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SHORT-TERM INVESTMENTS (Details) (USD $)	3 Months Ended
	Mar. 31, 2015 item	Dec. 31, 2014 item
SHORT-TERM INVESTMENTS
Maturity Period of certificates of deposit, minimum	3 months	3 months
Maturity Period of certificates of deposit, maximum	1 year	1 year
Number of certificates of deposit limited to banking institution	1dwsn_NumberOfCertificateOfDepositPerBankingInstitution	1dwsn_NumberOfCertificateOfDepositPerBankingInstitution
Investments exceeding FDIC limit	$ 0dwsn_InvestmentInCertificateOfDepositExceededUnderFederalDepositInsuranceCorporationLimit	$ 0dwsn_InvestmentInCertificateOfDepositExceededUnderFederalDepositInsuranceCorporationLimit

X

- Definition

The latest maturity date when short-term debt instruments are reported on the Schedule of Investments.

+ References

No definition available.

+ Details

Name:	dwsn_CertificatesOfDepositMaturityPeriodMaximum
Namespace Prefix:	dwsn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The earliest maturity date when short-term debt instruments are reported on the Schedule of Investments.

+ References

No definition available.

+ Details

Name:	dwsn_CertificatesOfDepositMaturityPeriodMinimum
Namespace Prefix:	dwsn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of certificate of deposit investments in financial institutions as of the balance sheet date that is in excess of the Federal Deposit Insurance Corporation insurance limit.

+ References

No definition available.

+ Details

Name:	dwsn_InvestmentInCertificateOfDepositExceededUnderFederalDepositInsuranceCorporationLimit
Namespace Prefix:	dwsn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The maximum number of certificate of deposit investments allowed at each banking institution, as dictated by company policy.

+ References

No definition available.

+ Details

Name:	dwsn_NumberOfCertificateOfDepositPerBankingInstitution
Namespace Prefix:	dwsn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	invest_InvestmentsScheduleAbstract
Namespace Prefix:	invest_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration