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Subsidiaries and Variable Interest Entities (Parenthetical) (Detail)	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Variable Interest Entity [Line Items]
Percentage of ownership in HBOP	100.00%	100.00%

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- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 5A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=7880789&loc=SL6759159-111685

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