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Summary of Significant Accounting Policies (Narrative) (Details) (USD $)
 0 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended
Oct. 16, 2012
Dec. 31, 2014
segment
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Feb. 15, 2011
Oct. 15, 2012
Summary Of Significant Accounting Policies [Line Items]                
Deferred debt costs, net of accumulated amortization   $ 25,700,000us-gaap_DeferredFinanceCostsGross $ 25,700,000us-gaap_DeferredFinanceCostsGross $ 23,200,000us-gaap_DeferredFinanceCostsGross   $ 23,200,000us-gaap_DeferredFinanceCostsGross    
Accumulated amortization of deferred debt costs   10,400,000us-gaap_AccumulatedAmortizationDeferredFinanceCosts 10,400,000us-gaap_AccumulatedAmortizationDeferredFinanceCosts 7,200,000us-gaap_AccumulatedAmortizationDeferredFinanceCosts   7,200,000us-gaap_AccumulatedAmortizationDeferredFinanceCosts    
Amortization of deferred financing costs     3,176,000us-gaap_AmortizationOfFinancingCosts 3,102,000us-gaap_AmortizationOfFinancingCosts 2,831,000us-gaap_AmortizationOfFinancingCosts      
Repayment of senior debt 223,300,000us-gaap_EarlyRepaymentOfSeniorDebt              
Reporting units   3us-gaap_NumberOfReportableSegments            
Impairment loss     34,700,000us-gaap_AssetImpairmentCharges          
Trade names value   1,900,000us-gaap_IndefiniteLivedTradeNames 1,900,000us-gaap_IndefiniteLivedTradeNames 1,900,000us-gaap_IndefiniteLivedTradeNames   1,900,000us-gaap_IndefiniteLivedTradeNames    
Amortization expense of intangible assets     8,600,000us-gaap_AmortizationOfIntangibleAssets 8,400,000us-gaap_AmortizationOfIntangibleAssets 6,900,000us-gaap_AmortizationOfIntangibleAssets      
Future amortization expense for year 2015   8,700,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths 8,700,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths          
Future amortization expense for year 2016   8,200,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo 8,200,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo          
Future amortization expense for year 2017   7,600,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree 7,600,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree          
Future amortization expense for year 2018   6,200,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour 6,200,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour          
Future amortization expense for year 2019   6,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive 6,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive          
Customer Relationships                
Summary Of Significant Accounting Policies [Line Items]                
Amortization period of intangible assets, in years     15 years          
Noncompete Agreements                
Summary Of Significant Accounting Policies [Line Items]                
Amortization period of intangible assets, in years     5 years          
Rig Engineering Plans                
Summary Of Significant Accounting Policies [Line Items]                
Amortization period of intangible assets, in years     15 years          
Well service units and equipment | Minimum                
Summary Of Significant Accounting Policies [Line Items]                
Estimated useful lives     3 years          
Well service units and equipment | Maximum                
Summary Of Significant Accounting Policies [Line Items]                
Estimated useful lives     15 years          
7.125% Senior Notes                
Summary Of Significant Accounting Policies [Line Items]                
Write-off of debt costs           1,800,000us-gaap_WriteOffOfDeferredDebtIssuanceCost
/ us-gaap_DebtInstrumentAxis
= bas_SevenPointOneTwentyFivePercentageSeniorNotesDueTwoThousandSixteenMember		    
7.75% Senior Notes due 2019                
Summary Of Significant Accounting Policies [Line Items]                
Interest rate   7.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= bas_SevenPointSeventyFivePercentageSeniorNotesDueTwoThousandNineteenMember		 7.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= bas_SevenPointSeventyFivePercentageSeniorNotesDueTwoThousandNineteenMember		       7.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= bas_SevenPointSeventyFivePercentageSeniorNotesDueTwoThousandNineteenMember		  
7.75% Senior Notes due 2022                
Summary Of Significant Accounting Policies [Line Items]                
Interest rate   7.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= bas_SevenPointSeventyFivePercentageSeniorNotesDueTwentyTwentyTwoMember		 7.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= bas_SevenPointSeventyFivePercentageSeniorNotesDueTwentyTwentyTwoMember		          
Deferred debt costs, net of accumulated amortization               $ 7,000,000us-gaap_DeferredFinanceCostsGross
/ us-gaap_DebtInstrumentAxis
= bas_SevenPointSeventyFivePercentageSeniorNotesDueTwentyTwentyTwoMember