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Derivatives - Additional Information (Detail)
9 Months Ended
Sep. 30, 2015
USD ($)
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]  
Gains (losses) in other comprehensive income expected to be reclassified to earnings $ 0
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Contract  
Derivative [Line Items]  
Notional amount 21,400,000
Not Designated as Hedging Instrument | Foreign exchange contract  
Derivative [Line Items]  
Notional amount $ 12,100,000