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Senior Debt - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Sep. 30, 2021 | Dec. 31, 2019
Line Of Credit Facility [Line Items] |  |  |
Repayment of outstanding debt | $ 2,500 |  |
Credit facility principal payments 2021 | 3,100 |  |
Credit facility principal payments 2022 | 3,700 |  |
Credit facility principal payments 2023 | 4,400 |  |
Credit facility principal payments 2024 | $ 62,800 |  |
Weighted average interest rate on outstanding borrowings | 2.25% |  | 3.80%
Maximum consolidated leverage ratio |  | 3.50% |
Scenario Forecast [Member] |  |  |
Line Of Credit Facility [Line Items] |  |  |
Maximum consolidated leverage ratio |  | 3.25% |
Cross Currency Interest Rate Contract [Member] | Minimum [Member] |  |  |
Line Of Credit Facility [Line Items] |  |  |
Basis spread on variable rate | 1.00% |  |
Cross Currency Interest Rate Contract [Member] | Maximum [Member] |  |  |
Line Of Credit Facility [Line Items] |  |  |
Basis spread on variable rate | 2.00% |  |
Federal Funds Rate [Member] |  |  |
Line Of Credit Facility [Line Items] |  |  |
Basis spread on variable rate | 0.50% |  |
One-Month LIBOR [Member] |  |  |
Line Of Credit Facility [Line Items] |  |  |
Basis spread on variable rate | 1.00% |  |
Base Rate [Member] | Minimum [Member] |  |  |
Line Of Credit Facility [Line Items] |  |  |
Basis spread on variable rate | 1.00% |  |
Base Rate [Member] | Maximum [Member] |  |  |
Line Of Credit Facility [Line Items] |  |  |
Basis spread on variable rate | 2.00% |  |
Credit Agreement [Member] |  |  |
Line Of Credit Facility [Line Items] |  |  |
Unused credit availability under credit facility | $ 60,800 |  | $ 82,300
Revolving Credit Loan [Member] |  |  |
Line Of Credit Facility [Line Items] |  |  |
Repayments on revolving credit lines | 9,200 |  |
Revolving Credit Loan | 27,700 |  | 18,500
Letters of Credit [Member] |  |  |
Line Of Credit Facility [Line Items] |  |  |
Aggregate principal amount outstanding under the credit facilities | 7,600 |  | $ 11,000
Bank Guarantees [Member] |  |  |
Line Of Credit Facility [Line Items] |  |  |
Bank guarantee issuance under bilateral lines and collateral | 50,000 |  |
Revolving Credit Loan | 17,200 |  |
Netherlands Facility [Member] | Euro-Denominated Bank Guarantee [Member] |  |  |
Line Of Credit Facility [Line Items] |  |  |
Revolving Credit Loan | $ 3,400 |  |

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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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