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Investments - Schedule of Investments (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Schedule of Held-to-maturity Securities [Line Items] |  |
Short-Term | $ 21,923 | $ 10,292
Long-Term | 69,699 | 80,682
Municipal Debt Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Short-Term | 18,473 | 8,312
Long-Term | 30,841 | 46,195
Federal Home Loan Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Short-Term | 2,000 | 1,000
Long-Term | 34,393 | 30,322
Certificates of Deposit [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Short-Term | 1,450 | 980
Long-Term | $ 4,465 | $ 4,165

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