Derivative Financial Instruments - Additional Information (Detail) € in Millions, £ in Millions, $ in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2020 EUR (€)	Mar. 31, 2020 AUD ($)	Mar. 31, 2020 GBP (£)	Mar. 31, 2020 USD ($)	Mar. 31, 2020 CAD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of collateral posted for the net assets/liability positions							$ 30,800,000
Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivatives recorded gains (losses) during the period				$ (1,200,000)		$ 660,000
Interest Rate Swaps/Derivatives [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Reclassification from accumulated other comprehensive income (loss) as increase to interest income				$ 5,000
Foreign Currency Contracts [Member] | EUR [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Foreign currency derivatives cancelled | €	€ 552.1
Foreign Currency Contracts [Member] | GBP [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Foreign currency derivatives cancelled | £			£ 365.5
Foreign Currency Contracts [Member] | AUD [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Foreign currency derivatives cancelled		$ 134.8
Foreign Currency Contracts [Member] | CAD [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Foreign currency derivatives cancelled					$ 23.7