Quarterly report pursuant to Section 13 or 15(d)

Debt Obligations - Senior Secured Credit Facility (Detail)

v3.10.0.1
Debt Obligations - Senior Secured Credit Facility (Detail) - Senior Secured Credit Facility - USD ($)
Oct. 10, 2018
Dec. 18, 2015
Line of Credit Facility [Line Items]    
Borrowing capacity   $ 1,810,000,000
Option to increase revolving commitments under the credit agreement   400,000,000.0
Subsequent Event    
Line of Credit Facility [Line Items]    
Borrowing capacity $ 2,590,000,000  
Revolving Credit Facility | Subsequent Event    
Line of Credit Facility [Line Items]    
Borrowing capacity 1,990,000,000  
Increase in maximum borrowing capacity 175,000,000.0  
Term Loan | Subsequent Event    
Line of Credit Facility [Line Items]    
Borrowing capacity 600,000,000.0  
Revolving Loans and Letters of Credit in Alternative Currencies    
Line of Credit Facility [Line Items]    
Borrowing capacity   600,000,000.0
U.S. Dollar | Swing Lines Loan    
Line of Credit Facility [Line Items]    
Borrowing capacity   100,000,000.0
Canadian Dollars | Swing Lines Loan    
Line of Credit Facility [Line Items]    
Borrowing capacity   50,000,000.0
Australian Dollars | Swing Lines Loan    
Line of Credit Facility [Line Items]    
Borrowing capacity   $ 30,000,000.0
Australian Dollars | Swing Lines Loan | Subsequent Event    
Line of Credit Facility [Line Items]    
Borrowing capacity $ 50,000,000.0