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Long-Term Investments - Amortized Cost and Estimated Fair Value of Available-for-Sale Securities by Contractual Maturities (Detail) $ in Thousands | Dec. 31, 2017 USD ($)
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Available-for-sale Securities, Debt Maturities [Abstract] |
Due in twenty to forty years, Cost | $ 3,000
Due in twenty to forty years, Estimated Fair Value | $ 2,525

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