v2.4.1.9

Investments (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Certificates of deposit and money market funds due within one year | $ 335,975dva_CertificatesOfDepositMoneyMarketFundsAndUnitedStatesGovernmentSecurities | $ 5,601dva_CertificatesOfDepositMoneyMarketFundsAndUnitedStatesGovernmentSecurities
Investments in mutual funds and common stock | 28,123dva_MutualFundInvestmentsAtFairValue | 19,421dva_MutualFundInvestmentsAtFairValue
Total investment | 364,098us-gaap_MarketableSecurities | 25,022us-gaap_MarketableSecurities
Short-term investments | 337,399us-gaap_MarketableSecuritiesCurrent | 6,801us-gaap_MarketableSecuritiesCurrent
Long-term investments | 26,699us-gaap_MarketableSecuritiesNoncurrent | 18,221us-gaap_MarketableSecuritiesNoncurrent
Held to maturity |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Certificates of deposit and money market funds due within one year | 335,975dva_CertificatesOfDepositMoneyMarketFundsAndUnitedStatesGovernmentSecurities / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_HeldtomaturitySecuritiesMember | 5,601dva_CertificatesOfDepositMoneyMarketFundsAndUnitedStatesGovernmentSecurities / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_HeldtomaturitySecuritiesMember
Total investment | 335,975us-gaap_MarketableSecurities / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_HeldtomaturitySecuritiesMember | 5,601us-gaap_MarketableSecurities / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_HeldtomaturitySecuritiesMember
Short-term investments | 335,975us-gaap_MarketableSecuritiesCurrent / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_HeldtomaturitySecuritiesMember | 5,601us-gaap_MarketableSecuritiesCurrent / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_HeldtomaturitySecuritiesMember
Available for sale |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Investments in mutual funds and common stock | 28,123dva_MutualFundInvestmentsAtFairValue / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember | 19,421dva_MutualFundInvestmentsAtFairValue / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember
Total investment | 28,123us-gaap_MarketableSecurities / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember | 19,421us-gaap_MarketableSecurities / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember
Short-term investments | 1,424us-gaap_MarketableSecuritiesCurrent / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember | 1,200us-gaap_MarketableSecuritiesCurrent / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember
Long-term investments | $ 26,699us-gaap_MarketableSecuritiesNoncurrent / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember | $ 18,221us-gaap_MarketableSecuritiesNoncurrent / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember

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- Definition Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount of investments in debt and equity securities, including, but not limited to, held-to-maturity, trading and available-for-sale expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 2 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 + Details
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- Definition Total debt and equity financial instruments including: (1) securities held-to-maturity and (2) securities available-for-sale that will be held for the long-term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 + Details
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