Investments - Additional Information (Detail) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items]
Other-than-temporary impairments before taxes	$ 11,000	$ 10,000	$ 86,000
Sale of auction rate securities, price as percentage of par value	75.00%	81.00%
Auction rate preferred securities, held at par value		1,100,000
Redemptions of auction rate securities		25,000
Auction rate preferred securities, par value	1,100,000	1,100,000
Marketable securities
Schedule of Available-for-sale Securities [Line Items]
Realized gain on sale of marketable securities	3,000.0	52,000.0	1,100,000
Realized loss on sale of marketable securities	$ 60,000	$ 0	$ 51,000

Auction Rate Securities, Held at Par Value

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- Definition

Available for Sale Auction Rate Securities Sale Price Percentage of Par Value

+ References

No definition available.

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- Definition

Redeemed Or Repurchased Of Auction Rate Securities At Par Value

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- Definition

Amount of par or stated value of auction preferred securities.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29

-Article 5

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-Paragraph 4

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- Definition

This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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- Definition

The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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