Accrued Expenses (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule Of Accrued Expenses [Abstract]
Compensation related	$ 41,620us-gaap_AccruedSalariesCurrent	$ 34,384us-gaap_AccruedSalariesCurrent
Workers' compensation self-insured risk reserve	9,115	7,006
Health self-insured risk reserve	4,756bas_HealthSelfInsuredRiskReserve	4,461bas_HealthSelfInsuredRiskReserve
Accrual for receipts	416bas_AuthorityForExpenditureAccrual	80bas_AuthorityForExpenditureAccrual
Ad valorem taxes	7,160bas_AdValoremTaxes	2,307bas_AdValoremTaxes
Sales tax	3,123us-gaap_SalesAndExciseTaxPayableCurrent	2,526us-gaap_SalesAndExciseTaxPayableCurrent
Insurance obligations	2,898	3,510
Professional fee accrual	1,221us-gaap_AccruedProfessionalFeesCurrent	1,369us-gaap_AccruedProfessionalFeesCurrent
Fuel accrual	1,371bas_FuelAccrual	2,017bas_FuelAccrual
Accrued interest	19,130us-gaap_InterestPayableCurrent	19,398us-gaap_InterestPayableCurrent
Accrued Expenses	$ 90,810us-gaap_AccruedLiabilitiesCurrent	$ 77,058us-gaap_AccruedLiabilitiesCurrent

Ad valorem taxes

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- Definition

Authority for expenditure accrual

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- Definition

Fuel accrual

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- Definition

Health Self-Insured Risk Reserve

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- Definition

Workers' Compensation Self-Insured Risk Reserve

+ References

No definition available.

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- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable to insurance entities to mitigate potential loss from various risks or to satisfy a promise to provide certain coverage's to employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.15(5))

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 15

-Subparagraph a

-Article 7

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-Name Regulation S-X (SX)

-Number 210

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-Publisher FASB

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-Topic 944

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-Subparagraph (SX 210.9-03.15(5))

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- Definition

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for professional fees, such as for legal and accounting services received. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Current Liabilities

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-Topic 210

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-Section 45

-Paragraph 6

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Carrying value as of the balance sheet date of the obligations incurred through that date and payable for employees' services provided. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Glossary Current Liabilities

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Carrying value as of the balance sheet date of liabilities incurred through that date and payable for statutory sales and use taxes, including value added tax. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19

-Subparagraph a

-Article 5

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-Publisher FASB

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-Glossary Current Liabilities

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