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Subsequent Events - Additional Information (Detail)
9 Months Ended
May 09, 2018
USD ($)
shares
May 03, 2018
USD ($)
Sep. 30, 2018
USD ($)
Subsequent Event [Line Items]      
Number of companies separated 2    
Common stock issued (in shares) | shares 77,339,828    
Conversion ratio 0.5    
Principal amount of debt issued $ 715,000,000    
Business separation payment 700,000,000 $ 700,000,000  
Proceeds from long-term debt, net of discounts     $ 713,963,000
Registration right agreement term, point before annual interest rate increase   1 year  
Term Loan Facility      
Subsequent Event [Line Items]      
Principal amount of debt issued $ 415,000,000    
Debt instrument, term 7 years    
Line of Credit      
Subsequent Event [Line Items]      
Debt instrument, term 5 years    
6.375% Senior Notes Due May 2026 | Senior Notes      
Subsequent Event [Line Items]      
Principal amount of debt issued   $ 300,000,000  
Debt interest rate   6.375%  
Proceeds from long-term debt, net of discounts   $ 293,800,000  
6.375% Senior Notes Due May 2026 | 6.375% Senior Notes Due May 2026      
Subsequent Event [Line Items]      
Debt interest rate   6.375%  
Proceeds from long-term debt, net of discounts   $ 293,800,000