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Other Financial Statement Information - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Inventory Disclosure [Abstract]          
Cost of inventories for certain materials using LIFO method $ 25,900,000   $ 25,900,000   $ 30,200,000
(Benefit) charge to earnings from LIFO inventory changes $ 200,000 $ 200,000 $ 200,000 $ 2,000