Debt - Additional Information (Detail)	9 Months Ended
Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Debt, gross	$ 707,600,000
Leverage ratio covenant period	12 months
Repayments of principal in next twelve months	$ 88,300,000
Line of Credit \| Term Loans Due 2023
Debt Instrument [Line Items]
Debt, gross	200,000,000
Optional line of credit limit increase	300,000,000
Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	900,000,000
Debt, gross	0	$ 36,100,000
Available capacity	900,000,000
Line of Credit \| Revolving Credit Facility \| Maximum
Debt Instrument [Line Items]
Debt covenant, unrestricted cash	$ 250,000,000
Debt agreement financial covenant, leverage ratio	3.75
EBITDA ratio for debt	3.00
Line of Credit \| Revolving Credit Facility \| Minimum
Debt Instrument [Line Items]
Debt covenant, unrestricted cash	$ 5,000,000
Debt agreement financial covenant, leverage ratio	1.00
EBITDA ratio for debt	1.00
Commercial Paper
Debt Instrument [Line Items]
Commercial paper	$ 0	$ 0
Other Credit Facilities
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	21,400,000
Borrowings outstanding	$ 0

Debt Instrument, Covenant, Unrestricted Cash

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- Definition

Debt Instrument, EBITDA Ratio Covenant

+ References

No definition available.

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- Definition

Debt Instrument, Leverage Ratio Covenant

+ References

No definition available.

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- Definition

Debt Instrument, Leverage Ratio Covenant Period

+ References

No definition available.

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- Definition

Line of Credit Facility, Accordion Feature, Increase Limit

+ References

No definition available.

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- Definition

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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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
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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.

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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

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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.

+ References

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

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- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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