General discussion of the entity's interest rate derivative activities.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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-Name Accounting Standards Codification
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Name:	us-gaap_DescriptionOfInterestRateDerivativeActivities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Derivatives - Narrative (Detail) - USD ($)	12 Months Ended
Derivatives - Narrative (Detail) - USD ($)	Dec. 31, 2019	Nov. 20, 2019	Oct. 31, 2019	Dec. 31, 2018
Not Designated as Hedging Instrument \| Foreign Currency Contracts
Derivative [Line Items]
Aggregate notional value	$ 179,900,000			$ 170,800,000
Designated as Hedging Instrument \| Interest Rate Swap
Derivative [Line Items]
Aggregate notional value		$ 200,000,000
Derivative instrument, interest rate description	LIBOR
Derivative instrument, maturity date	Jan. 15, 2024
Designated as Hedging Instrument \| Interest Rate Swap \| Derivatives Designated as Cash Flow Hedges
Derivative [Line Items]
Aggregate notional value			$ 200,000,000