Applicable Premium As Percentage Of Principal Amount

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- Definition

Debt Instrument, Basis Spread On Variable Rate, Redemption Price Percentage

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- Definition

Debt Instrument, Face Value, Installment

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- Definition

Debt Instrument, Redemption, Period

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- Definition

Percentage of minimum principal amount of senior notes outstanding after initial redemption of up to 35% of principal.

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Percentage of principal amount of senior notes for redemption at a certain time period.

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- Definition

Face (par) amount of debt instrument at time of issuance.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Amount, after accumulated amortization, of debt premium.

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- Definition

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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Debt Facilities - Senior Notes (Detail)		1 Months Ended	12 Months Ended
Debt Facilities - Senior Notes (Detail)	Apr. 02, 2018 USD ($)	Nov. 30, 2014	Dec. 31, 2018 USD ($)	Mar. 14, 2018 EUR (€)	Mar. 14, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 12, 2017
Debt Instrument [Line Items]
Unamortized premium			$ 1,882,000			$ 2,051,000
Senior Notes
Debt Instrument [Line Items]
Unamortized premium			$ 5,031,000			$ 0
Senior Notes \| 5.000% Infomart Senior Notes
Debt Instrument [Line Items]
Interest rate (percent)	5.00%		5.00%
Aggregate principal debt amount issued	$ 750,000,000.0
Debt principal amount	150,000,000.0
Unamortized premium	$ 8,200,000
Senior Notes \| 5.000% Infomart Senior Notes \| Debt instrument redemption period prior to January 1, 2018
Debt Instrument [Line Items]
Redemption, period	90 days
Senior Notes \| 5.000% Infomart Senior Notes \| First Scheduled Redemption Price
Debt Instrument [Line Items]
Redemption, period	12 months
Senior Notes \| 2.875% Euro Senior Notes due 2024
Debt Instrument [Line Items]
Interest rate (percent)			2.875%	2.875%	2.875%
Aggregate principal debt amount issued				€ 750,000,000.0	$ 929,900,000
Unamortized debt issuance costs					$ 11,600,000
Senior Notes \| 2.875% Euro Senior Notes due 2024 \| First Scheduled Redemption Price
Debt Instrument [Line Items]
Redemption price, percentage			101.438%
Senior Notes \| 2.875% Euro Senior Notes due 2026
Debt Instrument [Line Items]
Interest rate (percent)			2.875%				2.875%
Senior Notes \| 2.875% Euro Senior Notes due 2026 \| First Scheduled Redemption Price
Debt Instrument [Line Items]
Redemption price, percentage			101.438%
Senior Notes \| 5.375% Senior Notes due 2022
Debt Instrument [Line Items]
Interest rate (percent)			5.375%
Senior Notes \| 5.375% Senior Notes due 2022 \| Debt instrument redemption period prior to January 1, 2018
Debt Instrument [Line Items]
Redemption price, percentage		100.00%
Senior Notes \| 5.375% Senior Notes due 2022 \| First Scheduled Redemption Price
Debt Instrument [Line Items]
Redemption price, percentage			104.031%
Senior Notes \| 5.375% Senior Notes due 2022 \| Treasury Rate [Member] \| Debt instrument redemption period prior to January 1, 2018
Debt Instrument [Line Items]
Variable redemption price percentage		50.00%
Senior Notes \| 5.375% Senior Notes due 2022 \| Redemption by Company of up to 35% of Aggregate Principal [Member] \| Debt instrument redemption period prior to January 1, 2018
Debt Instrument [Line Items]
Percentage of aggregate principal amount for redemption		35.00%
Senior notes indenture outstanding (percent)		65.00%
Minimum \| Senior Notes \| 5.000% Infomart Senior Notes \| First Scheduled Redemption Price
Debt Instrument [Line Items]
Redemption, period	12 months
Maximum \| Senior Notes \| 5.000% Infomart Senior Notes \| First Scheduled Redemption Price
Debt Instrument [Line Items]
Redemption, period	18 months
Maximum \| Senior Notes \| 5.375% Senior Notes due 2022 \| Debt instrument redemption period prior to January 1, 2018
Debt Instrument [Line Items]
Applicable premium as a percentage of principal amount		1.00%