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Borrowing Limits Amounts Outstanding and Amounts Available under Revolving Credit Facility (Detail) - USD ($) | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Short-Term Borrowings Outstanding | $ 76,600,000 | $ 81,900,000 | $ 47,900,000
Revolving Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Revolving credit facility | 120,000,000 | 120,000,000 | 120,000,000
Short-Term Borrowings Outstanding | 76,600,000 | 81,900,000 | 47,900,000
Letters of Credit Outstanding | 1,100,000 | 1,100,000 |
Available revolving credit facility | $ 42,300,000 | $ 37,000,000 | $ 72,100,000

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