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Debt - Schedule of Maturity Amounts Outstanding Under Credit Agreement and Senior Unsecured Notes (Detail) - USD ($) | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020 | Dec. 14, 2020
Line of Credit Facility [Line Items] |  |  |
Borrowings under credit agreement, outstanding amount | $ 17,500,000 | $ 25,000,000 |
Borrowings under note purchase and guarantee agreement, outstanding amount | 523,907,000 | 523,828,000 |
Total debt | 542,500,000 | 550,000,000 |
Unamortized debt issuance costs, net | (1,788,000) | (2,307,000) |
Total debt, net | $ 540,712,000 | $ 547,693,000 |
Revolving Facility [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Maturity Date | Mar. 31, 2022 | Mar. 31, 2022 |
Interest Rate | 1.58% | 1.58% |
Borrowings under credit agreement, outstanding amount | $ 17,500,000 | $ 25,000,000 | $ 75,000,000
Total debt | $ 17,500,000 |  |
Series B Notes Maturing in June 2023 [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Maturity Date | Jun. 30, 2023 | Jun. 30, 2023 |
Interest Rate | 5.35% | 5.35% |
Borrowings under note purchase and guarantee agreement, outstanding amount | $ 75,000,000 | $ 75,000,000 |
Series C Notes Maturing in February 2025 [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Maturity Date | Feb. 28, 2025 | Feb. 28, 2025 |
Interest Rate | 4.75% | 4.75% |
Borrowings under note purchase and guarantee agreement, outstanding amount | $ 50,000,000 | $ 50,000,000 |
Series D Notes Maturing in June 2028 [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Maturity Date | Jun. 30, 2028 | Jun. 30, 2028 |
Interest Rate | 5.47% | 5.47% |
Borrowings under note purchase and guarantee agreement, outstanding amount | $ 50,000,000 | $ 50,000,000 |
Series E Notes Maturing in June 2028 [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Maturity Date | Jun. 30, 2028 | Jun. 30, 2028 |
Interest Rate | 5.47% | 5.47% |
Borrowings under note purchase and guarantee agreement, outstanding amount | $ 50,000,000 | $ 50,000,000 |
Series F Notes Maturing in September 2029 [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Maturity Date | Sep. 30, 2029 | Sep. 30, 2029 |
Interest Rate | 3.52% | 3.52% |
Borrowings under note purchase and guarantee agreement, outstanding amount | $ 50,000,000 | $ 50,000,000 |
Series G Notes Maturing in September 2029 [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Maturity Date | Sep. 30, 2029 | Sep. 30, 2029 |
Interest Rate | 3.52% | 3.52% |
Borrowings under note purchase and guarantee agreement, outstanding amount | $ 50,000,000 | $ 50,000,000 |
Series I Notes Maturing in November 2030 [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Maturity Date | Nov. 30, 2030 | Nov. 30, 2030 |
Interest Rate | 3.43% | 3.43% |
Borrowings under note purchase and guarantee agreement, outstanding amount | $ 100,000,000 | $ 100,000,000 |
Series H Notes Maturing in September 2029 [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Maturity Date | Sep. 30, 2029 | Sep. 30, 2029 |
Interest Rate | 3.52% | 3.52% |
Borrowings under note purchase and guarantee agreement, outstanding amount | $ 25,000,000 | $ 25,000,000 |
Series J Notes Maturing in November 2030 [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Maturity Date | Nov. 30, 2030 | Nov. 30, 2030 |
Interest Rate | 3.43% | 3.43% |
Borrowings under note purchase and guarantee agreement, outstanding amount | $ 50,000,000 | $ 50,000,000 |
Series K Notes Maturing in November 2030 [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Maturity Date | Nov. 30, 2030 | Nov. 30, 2030 |
Interest Rate | 3.43% | 3.43% |
Borrowings under note purchase and guarantee agreement, outstanding amount | $ 25,000,000 | $ 25,000,000 |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + 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)(1) -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(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 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 4: 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 + 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 Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of unamortized debt discount (premium) and debt issuance costs. + 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)(2) -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 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399 + 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, 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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