Quarterly report pursuant to Section 13 or 15(d)

Debt Obligations (Credit Facility - Amended and Restated Credit Agreement) - Additional Information (Detail)

v3.7.0.1
Debt Obligations (Credit Facility - Amended and Restated Credit Agreement) - Additional Information (Detail) - Current Credit Agreement [Member]
3 Months Ended
Mar. 31, 2017
USD ($)
Line of Credit Facility [Line Items]  
Senior secured revolving credit facility $ 1,810,000,000
Maturity date of senior secured revolving credit facility Dec. 18, 2020
Option to increase revolving commitments under the credit agreement $ 400,000,000
Revolving Loans and Letter of Credit in Alternative Currencies [Member]  
Line of Credit Facility [Line Items]  
Senior secured revolving credit facility 600,000,000
U S Dollar [Member] | Swing Lines Loan [Member]  
Line of Credit Facility [Line Items]  
Senior secured revolving credit facility 100,000,000
Canadian Dollars [Member] | Swing Lines Loan [Member]  
Line of Credit Facility [Line Items]  
Senior secured revolving credit facility 50,000,000
Australian Dollars [Member] | Swing Lines Loan [Member]  
Line of Credit Facility [Line Items]  
Senior secured revolving credit facility $ 30,000,000