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Fair Value Measurements (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
7.75% Senior Notes due 2019    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying Amount $ 475,000us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= bas_SevenPointSeventyFivePercentageSeniorNotesDueTwoThousandNineteenMember		 $ 475,000us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= bas_SevenPointSeventyFivePercentageSeniorNotesDueTwoThousandNineteenMember
Fair Value 369,906us-gaap_NotesPayableFairValueDisclosure
/ us-gaap_DebtInstrumentAxis
= bas_SevenPointSeventyFivePercentageSeniorNotesDueTwoThousandNineteenMember		 372,875us-gaap_NotesPayableFairValueDisclosure
/ us-gaap_DebtInstrumentAxis
= bas_SevenPointSeventyFivePercentageSeniorNotesDueTwoThousandNineteenMember
7.75% Senior Notes due 2022    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying Amount 300,000us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= bas_SevenPointSeventyFivePercentageSeniorNotesDueTwentyTwentyTwoMember		 300,000us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= bas_SevenPointSeventyFivePercentageSeniorNotesDueTwentyTwentyTwoMember
Fair Value $ 230,622us-gaap_NotesPayableFairValueDisclosure
/ us-gaap_DebtInstrumentAxis
= bas_SevenPointSeventyFivePercentageSeniorNotesDueTwentyTwentyTwoMember		 $ 225,000us-gaap_NotesPayableFairValueDisclosure
/ us-gaap_DebtInstrumentAxis
= bas_SevenPointSeventyFivePercentageSeniorNotesDueTwentyTwentyTwoMember