Represents the excess coverage from the insurance policy.

No definition available.

Name:	cvti_InsurancePolicyExcessCoverage
Namespace Prefix:	cvti_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The policy retains the first amount for the primary layer of the auto liability program.

+ References

No definition available.

+ Details

Name:	cvti_InsurancePolicyPrimaryOccurenceLimit
Namespace Prefix:	cvti_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The term of the insurance policy.

+ References

No definition available.

+ Details

Name:	cvti_InsurancePolicyTerm
Namespace Prefix:	cvti_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	cvti_Note10CommitmentsandContingenciesDetailsLineItems
Namespace Prefix:	cvti_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of increase (decrease) in liability to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

+ Details

Name:	us-gaap_IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of judgment or settlement awarded to (against) the entity in respect of litigation.

+ References

No definition available.

+ Details

Name:	us-gaap_LitigationSettlementAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The estimated maximum amount of possible loss from the contingency.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 9

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349

+ Details

Name:	us-gaap_LossContingencyRangeOfPossibleLossMaximum
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_LitigationCaseAxis=cvti_CargoClaimMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Note 10 - Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	0 Months Ended	1 Months Ended
	Apr. 30, 2015	Aug. 26, 2014	Sep. 30, 2014	Mar. 31, 2015	Dec. 31, 2014
Note 10 - Commitments and Contingencies (Details) [Line Items]
Letters of Credit Outstanding, Amount				$ 37.0	$ 34.3
Insurance Policy, Term	3 years
Subsequent Event [Member]
Note 10 - Commitments and Contingencies (Details) [Line Items]
Insurance Policy, Primary Occurence Limit	1.0
Insurance Policy, Excess Coverage	75.0
Loss Contingency, Range of Possible Loss, Maximum	20.0
Cargo Claim [Member]
Note 10 - Commitments and Contingencies (Details) [Line Items]
Litigation Settlement, Amount		5.9
Increase (Decrease) in Liability for Claims and Claims Adjustment Expense Reserve		$ 7.5	$ 8.1