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Borrowing Limits Amounts Outstanding and Amounts Available under Revolving Credit Facility (Detail) - USD ($) | Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Short-Term Borrowings Outstanding | $ 36,900,000 | $ 42,000,000 | $ 4,100,000
Revolving Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Revolving credit facility | 120,000,000 | 120,000,000 | 120,000,000
Short-Term Borrowings Outstanding | 36,900,000 | 42,000,000 | 4,100,000
Letters of Credit Outstanding | 1,100,000 |  |
Available revolving credit facility | $ 82,000,000 | $ 78,000,000 | $ 115,900,000

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