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Marketable Investments - Summary of Company's Marketable Investments (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Market Value	$ 60,677	$ 54,885
Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	60,720	55,005
Gross Unrealized Gains	17	13
Gross Unrealized Losses	(60)	(133)
Market Value	$ 60,677	$ 54,885

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- Definition

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

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