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Borrowing Limits Amounts Outstanding and Amounts Available under Revolving Credit Facility (Detail) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Instrument [Line Items] |  |
Short-Term Borrowings Outstanding | $ 82,800,000 | $ 38,300,000
Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Revolving credit facility, limit | 120,000,000 | 120,000,000
Short-Term Borrowings Outstanding | 82,800,000 | 38,300,000
Letters of Credit Outstanding | 0 | 0
Available revolving credit facility | $ 37,200,000 | $ 81,700,000

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