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Related Party Transactions Addtional Information (Detail) - USD ($)		3 Months Ended	9 Months Ended	12 Months Ended
	Apr. 14, 2015	Dec. 31, 2015	Jun. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013	May. 21, 2015	Mar. 18, 2014	Dec. 13, 2013	Sep. 30, 2012
Related Party Transaction [Line Items]
Expenses related to Services Agreement				$ 3,300,000	$ 5,700,000
Common stock repurchased				(22,200,000)	$ (65,600,000)	$ (12,300,000)
Common stock, shares, issued					201,383,800					202,295,600.00
Accrued investment income				192,000,000	$ 184,900,000
Long-term debt				6,408,400,000	5,194,500,000
HCP Special Situations Fund [Member]
Related Party Transaction [Line Items]
Stock Repurchased and Retired During Period, Shares						1,700,000
Fortress Investment Group [Member]
Related Party Transaction [Line Items]
Accrued investment income				1,600,000	1,900,000
Related Party Transaction, Due from (to) Related Party, Noncurrent				182,600,000	196,800,000
Leucadia [Member] | Maximum
Related Party Transaction [Line Items]
Percentage Of Beneficial Ownership			27.50%
Jefferies [Member]
Related Party Transaction [Line Items]
Expense Related to Distribution or Servicing and Underwriting Fees			$ 12.9
FGL
Related Party Transaction [Line Items]
Sale of Stock, Price Per Share									$ 17.00
Shares Offered To Public In Initial Offering									9,800,000
Shares Offered To Underwriters In Initial Offering									1,500,000
HGI
Related Party Transaction [Line Items]
Common stock repurchased				(22,100,000)	(65,600,000)	$ (12,300,000)
Long-term debt				1,736,400,000	$ 1,325,000,000
Leucadia [Member] | Maximum
Related Party Transaction [Line Items]
Limitation of Sale to Third Partyholders of Common Stock, Percent					4.90%
Preferred Stock [Member] | HCP Stockholders [Member]
Related Party Transaction [Line Items]
Stock Issued During Period, Shares, Acquisitions			23,000,000
Share Price								$ 11.00
Stock Issued During Period, Value, Acquisitions			$ 253,000,000
Fixed Maturities Securities | Fortress Investment Group [Member]
Related Party Transaction [Line Items]
Net Investment Income				8,100,000	$ 1,600,000
Available-for-sale Securities, Noncurrent				181,000,000	194,900,000
Fixed Maturities Securities | Leucadia [Member]
Related Party Transaction [Line Items]
Net Investment Income				0	1,100,000
Fixed Maturities Securities | Jefferies [Member]
Related Party Transaction [Line Items]
Net Investment Income				0	$ 1,200,000
Severance Cost, one time payments [Member]
Related Party Transaction [Line Items]
Severance Costs				0
Severance Cost, Accrued Bonus [Member]
Related Party Transaction [Line Items]
Severance Costs				0
Severance Cost, Future Bonus [Member]
Related Party Transaction [Line Items]
Severance Costs				0
Bridge Loan [Member] | Jefferies [Member]
Related Party Transaction [Line Items]
Long-term debt							$ 1,500.0
Five Point Seven Five Percentage Senior Notes [Member] | Jefferies [Member]
Related Party Transaction [Line Items]
Payments for Commissions				2,600,000
Seven Point Seven Five Percent Senior Unsecured Notes [Member] | Jefferies [Member]
Related Party Transaction [Line Items]
Payments for Commissions	$ 300,000
7.875% Senior Secured Notes, due July 15, 2019 | Jefferies [Member]
Related Party Transaction [Line Items]
Payments for Commissions	$ 400,000			300,000
Public offering of common stock [Member] | Jefferies [Member]
Related Party Transaction [Line Items]
Payments for Commissions				1,500,000
AAG Acquisition [Member] | Jefferies [Member]
Related Party Transaction [Line Items]
Payments for Commissions				0
Real Estate Investments [Member] | Jefferies [Member]
Related Party Transaction [Line Items]
Asset Management Fees				$ 400,000
Subsequent Event [Member] | Jefferies [Member]
Related Party Transaction [Line Items]
Sale of Stock, Consideration Received on Transaction		$ 0
Subsequent Event [Member] | HC2 Holdings Inc. [Member] | Jefferies [Member]
Related Party Transaction [Line Items]
Sale of Stock, Number of Shares Issued in Transaction		1,200,000
Sale of Stock, Consideration Received on Transaction		$ 35,100,000
Proceeds from sale of equity securities, price per share		$ 7.50
Subsequent Event [Member] | HC2 Holdings Inc. [Member] | Harbinger Capital Partners [Member]
Related Party Transaction [Line Items]
Sale of Stock, Number of Shares Issued in Transaction		500,000
Proceeds from sale of equity securities, price per share		$ 7.50

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