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Assets and Liabilities Carried at Fair Value Measured on Recurring Basis (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Other current assets    
Assets:    
Derivative financial instruments $ 123 $ 250
Other assets    
Assets:    
Equity securities 372 332
Accrued expenses and other current liabilities    
Liabilities:    
Derivative financial instruments 408 957
Fair Value Measurements, Level 1 | Other assets    
Assets:    
Equity securities 372 332
Fair Value Measurements, Level 2 | Other current assets    
Assets:    
Derivative financial instruments 123 250
Fair Value Measurements, Level 2 | Accrued expenses and other current liabilities    
Liabilities:    
Derivative financial instruments $ 408 $ 957