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Borrowing Limits Amounts Outstanding and Amounts Available under Revolving Credit Facility (Detail) - USD ($) | Sep. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Short-Term Borrowings Outstanding | $ 49,200,000 | $ 82,800,000 | $ 69,100,000
Revolving Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Revolving credit facility, limit | 120,000,000.0 | 120,000,000.0 | 120,000,000.0
Short-Term Borrowings Outstanding | 49,200,000 | 82,800,000 | 69,100,000
Letters of Credit Outstanding | 100,000 |  |
Available revolving credit facility | $ 70,700,000 | $ 37,200,000 | $ 50,900,000

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