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Fair Value Measurements - Narrative (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Impairment of trademark $ 9,200      
Non-cash asset impairment charge   $ 56,324 $ 0 $ 0
Estimated fair value of long-term debt, including the current portion   3,010,000 2,180,000  
Long-term debt, gross   3,150,000 $ 2,150,000  
Selling, general and administrative expenses        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Non-cash asset impairment charge   21,200    
Cost of sales        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Non-cash asset impairment charge   $ 20,600