Commitments and Contingencies - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Apr. 06, 2011
Commitment And Contingencies [Line Items]
Reserves for legal, environmental and regulatory matters	21,200,000
Notional amount of unfunded, legally binding lending commitments	217,900,000
Expiration of partial amount of unfunded, legally binding lending commitments	64,800,000
Maximum [Member]
Commitment And Contingencies [Line Items]
Expiry date of partial amount of notional amount	1 year
Expiry date of remainder part of notional amount	5 years
Minimum [Member]
Commitment And Contingencies [Line Items]
Expiry date of remainder part of notional amount	1 year
FGLH [Member]
Commitment And Contingencies [Line Items]
Business Acquisition Fair Value Of Contingent Purchase Price Consideration Reduction			50,000,000
Accrued amount of guaranty fund assessments	3,800,000
Estimated future premium tax deductions	4,000,000
Spectrum Brands [Member]
Commitment And Contingencies [Line Items]
Environmental costs recognized, capitalized	4,600,000
OMGUK CARVM financing fee [Member]
Commitment And Contingencies [Line Items]
Reserves for legal, environmental and regulatory matters	6,100,000
Cressy Plaintiff [Member]
Commitment And Contingencies [Line Items]
Loss Contingency, Receivable	4,400,000
Litigation Settlement, Amount		5,300,000
Loss Contingency Accrual, Provision	9,000,000
Estimated Litigation Liability	3,400,000
Unasserted Claim [Member] | FGLH [Member]
Commitment And Contingencies [Line Items]
Administrative costs and potential liabilities	2,500,000
Loss Contingency Accrual, Payments	1.1