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Derivative and Hedging Activities - Additional Information (Detail) | 6 Months Ended |
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Jun. 30, 2018 USD ($) Instruments | Jan. 01, 2018 USD ($)
Accounting Standards Update 2017-12 [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Adjustment to retained earnings and accumulated other comprehensive income to reclassify cash flow hedge |  | $ 100,000
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 | $ 500,000 |
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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