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Derivative and Hedging Activities - Additional Information (Detail) | 9 Months Ended
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Sep. 30, 2019 USD ($) Instruments Swap | Sep. 30, 2018 USD ($)
Term Loan [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Number of swaps | Swap | 2 |
Designated as Hedging Instrument [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Cash Flow Hedge Gain (Loss) to be Reclassified | $ 0 | $ 0
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Reclassification from accumulated other comprehensive income to interest expense | 1,500,000 |
Interest Rate Swap [Member] | Cash Flow Hedging [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional amount of derivative instruments | $ 200,000,000.0 |
Notional amount maturity date | May 31, 2022 |
Interest Rate Swap [Member] | Cash Flow Hedging [Member] | Interest Rate Swap Matured on May 31, 2022 [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional amount amortized | $ 95,300,000 |
Notional amount maturity date | May 31, 2022 |
Derivatives, number of instruments amortized | Instruments | 1 |
Interest Rate Swap [Member] | Cash Flow Hedging [Member] | Interest Rate Swap Matured on April 15, 2025 [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional amount amortized | $ 93,300,000 |
Notional amount maturity date | Apr. 15, 2025 |
Derivatives, number of instruments amortized | Instruments | 1 |
Forward Interest Rate Swaps [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional amount of derivative instruments | $ 100,000,000.0 |
Notional amount amortized | $ 97,000,000.0 |
Notional amount maturity date | Apr. 15, 2025 |
Notional amount beginning date | May 31, 2022 |

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