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