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Derivatives - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Mar. 31, 2018
Dec. 31, 2017
Derivative [Line Items]            
Commencement date     2018-04      
Expiration date     Mar. 31, 2023      
Interest expenses $ 4,676 $ 1,001 $ 6,779 $ 1,942    
Interest Rate Swap            
Derivative [Line Items]            
Interest expenses 200   200      
Not Designated as Hedging Instrument | Foreign exchange contract            
Derivative [Line Items]            
Notional amount 21,500   21,500     $ 34,900
Designated as Hedging Instrument | Interest Rate Contract | Cash Flow Hedging            
Derivative [Line Items]            
Notional amount $ 125,000   $ 125,000   $ 5,300