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Derivative and Hedging Activities - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) Instruments Swap | Dec. 31, 2017 USD ($) Instruments | Dec. 31, 2016 USD ($) | Jan. 01, 2018 USD ($)
Term Loan [Member] |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Number of swaps | Swap | 3 |  |  |
Designated as Hedging Instrument [Member] |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Cash Flow Hedge Gain (Loss) to be Reclassified | $ 0 | $ 0 | $ 0 |
Designated as Hedging Instrument [Member] | Term Loan [Member] |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Debt instrument, face amount | 200,000,000 |  |  |
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 | (300,000) |  |  |
Interest Rate Swap [Member] | Cash Flow Hedging [Member] |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Notional amount of derivative instruments | $ 200,000,000 | $ 100,000,000 |  |
Derivatives, number of instruments held | Instruments | 2 | 1 |  |
Notional amount amortized |  | $ 95,300,000 |  |
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 |  |  |
Notional amount amortized | $ 97,000,000 |  |  |
Notional amount maturity date | Apr. 15, 2025 |  |  |
Notional amount beginning date | May 31, 2022 |  |  |

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