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Derivatives and Hedging Activity - Summary of Notional and Fair Values of Derivative Instruments (Detail) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
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Derivatives, Fair Value [Line Items] |  |
Notional Amount | $ 218,700,000 | $ 204,100,000
Derivatives Assets | 10,300,000 | 13,500,000
Derivative Liabilities | 2,900,000 | 17,500,000
Interest Rate Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 200,000,000 | 200,000,000
Derivatives Assets | 2,200,000 | 11,400,000
Foreign Exchange Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 18,700,000 | 4,100,000
Derivatives Assets | 8,100,000 | 2,100,000
Derivative Liabilities | $ 2,900,000 | $ 17,500,000

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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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- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959 + Details
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