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Reinsurance - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 07, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |  |
Fair value of insurance transferred assets net of ceding commission | $ 653,684 | $ 535,826 |
Capital contribution | 250 |  |
Subordinated debt | 95,000 |  |
Statutory reserve | 535,000 |  |
Upfront structuring Fee | 13,750 |  |
Fair value of insurance transferred assets |  | 580,683 |
Pre tax gain on reinsurance transactions deferred |  | 18,029 |
Reinsurance expense |  | 4,004 | 1,809
Upfront structuring Fee | 13,750 |  |
Nomura [Member] |  |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |  |
Upfront structuring Fee |  | 2,800 |
Reserve financing facility |  | 295,000 |
Upfront structuring Fee |  | $ 2,800 |

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- Definition Cash Capital Contribution + References No definition available. + Details
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- Definition Fair value of assets transferred including ceding commission under commitment agreement. + References No definition available. + Details
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- Definition Insurance Transferred Assets At Fair Value Net + References No definition available. + Details
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- Definition Letter Of Credit + References No definition available. + Details
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- Definition Other Reinsurance Related Expense + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Pretax Gain On Reinsurance Transactions Deferred + References No definition available. + Details
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- Definition Statutory Reserve + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Upfront Arrangement Fees Incurred In Connection With Credit Facility + References No definition available. + Details
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Namespace Prefix: | hrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section F Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Article 5 -Subsection 19, 20, 22 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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