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NET (LOSS) INCOME PER SHARE ATTRIBUTABLE TO COMMON STOCK (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
NET (LOSS) INCOME PER SHARE ATTRIBUTABLE TO COMMON STOCK    
Net (loss) income $ (6,592,000)us-gaap_NetIncomeLoss $ 1,652,000us-gaap_NetIncomeLoss
Income allocable to unvested restricted stock   (21,000)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic
Basic (loss) income attributable to common stock (6,592,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 1,631,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Diluted (loss) income attributable to common stock $ (6,592,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ 1,631,000us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Weighted average common shares outstanding:    
Basic 18,021,366us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 14,009,358us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive common stock options and restricted stock units   66,630us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Diluted 18,021,366us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 14,075,988us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic (loss) income attributable to a share of common stock $ (0.37)us-gaap_EarningsPerShareBasic $ 0.12us-gaap_EarningsPerShareBasic
Diluted (loss) income attributable to a share of common stock $ (0.37)us-gaap_EarningsPerShareDiluted $ 0.12us-gaap_EarningsPerShareDiluted
Number of antidilutive shares   0dwsn_AntiDilutiveSecuritiesEffectOnComputationOfDilutiveEarningsPerShareAmount