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Investments - Schedule of Investments (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Schedule of Held-to-maturity Securities [Line Items] |  |
Short-Term | $ 11,286 | $ 8,853
Long-Term | 78,975 | 63,288
Municipal Debt Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Short-Term | 10,306 | 8,608
Long-Term | 46,513 | 34,858
Federal Home Loan Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Long-Term | 28,747 | 26,715
Certificates of Deposit [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Short-Term | 980 | 245
Long-Term | $ 3,715 | $ 1,715

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