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Subsidiaries and Variable Interest Entities (Parenthetical) (Detail) | 6 Months Ended | 12 Months Ended
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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 + Details
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