v2.4.0.6

Basis of Presentation and Significant Accounting Policies (Details 2) | 12 Months Ended
--- | ---
Dec. 31, 2011 Y
Maximum |
Derivative |
Time charter agreement terms | 5
Minimum |
Derivative |
Time charter agreement terms | 2

X
- Definition The range of terms related to time charter agreements. + References No definition available. + Details
Name: | bg_TimeCharterAgreementTerms
Namespace Prefix: | bg_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration