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Financial Instruments - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Derivative [Line Items]          
Net settlement asset $ 1,500,000        
Estimated amount of net foreign currency derivative losses in other comprehensive income reclassified to earnings 200,000 $ 200,000   $ 200,000  
Cash flow hedge [Member]          
Derivative [Line Items]          
Net (losses) gains recognized in OCI   (1,900,000) $ (2,600,000) 2,000,000 $ (2,900,000)
Foreign exchange contracts [Member]          
Derivative [Line Items]          
Notional amount of foreign currency derivative hedges $ 263,900,000 $ 263,900,000   $ 263,900,000