tax rate		23.00%	24.00%
Corporate tax rate	23.00%	23.00%	24.00%
Tax benefit related to re-measurement of deferred tax balance			$ 41,100,000
Undistributed earnings of foreign subsidiaries	$ 392,300,000
Unrecognized deferred tax liability on undistributed earnings of foreign subsidiaries	71,200,000
Unrecognized tax benefit liability adjusted within 12 months	65,600,000
Uncertain tax positions interest expense	4,200,000	$ 5,500,000	$ 4,100,000
Uncertain tax positions accrued interest	34,900,000	30,800,000
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 Federal
Operating Loss Carryforwards [Line Items]
U.S. loss carry forward	$ 323,400,000
Operating loss carry forward expiration years	2021
U S State
Operating Loss Carryforwards [Line Items]
Corporate tax rate	21.00%		35.00%
U.S. loss carry forward	$ 81,600,000
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	$ 21,600,000
Research And Development Tax Credit | Maximum
Operating Loss Carryforwards [Line Items]
Operating loss carry forward expiration years	2039
Research And Development Tax Credit | Minimum
Operating Loss Carryforwards [Line Items]
Operating loss carry forward expiration years	2020
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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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 income tax expense (benefit) for remeasurement of deferred tax from change in tax rate pursuant to Tax Cuts and Jobs Act.

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