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Subsequent Events - Additional Information (Detail) (USD $)					3 Months Ended			3 Months Ended
	Sep. 30, 2014 7.875% Senior Secured Notes, due July 15, 2019 HGI	Sep. 30, 2013 7.875% Senior Secured Notes, due July 15, 2019 HGI	Jul. 23, 2013 7.875% Senior Secured Notes, due July 15, 2019 HGI	Dec. 31, 2012 7.875% Senior Secured Notes, due July 15, 2019 HGI	Dec. 31, 2014 Tell Manufacturing [Member] Subsequent Event [Member]	Dec. 31, 2014 Compass Production Partners [Member] Subsequent Event [Member]	Oct. 06, 2014 Compass Production Partners [Member] Subsequent Event [Member]	Dec. 31, 2014 Ability Re [Member] Subsequent Event [Member]	Nov. 03, 2014 Ability Re [Member] Subsequent Event [Member]	Sep. 30, 2014 Global Expense Rationalization Initiatives
Subsequent Event [Line Items]
Business Combination, Consideration Transferred					$ 31,800,000	$ 118,800,000		$ 17,900,000
Business Acquisition Percentage Of Equity Interests Acquired							25.00%
Debt Instrument, Face Amount			225,000,000	700,000,000.0
Long-term debt, interest rate	7.90%	0.00%		7.875%
Debt Instrument Issue Price As Percentage Of Principle Amount			101.50%	99.36%
Total Projected Costs										46,500,000
Maximum Amount Of Asset Securing Reinsurance Obligations									$ 350,000,000

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Debt Instrument Issue Price As Percentage Of Principle Amount

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Maximum amount of asset securing reinsurance obligations.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Face (par) amount of debt instrument at time of issuance.

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The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

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