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Senior Debt - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Jun. 30, 2024 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2018
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |
Credit facility principal payments 2019 | $ 600,000 | $ 600,000 |  |  |  |  |
Credit facility principal payments 2020 | 2,500,000 | 2,500,000 |  |  |  |  |
Credit facility principal payments 2021 | 3,100,000 | 3,100,000 |  |  |  |  |
Credit facility principal payments 2022 | 3,800,000 | 3,800,000 |  |  |  |  |
Credit facility principal payments 2023 | 4,400,000 | 4,400,000 |  |  |  |  |
Credit facility principal payments 2024 | $ 35,000,000 | $ 35,000,000 |  |  |  |  |
Weighted average stated interest rate on outstanding borrowings | 4.04% | 4.04% |  |  |  |  | 5.27%
Fair value of interest rate swap | $ 0 | $ 0 |  |  |  |  | $ 0
Interest rate swap, fair value, asset | 500,000 | 500,000 |  |  |  |  | 500,000
Debt discount expensed |  | 928,000 | $ 862,000 |  |  |  |
Scenario Forecast [Member] |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum consolidated leverage ratio |  |  |  | 325.00% | 350.00% | 375.00% |
Other Income (Expense), Net [Member] |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |
Change in fair value of interest rate swap recognized as income | 0 | $ 200,000 |  |  |  |  |
Amended and Restated Credit Agreement [Member] |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt instrument extended maturity date |  | Jun. 11, 2024 |  |  |  |  |
Customary closing fees |  | $ 1,100,000 |  |  |  |  |
Debt discount expensed |  | 400,000 |  |  |  |  |
Credit Agreement [Member] |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |
Unused credit availability under credit facility | 108,500,000 | 108,500,000 |  |  |  |  | 50,700,000
Term Loan [Member] | Amended and Restated Credit Agreement [Member] |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |
Increased credit facility commitment for either revolving credit facility or term loan facility | 50,000,000 | 50,000,000 |  |  |  |  |
Revolving Credit Loan [Member] |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |
Bank guarantee agreement outstanding amount | 20,000,000 | 20,000,000 |  |  |  |  |
Revolving Credit Loan [Member] | Amended and Restated Credit Agreement [Member] |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |
Aggregate principal amount outstanding under the credit facilities | 140,000,000 | 140,000,000 |  |  |  |  |
Letters of Credit [Member] |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |
Aggregate principal amount outstanding under the credit facilities | 11,500,000 | 11,500,000 |  |  |  |  | $ 29,300,000
Bank Guarantees [Member] |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |
Bank guarantee issuance under bilateral lines and collateral | 50,000,000 | 50,000,000 |  |  |  |  |
Bank guarantee agreement outstanding amount | 11,000,000 | 11,000,000 |  |  |  |  |
Netherlands Facility [Member] | Euro-Denominated Bank Guarantee [Member] |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |
Bank guarantee agreement outstanding amount | $ 3,400,000 | $ 3,400,000 |  |  |  |  |

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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=6877327&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=6876686&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=119400593&loc=d3e572229-122910 + Details
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