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Hedging Derivative Financial Instruments - Maturity Period of Outstanding Interest Rate Futures Contracts (Detail) - Interest rate futures contracts [member] - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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March 2017 [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Contract Amount |  | $ 53.6
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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