Income Taxes - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Federal statutory tax rate	35.00%	35.00%	35.00%
Cumulative amount of earnings upon which U.S. income taxes have not been provided	$ 1,454.2
Income Tax Holiday [Line Items]
Valuation allowance	17.2	$ 15.2
Unrecognized tax benefits, period increase (decrease)	13.6
Total gross unrecognized tax benefits	106.0	92.4	$ 75.5	$ 74.0
Interest and penalties related to unrecognized tax benefits accrued	3.7	$ 2.9	$ 2.5
Swiss Federal Tax Administration (FTA)
Income Tax Holiday [Line Items]
Tax benefit from tax holiday	$ 10.0
Tax benefit from tax holiday (in dollars per share)	$ 0.25

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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-Name Accounting Standards Codification
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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The amount of income taxes from which a reporting entity is exempt or for which it will receive a reduction in income taxes as a result of the income tax holiday granted by the taxing jurisdiction.

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Per share amount effect of the income tax benefit resulting from the income tax holidays granted by taxing jurisdictions.

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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 unrecognized tax benefits.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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Amount of increase (decrease) in unrecognized tax benefits attributable to uncertain tax positions taken in tax returns.

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