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Derivatives and Hedging Activity - Summary of Notional and Fair Values of Derivative Instruments (Detail) - USD ($)
Sep. 30, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]    
Notional Amount $ 610,200,000 $ 218,700,000
Derivatives Assets 13,900,000 10,300,000
Derivative Liabilities 9,100,000 2,900,000
Interest Rate Contracts [Member]    
Derivatives, Fair Value [Line Items]    
Notional Amount 550,000,000 200,000,000
Derivatives Assets 12,700,000 2,200,000
Foreign Exchange Contracts [Member]    
Derivatives, Fair Value [Line Items]    
Notional Amount 60,200,000 18,700,000
Derivatives Assets 1,200,000 8,100,000
Derivative Liabilities $ 9,100,000 $ 2,900,000