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Assets and Liabilities Carried at Fair Value Measured on Recurring Basis (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Other assets    
Assets:    
Available-for-sale securities $ 281 $ 254
Other Current Assets    
Assets:    
Derivative financial instruments 241 1,249
Accrued expenses and other current liabilities    
Liabilities:    
Derivative financial instruments 39 7
Fair Value Measurements, Level 1 | Other assets    
Assets:    
Available-for-sale securities 281 254
Fair Value Measurements, Level 2 | Other Current Assets    
Assets:    
Derivative financial instruments 241 1,249
Fair Value Measurements, Level 2 | Accrued expenses and other current liabilities    
Liabilities:    
Derivative financial instruments $ 39 $ 7