v3.3.0.814
Inventories - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Inventory Disclosure [Abstract]        
Cost of sales LIFO adjustment $ 13.3 $ 0.2 $ 24.1 $ 7.0