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Credit Agreement - Schedule of Credit Agreement (Detail) - Credit Agreement [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Credit Agreement: |  |  |
Credit facility remaining availability |  | $ 124,082 | $ 48,582
Outstanding letters of credit |  | 918 | 1,418
Availability of additional letters of credit | [1] | $ 124,082 | $ 23,582
Line of credit facility, interest rate |  | 0.00% | 0.00%
Commitment fee rate |  | 0.30% | 0.30%
Letter of credit fee rate | [2] | 3.00% | 1.25%
[1] | The letters of credit availability under the credit agreement with Wintrust is up to the borrowing limit of $125.0 million. For the previous credit agreement with BMO Harris Bank N.A., a sublimit of $25.0 million under the credit agreement was part of, not in addition to, the $50.0 million borrowing limit under the credit agreement.
[2] | The 2021 letter of credit fee rate is based on prime minus 1.0%, subject to a minimum rate of 3.0%. The prime rate as of December 31, 2021 was 3.25%, which would yield a 2.25% fee rate, therefore the minimum rate of 3.0% is reflected in the table above.

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- Definition Line of credit facility availability for additional letters of credit. + References No definition available. + Details
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- Definition The effective interest rate during the reporting period. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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