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Consolidated Statements of Comprehensive Income (Parentheticals) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Unrеalizеd gain on еffеctivе portion of fuеl hеdgеs, tax | $ 9,892 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax | $ 567 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax | $ 2,100 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax
Rеclassification of fuеl hеdgе gains into statеmеnt of opеrations, tax | $ 1,206 cvti_CashFlowHedgeGainReclassifiedToEarningsTax | $ 247 cvti_CashFlowHedgeGainReclassifiedToEarningsTax | $ 1,932 cvti_CashFlowHedgeGainReclassifiedToEarningsTax

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- Definition Tax effect on amount of gains on a cash flow hedge reclassified in the period to earnings from accumulated other comprehensive income. + References No definition available. + Details
Name: | cvti_CashFlowHedgeGainReclassifiedToEarningsTax
Namespace Prefix: | cvti_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of tax expense (benefit), before reclassification adjustments, related to increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e640-108580 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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