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Merger - Additional Information (Detail) (USD $)	0 Months Ended
	Feb. 11, 2015	Dec. 31, 2014	Sep. 30, 2014
Business Acquisition [Line Items]
Common stock, par value		$ 0.33us-gaap_CommonStockParOrStatedValuePerShare	$ 0.33us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares outstanding		8,077,580us-gaap_CommonStockSharesOutstanding	8,065,233us-gaap_CommonStockSharesOutstanding
Subsequent Event
Business Acquisition [Line Items]
Common stock, par value	$ 0.33us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Reverse stock split	0.3333us-gaap_StockholdersEquityNoteStockSplitConversionRatio1 / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Common stock, shares outstanding	7,333,708us-gaap_CommonStockSharesOutstanding / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Split-effected Common Stock	1.760us-gaap_ConversionOfStockSharesConverted1 / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Subsequent Event | Before Reverse Stock Split
Business Acquisition [Line Items]
Common stock, par value	$ 0.01us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementScenarioAxis = dwsn_BeforeReverseStockSplitMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Common stock, shares outstanding	22,001,125us-gaap_CommonStockSharesOutstanding / us-gaap_StatementScenarioAxis = dwsn_BeforeReverseStockSplitMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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Face amount or stated value per share of common stock.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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