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Financial Instruments - Schedule of Available-for-Sale Investments (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Amortized Cost And Fair Value Debt Securities [Abstract]
Original stated term to maturity of available-for-sale- investments, Less than one year	$ 156,657	$ 113,634
Original stated term to maturity of available-for-sale- investments, One to five years	38,845	46,586
Original stated term to maturity of available-for-sale- investments, Greater than ten years	926	1,028
Original stated term to maturity of available-for-sale- investments, Total	$ 196,428	$ 161,248

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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 investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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Fair value of investment in debt security, measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing after tenth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), maturing in next fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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