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COMMITMENTS AND CONTINGENCIES (Details) (Termination of contract, Genco, USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012 item
Termination of contract | Genco
COMMITMENTS AND CONTINGENCIES
Maximum period for making termination payment in lump sum	30 days
Maximum multiplier used to calculate termination payment	5
Maximum prior completed term of management considered for calculation of the termination payment	5 years
Amount that would be owed to Genco if Management Agreement is terminated	$ 22,717

X

- Definition

Represents the maximum multiplier used to calculate termination payment expressed in terms of average annual management fees payable under the management agreement.

+ References

No definition available.

+ Details

Name:	balt_LossContingenciesMaximumMultiplierUsedForCalculatingTerminationPaymentUnderManagementAgreement
Namespace Prefix:	balt_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the maximum period within which the entity must make a payment in lump sum for termination of management agreement.

+ References

No definition available.

+ Details

Name:	balt_LossContingenciesMaximumPeriodForMakingTerminationPaymentInLumpSum
Namespace Prefix:	balt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the maximum prior completed term of the management agreement which is considered for calculation of the termination payment.

+ References

No definition available.

+ Details

Name:	balt_LossContingenciesMaximumPriorCompletedTermOfManagementAgreementConsideredForCalculationOfTerminationPayment
Namespace Prefix:	balt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_LossContingenciesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 9, 10, 11, 12

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14435-108349



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 9

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14557-108349

+ Details

Name:	us-gaap_LossContingencyEstimateOfPossibleLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant