Debt Facilities - Optional Redemption Schedule (Detail) - Senior Notes	12 Months Ended
	Dec. 31, 2019
Debt instrument redemption period prior to January 1, 2018
Debt Instrument, Redemption [Line Items]
Redemption price, percentage	100.00%
Redemption, period	90 days
Debt instrument redemption period prior to January 1, 2018 | Redemption by Company of up to 35% of Aggregate Principal
Debt Instrument, Redemption [Line Items]
Percentage of aggregate principal amount for redemption	35.00%
Senior notes indenture outstanding	65.00%
First Scheduled Redemption Price
Debt Instrument, Redemption [Line Items]
Redemption, period	12 months
First Scheduled Redemption Price | Minimum
Debt Instrument, Redemption [Line Items]
Redemption, period	12 months
First Scheduled Redemption Price | Maximum
Debt Instrument, Redemption [Line Items]
Redemption, period	18 months
5.000% Infomart Senior Notes
Debt Instrument, Redemption [Line Items]
Interest rate (percent)	5.00%
5.375% Senior Notes due 2022
Debt Instrument, Redemption [Line Items]
Interest rate (percent)	5.375%
5.375% Senior Notes due 2022 | Early Equity Redemption Price
Debt Instrument, Redemption [Line Items]
Redemption price, percentage	105.375%
5.375% Senior Notes due 2022 | First Scheduled Redemption Price
Debt Instrument, Redemption [Line Items]
Redemption price, percentage	104.031%
5.375% Senior Notes due 2022 | Second Year Redemption Price
Debt Instrument, Redemption [Line Items]
Redemption price, percentage	102.688%
5.375% Senior Notes due 2022 | Third Year Redemption Price
Debt Instrument, Redemption [Line Items]
Redemption price, percentage	101.344%
5.375% Senior Notes due 2022 | Fourth Year (if scheduled) Redemption Price
Debt Instrument, Redemption [Line Items]
Redemption price, percentage	100.00%
2.875% Euro Senior Notes due 2024
Debt Instrument, Redemption [Line Items]
Interest rate (percent)	2.875%
2.875% Euro Senior Notes due 2024 | Early Equity Redemption Price
Debt Instrument, Redemption [Line Items]
Redemption price, percentage	102.875%
2.875% Euro Senior Notes due 2024 | First Scheduled Redemption Price
Debt Instrument, Redemption [Line Items]
Redemption price, percentage	101.438%
2.875% Euro Senior Notes due 2024 | Second Year Redemption Price
Debt Instrument, Redemption [Line Items]
Redemption price, percentage	100.719%
2.875% Euro Senior Notes due 2024 | Third Year Redemption Price
Debt Instrument, Redemption [Line Items]
Redemption price, percentage	100.00%
2.875% Euro Senior Notes due 2025
Debt Instrument, Redemption [Line Items]
Interest rate (percent)	2.875%
2.875% Euro Senior Notes due 2025 | Early Equity Redemption Price
Debt Instrument, Redemption [Line Items]
Redemption price, percentage	102.875%
2.875% Euro Senior Notes due 2025 | First Scheduled Redemption Price
Debt Instrument, Redemption [Line Items]
Redemption price, percentage	101.438%
2.875% Euro Senior Notes due 2025 | Second Year Redemption Price
Debt Instrument, Redemption [Line Items]
Redemption price, percentage	100.719%
2.875% Euro Senior Notes due 2025 | Third Year Redemption Price
Debt Instrument, Redemption [Line Items]
Redemption price, percentage	100.00%
5.875% Senior Notes due 2026
Debt Instrument, Redemption [Line Items]
Interest rate (percent)	5.875%
5.875% Senior Notes due 2026 | Early Equity Redemption Price
Debt Instrument, Redemption [Line Items]
Redemption price, percentage	105.875%
5.875% Senior Notes due 2026 | First Scheduled Redemption Price
Debt Instrument, Redemption [Line Items]
Redemption price, percentage	102.938%
5.875% Senior Notes due 2026 | Second Year Redemption Price
Debt Instrument, Redemption [Line Items]
Redemption price, percentage	101.958%
5.875% Senior Notes due 2026 | Third Year Redemption Price
Debt Instrument, Redemption [Line Items]
Redemption price, percentage	100.979%
5.875% Senior Notes due 2026 | Fourth Year (if scheduled) Redemption Price
Debt Instrument, Redemption [Line Items]
Redemption price, percentage	100.00%
2.875% Euro Senior Notes due 2026
Debt Instrument, Redemption [Line Items]
Interest rate (percent)	2.875%
2.875% Euro Senior Notes due 2026 | Early Equity Redemption Price
Debt Instrument, Redemption [Line Items]
Redemption price, percentage	102.875%
2.875% Euro Senior Notes due 2026 | First Scheduled Redemption Price
Debt Instrument, Redemption [Line Items]
Redemption price, percentage	101.438%
2.875% Euro Senior Notes due 2026 | Second Year Redemption Price
Debt Instrument, Redemption [Line Items]
Redemption price, percentage	100.719%
2.875% Euro Senior Notes due 2026 | Third Year Redemption Price
Debt Instrument, Redemption [Line Items]
Redemption price, percentage	100.00%
5.375% Senior Notes due 2027
Debt Instrument, Redemption [Line Items]
Interest rate (percent)	5.375%
5.375% Senior Notes due 2027 | Early Equity Redemption Price
Debt Instrument, Redemption [Line Items]
Redemption price, percentage	105.375%
5.375% Senior Notes due 2027 | First Scheduled Redemption Price
Debt Instrument, Redemption [Line Items]
Redemption price, percentage	102.688%
5.375% Senior Notes due 2027 | Second Year Redemption Price
Debt Instrument, Redemption [Line Items]
Redemption price, percentage	101.792%
5.375% Senior Notes due 2027 | Third Year Redemption Price
Debt Instrument, Redemption [Line Items]
Redemption price, percentage	100.896%
5.375% Senior Notes due 2027 | Fourth Year (if scheduled) Redemption Price
Debt Instrument, Redemption [Line Items]
Redemption price, percentage	100.00%