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Derivatives and Hedging Activity - Summary of Notional and Fair Values of Derivative Instruments (Detail) - USD ($)
Mar. 31, 2017
Dec. 31, 2016
Derivatives, Fair Value [Line Items]    
Notional Amount $ 256,200,000 $ 204,100,000
Derivatives Assets 17,400,000 13,500,000
Derivative Liabilities 12,800,000 17,500,000
Interest Rate Contracts [Member]    
Derivatives, Fair Value [Line Items]    
Notional Amount 250,000,000 200,000,000
Derivatives Assets 12,200,000 11,400,000
Foreign Exchange Contracts [Member]    
Derivatives, Fair Value [Line Items]    
Notional Amount 6,200,000 4,100,000
Derivatives Assets 5,200,000 2,100,000
Derivative Liabilities $ 12,800,000 $ 17,500,000