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Credit Agreement - Schedule of Credit Agreement (Detail) - Credit Agreement [Member] - USD ($)
$ in Thousands
12 Months Ended
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.