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Debt - Additional Information (Detail)			1 Months Ended	6 Months Ended
	Jun. 11, 2018 USD ($)	May 31, 2018 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2020 USD ($) renewal
Debt Instrument
Number of renewals | renewal				2
Renewal term				1 year
Borrowings outstanding under the Credit Facility				$ 0
Term Loan
Debt Instrument
Extinguishment of debt, amount	$ 525,000,000
Revolving Credit Facility Ending in March 2020 | Revolving Credit Facility
Debt Instrument
Term of loan (years)		5 years
Credit facility maximum borrowing capacity		$ 400,000,000
Credit facility, additional borrowings capacity				200,000,000
Revolving Credit Facility Ending In June 2023 | Revolving Credit Facility
Debt Instrument
Credit facility maximum borrowing capacity			$ 400,000,000	400,000,000
Senior Unsecured term loan Issued June 2018 | Senior Unsecured Term Loan
Debt Instrument
Term of loan (years)			5 years
Debt instrument, face amount	$ 500,000,000
Principal outstanding				$ 469,000,000
Debt Instrument, Redemption, Period One
Debt Instrument
Term loan, payable quarterly installments (percentage)	1.25%
Debt Instrument, Redemption, Period Two
Debt Instrument
Term loan, payable quarterly installments (percentage)	2.50%
Debt Instrument, Redemption, Period Three
Debt Instrument
Term loan, payable quarterly installments (percentage)	5.00%
Interest Rate Swap
Debt Instrument
Fixed rate on term loan (percentage)				2.86%
All-in fixed rate (percentage)				4.36%

X

- Definition

Line Of Credit Facility, Number Of Renewals

+ References

No definition available.

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- Definition

Line Of Credit Facility, Renewal Term

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- Definition

Line of Credit Facility, Additional Borrowings Capacity

+ References

No definition available.

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
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- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
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- 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
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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.

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Fixed interest rate related to the interest rate derivative.

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- Definition

Stated rate on an interest rate forward or futures contract.

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- Definition

Gross amount of debt extinguished.

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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.

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- 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.

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