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Debt - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Line of Credit Facility [Line Items] |  |
Company indebtedness | $ 0 | $ 0
Remaining available borrowing capacity | $ 200,000,000 |
Third Amended and Restated Credit Agreement [Member] |  |
Line of Credit Facility [Line Items] |  |
Termination date of the Credit Agreement | Jan. 12, 2021 |
Third Amended and Restated Credit Agreement [Member] | Federal Funds Rate [Member] |  |
Line of Credit Facility [Line Items] |  |
Interest rate | 0.50% |
Third Amended and Restated Credit Agreement [Member] | Eurodollar Rate Loans [Member] |  |
Line of Credit Facility [Line Items] |  |
Interest rate | 1.00% |
Fourth Amended And Restated Credit Agreement [Member] |  |
Line of Credit Facility [Line Items] |  |
Termination date of the Credit Agreement | Nov. 05, 2024 |
Fourth Amended And Restated Credit Agreement [Member] | Federal Funds Rate [Member] |  |
Line of Credit Facility [Line Items] |  |
Interest rate | 0.50% |
Fourth Amended And Restated Credit Agreement [Member] | Eurodollar Rate Loans [Member] |  |
Line of Credit Facility [Line Items] |  |
Interest rate | 1.00% |
Revolver Loans Portion Effective January 1 through June 30 [Member] | Third Amended and Restated Credit Agreement [Member] |  |
Line of Credit Facility [Line Items] |  |
Revolving loans in a collective maximum principal amount | $ 250,000,000 |
Revolver Loans Portion Effective January 1 through June 30 [Member] | Fourth Amended And Restated Credit Agreement [Member] |  |
Line of Credit Facility [Line Items] |  |
Revolving loans in a collective maximum principal amount | 250,000,000 |
Revolver Loans Portion Effective July 1 through December 31 [Member] | Third Amended and Restated Credit Agreement [Member] |  |
Line of Credit Facility [Line Items] |  |
Revolving loans in a collective maximum principal amount | 200,000,000 |
Revolver Loans Portion Effective July 1 through December 31 [Member] | Fourth Amended And Restated Credit Agreement [Member] |  |
Line of Credit Facility [Line Items] |  |
Revolving loans in a collective maximum principal amount | 200,000,000 |
Revolving Credit Facility [Member] | Letter of Credit Facility Sublimit [Member] |  |
Line of Credit Facility [Line Items] |  |
Revolving loans in a collective maximum principal amount | 15,000,000 |
Revolving Credit Facility [Member] | Swing Advance Loan Sublimit [Member] |  |
Line of Credit Facility [Line Items] |  |
Revolving loans in a collective maximum principal amount | $ 5,000,000 |

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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=109500613&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=119400593&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=6877327&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=6876686&loc=d3e534808-122878 + Details
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