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v3.20.4

Revolving Line of Credit (Detail) | May 08, 2018 USD ($) | Dec. 31, 2020 USD ($)
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Line of Credit Facility [Line Items] |  |
Unsecured revolving line of credit | $ 400,000,000 |
Revolving credit facility, expiration date | May 08, 2023 |
Line of credit facility-option to increase borrowing capacity | $ 100,000,000 |
Credit facility restrictive covenant, maximum consolidated leverage ratio | 3.25 |
Credit facility restrictive covenant, maximum consolidated leverage ratio step up | 3.75 |
Interest coverage ratio | 3.00 |
Borrowings outstanding |  | $ 131,000,000.0
Interest rate of borrowings outstanding |  | 1.284%
Federal Fund Rate |  |
Line of Credit Facility [Line Items] |  |
Debt instrument basis spread on variable rate | 0.50% |
LIBOR |  |
Line of Credit Facility [Line Items] |  |
Debt instrument basis spread on variable rate | 1.00% |
LIBOR | Minimum |  |
Line of Credit Facility [Line Items] |  |
Debt instrument basis spread on variable rate | 1.00% |
LIBOR | Maximum |  |
Line of Credit Facility [Line Items] |  |
Debt instrument basis spread on variable rate | 1.875% |
Base Rate | Minimum |  |
Line of Credit Facility [Line Items] |  |
Debt instrument basis spread on variable rate | 0.00% |
Base Rate | Maximum |  |
Line of Credit Facility [Line Items] |  |
Debt instrument basis spread on variable rate | 0.875% |

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- Definition Leverage Ratios Maximum + References No definition available. + Details
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- Definition Line of Credit Facility-Option to Increase Borrowing Capacity + References No definition available. + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any 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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