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Marketable Investments - Summary of Company's Marketable Investments (Detail) - Corporate Obligations [Member] - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 41,328	$ 47,939
Gross Unrealized Gains	34
Gross Unrealized Losses	(6)	(164)
Market Value	$ 41,356	$ 47,775

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- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

+ References

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