Disclosure about revenues from external customers (1) attributed to the entity's country of domicile and (2) attributed to all foreign countries in total from which the entity derives revenues and the long-lived assets (except financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets) that are (1) located in the entity's country of domicile, and (2) located in all foreign countries in which the entity holds assets.

No definition available.

Name:	dwsn_DisclosureOnGeographicAreasDescriptionOfRevenueFromExternalCustomersAndLongLivedAssets
Namespace Prefix:	dwsn_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration