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Summary of Gross Realized Gain and Loss from Sale of Available-for-Sale Marketable Securities (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Investments, Debt and Equity Securities [Abstract]
Gross realized gain from sale of available-for-sale marketable securities	$ 99us-gaap_AvailableForSaleSecuritiesGrossRealizedGains	$ 400us-gaap_AvailableForSaleSecuritiesGrossRealizedGains	$ 301us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Gross realized loss from sale of available-for-sale marketable securities	$ (93)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses	$ (21)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses	$ (117)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses

X

- 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

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563

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X

- Definition

This item represents the gross loss 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

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563

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