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Long-Term Debt - Refinancing of Credit Facilities - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Feb. 17, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Line of Credit Facility [Line Items]          
Capitalized debt issuance costs   $ 11,300,000   $ 11,300,000  
Loss on early extinguishment of debt   $ 0 $ 0 $ 20,400,000 $ 0
Revolving Credit Facility          
Line of Credit Facility [Line Items]          
Aggregate principal amount outstanding $ 500,000,000.0        
Maturity Dates Dec. 12, 2019        
Term Loan Facility          
Line of Credit Facility [Line Items]          
Aggregate principal amount outstanding $ 4,900,000,000.0        
Maturity Dates Feb. 17, 2024     Dec. 12, 2021  
Repayment of term loan facility $ 146,100,000        
Interest rate 1.25%        
Margin percentage for fluctuating interest rate 2.25%