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Marketable Investments - Summary of Company's Marketable Investments (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 80,938	$ 80,988
Gross Unrealized Gains	119	117
Gross Unrealized Losses	(33)	(92)
Total	81,024	81,013
State and Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,203	6,809
Gross Unrealized Gains	3	5
Gross Unrealized Losses
Total	4,206	6,814
Federal Agency and Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	76,735	74,179
Gross Unrealized Gains	116	112
Gross Unrealized Losses	(33)	(92)
Total	$ 76,818	$ 74,199

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- Definition

Amount of accumulated pre-tax unrealized gain before deducting pre-tax unrealized losses on investments in available-for-sale securities impacting investments.

+ References

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Amount of accumulated pre-tax unrealized loss before deducting pre-tax unrealized gain on investments in available-for-sale securities impacting investments.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

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-Publisher FASB

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