Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Carry forward tax losses	$ 83.7	$ 81.5
Employee stock based compensation	29,200,000	27,600,000
Deferred revenues	5,600,000	10,500,000
Tax credits	23.9	23.2
Other	23,500,000	15,900,000
Deferred tax assets before valuation allowance	165,900,000	158,700,000
Valuation allowance - mainly in respect to carryforward losses	(56,700,000)	(59,200,000)
Deferred tax asset	109,200,000	99,500,000
Intangible assets	(31,300,000)	(21,000,000.0)
Undistributed earnings of subsidiary	(9,900,000)	(9,900,000)
Other	(1,700,000)	(14,200,000)
Deferred tax liability	(42,900,000)	(45,100,000)
Deferred tax asset, net	$ 66.3	$ 54.4

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

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

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

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences, classified as other.

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Amount, before allocation of a valuation allowances, of deferred tax assets attributable to deductible tax credit carryforwards including, but not limited to, research, foreign, general business, alternative minimum tax, and other deductible tax credit carryforwards.

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

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting.

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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 classified as other.

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Amount of deferred tax liability attributable to taxable temporary differences from undistributed earnings of subsidiary and other recognized entity not within country of domicile. Includes, but is not limited to, other basis differences.

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