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Derivatives - Additional Information (Detail) - USD ($)
9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Derivative [Line Items]    
Commencement date 2013-03  
Expiration date Jun. 30, 2018  
Duration of losses in other comprehensive income expected to be reclassified to earnings 12 months  
Cash Flow Hedging | Interest Expense    
Derivative [Line Items]    
Accumulated other comprehensive loss expected to be reclassified to income $ 0  
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Contract    
Derivative [Line Items]    
Notional amount 7,900,000 $ 14,000,000
Not Designated as Hedging Instrument | Foreign exchange contract    
Derivative [Line Items]    
Notional amount $ 40,500,000 $ 38,300,000