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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
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-Paragraph 6
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- Definition

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.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 2
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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

Weighted average interest rate of long-term debt outstanding calculated at point in time.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 210
-SubTopic 10
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Name:	srt_RangeAxis=srt_MinimumMember
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Debt - Credit Facility - Additional Information (Detail) € in Millions	Feb. 01, 2017 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Feb. 01, 2017 EUR (€)
Debt Instrument [Line Items]
Aggregate committed amount of credit facility	$ 500,000,000
Minimum [Member]
Debt Instrument [Line Items]
Commitment fee	0.125%
Maximum [Member]
Debt Instrument [Line Items]
Commitment fee	0.30%
Unsecured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Amount of senior unsecured debt	$ 1,300,000,000
Debt instrument, maturity date	Feb. 28, 2021
Aggregate committed amount of credit facility		$ 1,270,000,000
Credit facilities, amount outstanding		$ 28,100,000	$ 840,800,000
Credit facilities, weighted average interest rate		2.70%	2.40%
Term Loans [Member]
Debt Instrument [Line Items]
Amount of senior unsecured debt	$ 200,000,000			€ 200
Debt instrument, maturity date	Feb. 01, 2022
Decrease in unsecured debt from previous facility	$ 50,000,000
Aggregate committed amount of credit facility			$ 1,000,000,000
Interest rate at end of period		3.89%	2.98%
Alternate Base Rate [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Applicable margin	0.00%
Applicable margin for revolving loans	0.00%
Alternate Base Rate [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Applicable margin	0.95%
Applicable margin for revolving loans	0.65%
Eurodollar Loans [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Applicable margin	0.90%
Applicable margin for revolving loans	0.875%
Eurodollar Loans [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Applicable margin	1.95%
Applicable margin for revolving loans	1.65%
Euro [Member] \| Term Loans [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Jan. 31, 2020