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Borrowing Limits Amounts Outstanding and Amounts Available under Revolving Credit Facility (Detail) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Instrument [Line Items] |  |
Short-Term Borrowings Outstanding | $ 54,700,000 | $ 58,600,000
Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Revolving credit facility, limit | 120,000,000.0 | 120,000,000.0
Short-Term Borrowings Outstanding | 54,700,000 | 58,600,000
Letters of Credit Outstanding | 100,000 | 100,000
Available revolving credit facility | $ 65,200,000 | $ 61,300,000

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