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Derivatives - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Mar. 31, 2018
Dec. 31, 2017
Derivative [Line Items]            
Commencement date     2018-04      
Expiration date     Mar. 31, 2023      
Interest expenses $ 5,634 $ 1,172 $ 12,413 $ 3,114    
Interest Rate Swap            
Derivative [Line Items]            
Interest expenses 300   300      
Not Designated as Hedging Instrument | Foreign exchange contract            
Derivative [Line Items]            
Notional amount 9,700   9,700     $ 34,900
Designated as Hedging Instrument | Interest Rate Contract | Cash Flow Hedging            
Derivative [Line Items]            
Notional amount $ 125,000   $ 125,000   $ 5,300