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Acquisitions - Summarization of Provisional and Final Amounts on Assets Acquired and Liabilities at Fair Value (Parenthetical) (Detail) (FGL [Member], USD $) In Thousands, unless otherwise specified | Sep. 30, 2012
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FGL [Member] |
Business Acquisition [Line Items] |
Cash acquired | $ 1,040,470
Re-characterized as expense | $ 5,000

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- Definition Business acquisition cost of acquired entity re-characterized as an expense. + References No definition available. + Details
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Namespace Prefix: | hrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Definition The amount of cash and cash equivalents acquired in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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