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Assets and Liabilities Carried at Fair Value Measured on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Other assets
    
Assets:    
Available-for-sale securities $ 267 $ 265
Other Current Assets
    
Assets:    
Derivative financial instruments 194 118
Fair Value Measurements, Level 1 | Other assets
    
Assets:    
Available-for-sale securities 267 265
Fair Value Measurements, Level 2 | Other Current Assets
    
Assets:    
Derivative financial instruments $ 194 $ 118