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Debt Facilities - Summary of Senior Notes (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Apr. 02, 2018	Mar. 14, 2018	Dec. 31, 2017	Dec. 12, 2017
Debt Instrument [Line Items]
Long term debt, gross	$ 1,388,524			$ 1,466,224
Effective interest rate (percent)	7.88%
Add amount representing unamortized debt premium	$ 1,882			2,051
Total long term debt	9,890,531
Senior Notes
Debt Instrument [Line Items]
Long term debt, gross	8,500,125			7,002,000
Less amount representing unamortized debt issuance cost	(75,372)			(78,151)
Add amount representing unamortized debt premium	5,031			0
Total long term debt	8,429,784			6,923,849
Less current portion	(300,999)			0
Long term debt, excluding current maturities	$ 8,128,785			6,923,849
Senior Notes \| 5.000% Infomart Senior Notes
Debt Instrument [Line Items]
Interest rate (percent)	5.00%	5.00%
Long term debt, gross	$ 750,000			$ 0
Effective interest rate (percent)	4.40%			0.00%
Add amount representing unamortized debt premium		$ 8,200
Senior Notes \| 5.375% Senior Notes due 2022
Debt Instrument [Line Items]
Interest rate (percent)	5.375%
Long term debt, gross	$ 750,000			$ 750,000
Effective interest rate (percent)	5.56%			5.56%
Senior Notes \| 5.375% Senior Notes due 2023
Debt Instrument [Line Items]
Interest rate (percent)	5.375%
Long term debt, gross	$ 1,000,000			$ 1,000,000
Effective interest rate (percent)	5.51%			5.51%
Senior Notes \| 2.875% Euro Senior Notes due 2024
Debt Instrument [Line Items]
Interest rate (percent)	2.875%		2.875%
Long term debt, gross	$ 859,125			$ 0
Effective interest rate (percent)	3.08%			0.00%
Senior Notes \| 5.750% Senior Notes due 2025
Debt Instrument [Line Items]
Interest rate (percent)	5.75%
Senior Notes \| 5.750% Senior Notes due 2025
Debt Instrument [Line Items]
Interest rate (percent)	5.75%
Long term debt, gross	$ 500,000			$ 500,000
Effective interest rate (percent)	5.88%			5.88%
Senior Notes \| 2.875% Euro Senior Notes due 2025
Debt Instrument [Line Items]
Interest rate (percent)	2.875%
Long term debt, gross	$ 1,145,500			$ 1,201,000
Effective interest rate (percent)	3.04%			3.04%
Senior Notes \| 5.875% Senior Notes due 2026
Debt Instrument [Line Items]
Interest rate (percent)	5.875%
Long term debt, gross	$ 1,100,000			$ 1,100,000
Effective interest rate (percent)	6.03%			6.03%
Senior Notes \| 2.875% Euro Senior Notes due 2026
Debt Instrument [Line Items]
Interest rate (percent)	2.875%				2.875%
Long term debt, gross	$ 1,145,500			$ 1,201,000
Effective interest rate (percent)	3.04%			3.04%
Senior Notes \| 5.375% Senior Notes due 2027
Debt Instrument [Line Items]
Interest rate (percent)	5.375%
Long term debt, gross	$ 1,250,000			$ 1,250,000
Effective interest rate (percent)	5.51%			5.51%