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Derivative Instruments - Additional Information (Detail) - Other Assets $ in Millions	Sep. 30, 2015 USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Collateral posted for derivatives	$ 4.8
Interest Rate Swap
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Margin calls made in connection with interest rate swaps	$ 18.8

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of right to receive cash collateral under master netting arrangements offset against derivative liabilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 20



-Section 50



-Paragraph 3



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-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 815



-SubTopic 10



-Section 45



-Paragraph 5



-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

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Fair value of securities pledged as collateral against derivative liabilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 20



-Section 55



-Paragraph 12



-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226013-175313

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