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Long-Term Debt and Financing Arrangements - Additional Information (Detail) - USD ($) $ in Millions | Jul. 01, 2017 | Sep. 30, 2021 | Dec. 31, 2020
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Standby Letters of Credit [Member] |  |  |
Line Of Credit Facility [Line Items] |  |  |
Outstanding letters of credit |  | $ 41.3 |
Revolving Credit Facility [Member] | Bank Revolving Line Of Credit [Member] |  |  |
Line Of Credit Facility [Line Items] |  |  |
Unused and available borrowings under bank revolving line of credit and credit agreement |  | $ 308.7 | $ 312.3
Credit Agreement [Member] |  |  |
Line Of Credit Facility [Line Items] |  |  |
Amount of credit agreement | $ 350.0 |  |
Line of Credit Facility, Expiration Date | Jul. 01, 2022 |  |

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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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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- 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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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Balance Type: | credit
Period Type: | instant

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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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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Period Type: | instant

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- Details
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- Details
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- Details
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Balance Type: |
Period Type: |

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- Details
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Balance Type: |
Period Type: |