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Financial Instruments - Schedule of Available-for-Sale Investments (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Amortized Cost And Fair Value Debt Securities [Abstract]
Original stated term to maturity of available-for-sale- investments, Less than one year	$ 113,634	$ 113,040
Original stated term to maturity of available-for-sale- investments, One to five years	46,586	39,459
Original stated term to maturity of available-for-sale- investments, Six to ten years		800
Original stated term to maturity of available-for-sale- investments, Greater than ten years	1,028	2,979
Original stated term to maturity of available-for-sale- investments, Total	$ 161,248	$ 156,278

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Amortized cost and fair value debt securities.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Fair value of available-for-sale debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing after the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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