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Investments in Debt and Equity Securities - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Available for sale investments gross pre-tax unrealized gain (loss) | $ 2,589 | $ 5,181
Proceeds from sale of investments available-for-sale | 1,295 | 1,262
Pre tax reclassification of net investment realized gain (loss) into net income | 618 | 340
Reclassification of net investment realized gain (loss) into net income, net of tax | 377 | 207
Certificates of deposit, commercial paper and money market funds |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Unrealized gain (loss) on investments, pre tax | $ (1,974) | $ 425

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