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Investments - Schedule of Available-for-Sale Investments (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Amortized Cost And Fair Value Debt Securities [Abstract]
Original stated term to maturity of available-for-sale- investments, Less than one year	$ 71,000	$ 77,177
Original stated term to maturity of available-for-sale- investments, One to five years	43,552	44,182
Original stated term to maturity of available-for-sale- investments, Five to ten years		211
Original stated term to maturity of available-for-sale- investments, Greater than ten years	7,723	8,662
Original stated term to maturity of available-for-sale- investments, Total	$ 122,275	$ 130,232

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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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