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Marketable Investments - Summary of Company's Marketable Investments (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 55,508	$ 80,988
Gross Unrealized Gains	54	117
Gross Unrealized Losses	(65)	(92)
Total	55,497	81,013
State and Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,980	6,809
Gross Unrealized Gains	2	5
Gross Unrealized Losses
Total	1,982	6,814
Federal Agency and Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	53,528	74,179
Gross Unrealized Gains	52	112
Gross Unrealized Losses	(65)	(92)
Total	$ 53,515	$ 74,199

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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

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