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COMMITMENTS AND CONTINGENCIES (Details 2) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
COMMITMENTS AND CONTINGENCIES.
Rental expense under operating leases with initial terms exceeding one year	$ 448,000	$ 242,000	$ 1,253,000	$ 725,000
Unused letters of credit, total	$ 233,000		$ 233,000

X

- Definition

Rental expense for the reporting period incurred under operating leases with initial terms exceeding one year.

+ References

No definition available.

+ Details

Name:	dwsn_OperatingLeaseRentalExpenseInitialTermExceedingOneYear
Namespace Prefix:	dwsn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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