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Long-Term Investments - Amortized Cost and Estimated Fair Value of Failed Auction Security by Contractual Maturity (Detail) $ in Thousands	Mar. 31, 2018 USD ($)
Available-for-sale Securities, Debt Maturities [Abstract]
Due in twenty-six years, Cost	$ 3,000
Due in twenty-six years, Estimated Fair Value	$ 2,548

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- References

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- Definition

Available for sale securities debt maturities year twenty six amortized cost basis.

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No definition available.

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- Definition

Available for sale securities debt maturities year twenty six fair value.

+ References

No definition available.

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