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Summary of Accounting Policies - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Unconsolidated Affiliates [Member]          
Summary Of Accounting Policies [Line Items]          
Investments in unconsolidated affiliates $ 18,400,000   $ 18,400,000   $ 15,200,000
Purchases from unconsolidated affiliates 2,400,000 $ 2,700,000 8,100,000 $ 10,100,000  
Sales to unconsolidated affiliates $ 100,000 $ 0.0 300,000 $ 0.0  
Minimum [Member] | Change in Accounting Method Accounted for as Change in Estimate [Member]          
Summary Of Accounting Policies [Line Items]          
Increase in inventory asset and returns liability     24,000,000    
Increase in inventory obsolescence reserve     $ 2,000,000    
Minimum [Member] | Unconsolidated Affiliates [Member]          
Summary Of Accounting Policies [Line Items]          
Percentage of ownership interest under equity method accounting 20.00%   20.00%    
Maximum [Member] | Change in Accounting Method Accounted for as Change in Estimate [Member]          
Summary Of Accounting Policies [Line Items]          
Increase in inventory asset and returns liability     $ 28,000,000    
Increase in inventory obsolescence reserve     $ 3,000,000    
Maximum [Member] | Unconsolidated Affiliates [Member]          
Summary Of Accounting Policies [Line Items]          
Percentage of ownership interest under equity method accounting 50.00%   50.00%