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Short-Term and Long-Term Investments - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Unrealized Losses On Short Term And Long Term Investments [Line Items]
Fair value of Failed Auction Securities	$ 5,688,000	$ 5,651,000
Minimum period for which failed auction securities been in unrealized loss position	12 months
Gross Unrealized Losses	1,136,000	1,175,000
Aggregate credit loss	395,000	395,000	316,000	317,000
Failed Auction Securities [Member]
Unrealized Losses On Short Term And Long Term Investments [Line Items]
Fair value of Failed Auction Securities	4,864,000	4,825,000
Period for which failed auction securities been in unrealized loss position	Exceeds 12 months
Increase in fair value	39,000
Gross Unrealized Losses	1,136,000	1,175,000
Aggregate credit loss	395,000
Aggregate temporary impairment loss	$ 741,000

X

- 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

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

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-Section 50

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-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563



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-Name Accounting Standards Codification

-Topic 320

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-Section 45

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-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562

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- Definition

The cumulative amount of credit losses recognized in earnings related to debt securities held for which a portion of an other than temporary impairment (OTTI) was recognized in other comprehensive income (a component of shareholders' equity).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27340-111563

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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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Increase in fair value of available for sale securities.

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Period for which failed auction securities been in an unrealized loss position.

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