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SUPPLEMENTAL CONSOLIDATED FINANCIAL STATEMENT INFORMATION - Accounts Receivable (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Jan. 01, 2025 | Sep. 30, 2024 | Jan. 01, 2024
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SUPPLEMENTAL CONSOLIDATED FINANCIAL STATEMENT INFORMATION |  |  |  |
Accounts receivable related to contracts with customers | $ 2.1 | $ 9.9 | $ 2.8 | $ 12.5

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- Definition Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, related to contracts with customers, classified as current. + References No definition available. + Details
Name: | dwsn_AccountsReceivableContractWithCustomersAfterAllowanceForCreditLossCurrent
Namespace Prefix: | dwsn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_BalanceSheetRelatedDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration