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Investments - Schedule of Investments (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Schedule of Held-to-maturity Securities [Line Items] |  |
Short-Term | $ 10,292 | $ 11,286
Long-Term | 80,682 | 78,975
Municipal Debt Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Short-Term | 8,312 | 10,306
Long-Term | 46,195 | 46,513
Federal Home Loan Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Short-Term | 1,000 |
Long-Term | 30,322 | 28,747
Certificates of Deposit [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Short-Term | 980 | 980
Long-Term | $ 4,165 | $ 3,715

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