Borrowings - Components of Long-Term Debt (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Oct. 31, 2019	Nov. 20, 2017
Line of Credit Facility [Line Items]
Long-term debt, Gross	$ 1,923,000	$ 2,176,500
Less: Unamortized debt issuance costs	(14,057)	(17,675)
Net carrying amount	1,908,943	2,158,825
Current portion of borrowings	(50,000)	(86,625)
Long-term borrowings	1,858,943	2,072,200
Revolving Credit Facility
Line of Credit Facility [Line Items]
Long-term line of credit	$ 300,000	$ 293,000
Senior credit facility interest rate	3.12%	4.27%
Securitization Program
Line of Credit Facility [Line Items]
Securitization program, at a rate of 2.51% at December 31, 2019 and 3.25% at December 31, 2018	$ 50,000	$ 50,000
Interest rate	2.51%	3.25%
Term loan facility, at a rate of 3.17% at December 31, 2019 and 4.27% at December 31 2018, due 2022 | Term Loan
Line of Credit Facility [Line Items]
Long-term line of credit	$ 673,000	$ 683,500
Senior credit facility interest rate	3.17%	4.27%
5.25% Senior Notes due 2024 | Senior Notes
Line of Credit Facility [Line Items]
Senior notes	$ 0	$ 250,000
Interest rate	5.25%	5.25%	5.25%
4.875% Senior Notes due 2026 | Senior Notes
Line of Credit Facility [Line Items]
Senior notes	$ 400,000	$ 400,000
Interest rate	4.875%	4.875%
4.625% Senior Notes due 2027 | Senior Notes
Line of Credit Facility [Line Items]
Senior notes	$ 500,000	$ 500,000		$ 500,000
Interest rate	4.625%	4.625%		4.625%