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Derivative and Hedging Activities - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) Instruments
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Ineffectiveness recognized for fair value hedge |  | $ 100,000
Scenario, Forecast [Member] | Interest Expense [Member] | Designated as Hedging Instrument [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Reclassification from accumulated other comprehensive income to interest expense | $ 200,000 |
Interest Rate Swap [Member] | Cash Flow Hedging [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional amount of derivative instruments |  | $ 100,000,000
Derivatives, number of instruments held | Instruments |  | 2
Notional amount amortized |  | $ 95,300,000
Notional amount maturity date |  | May 31, 2022

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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 The number of derivative instruments of a particular group held by the entity. + References Reference 1: 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 Reference 2: 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 + Details
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