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Financial Instruments - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financial Instruments [Line Items]
Period cash equivalents and short-term investments have been in continuous unrealized gain (loss) position, years, maximum	1 year
CCKF [Member]
Financial Instruments [Line Items]
Non controlling interest	$ 2.7
Percentage of investment in equity affiliate	30.70%
Gain (loss) from investment in affiliate	$ (0.4)	$ (0.3)	$ (0.9)

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Financial instruments.

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The maximum length of time, in years, that the amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer, are in a continuous unrealized loss/gain position.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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