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Hedging Financial Instruments - Maturity Period of Outstanding Interest Rate Futures Contracts (Detail) $ in Millions	Dec. 31, 2017 USD ($)
Interest rate futures contracts [member] | March 2018 [member]
Disclosure of detailed information about financial instruments [line items]
Contract Amount	$ 169.4

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

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- Details

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- Details

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