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Investment Portfolio - Narrative (Detail) | Sep. 30, 2016 USD ($)
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Investments, Debt and Equity Securities [Abstract] |
Fair value of investment | $ 87,000,000
Schedule of Trading Securities and Other Trading Assets [Line Items] |
Deferred compensation investments | 13,369,919
Trading Securities [Member] |
Schedule of Trading Securities and Other Trading Assets [Line Items] |
Deferred compensation investments | 8,900,000
Equity Method Investments [Member] |
Schedule of Trading Securities and Other Trading Assets [Line Items] |
Deferred compensation investments | $ 4,500,000

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