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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
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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 | $ 99 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains | $ 400 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains | $ 301 us-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

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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 -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- 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 + Details
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