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Debt - Additional Information (Detail) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Jan. 30, 2018
Debt Instrument [Line Items] |  |  |
Total debt | $ 198,669,000 | $ 222,103,000 |
Line of credit facility, Minimum maturity period | 1 month |  |
Line of credit facility, Maximum maturity period | 6 months |  |
Debt matures in 2021 | $ 37,857,000 |  |
Debt matures in 2022 | 37,857,000 |  |
Debt matures in 2023 | 37,857,000 |  |
Debt matures in 2024 | 28,572,000 |  |
Debt matures in 2025 | 28,572,000 |  |
Debt matures after 2025 | 28,571,000 |  |
Amount of repayments of long-term debt due in next year | 37,857,000 |  |
Amount of repayments of foreign subsidiaries short-term debt due in next year | $ 0 |  |
Minimum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Commitment fee percentage | 0.15% |  |
Minimum [Member] | LIBOR [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Spread rate | 1.25% |  |
Minimum [Member] | Prime Rate [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Spread rate | 0.25% |  |
Maximum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Commitment fee percentage | 0.325% |  |
Maximum [Member] | LIBOR [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Spread rate | 1.875% |  |
Maximum [Member] | Prime Rate [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Spread rate | 0.875% |  |
Unsecured Private Placement Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | $ 199,286,000 |  |
Maturity Dates | 12 years |  |
Debt instrument maturity dates description | The notes had original maturities of 12 years with mandatory amortization of principal beginning six years after issuance. |  |
Unsecured Private Placement Notes [Member] | Minimum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument interest rate percentage | 3.86% |  |
Unsecured Private Placement Notes [Member] | Maximum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument interest rate percentage | 4.86% |  |
Multi Currency Revolving Credit Agreement [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Revolving credit agreement | $ 350,000,000 |  | $ 350,000,000
Credit agreement secured date | Jan. 30, 2023 |  |
Letters of Credit Outstanding | $ 6,220,000 |  |
Debt Outstanding | 0 |  |
Unused Revolving credit | 343,780,000 |  |
Unrestricted retained earnings | 373,884,000 | $ 283,956,000 |
Debt of foreign subsidiaries Unsecured bank debt and Term Loan, foreign currency [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | $ 0 |  |

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- Definition Amount of repayments of foreign subsidiaries short-term debt due in next year. + References No definition available. + Details
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- Definition Amount of repayments of long-term debt due in next year. + References No definition available. + Details
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- Definition Line of credit facility maximum maturity period. + References No definition available. + Details
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- Definition Line of credit facility minimum maturity period. + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + 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 The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: 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(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: 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 4: 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 + Details
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- Definition Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24072-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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