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Fair Value Measurements - Assets Measured for at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Debt Securities | $ 820,438 | $ 649,334
Equity securities | 63,277 | 62,215
Mortgage-backed and asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Debt Securities | 309,597 | 219,452
Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments |  | 10,000
Total assets accounted for at fair value | 883,715 | 711,549
Fair Value, Measurements, Recurring | U.S. government obligations and agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Debt Securities | 66,637 | 59,604
Fair Value, Measurements, Recurring | Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Debt Securities | 428,865 | 227,504
Fair Value, Measurements, Recurring | Mortgage-backed and asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Debt Securities | 309,597 | 219,452
Fair Value, Measurements, Recurring | Municipal bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Debt Securities | 3,362 | 120,295
Fair Value, Measurements, Recurring | Redeemable preferred stock |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Debt Securities | 11,977 | 12,479
Fair Value, Measurements, Recurring | Common stock |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 15,564 | 18,811
Fair Value, Measurements, Recurring | Mutual funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 47,713 | 43,404
Level 1 | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets accounted for at fair value | 63,277 | 62,215
Level 1 | Fair Value, Measurements, Recurring | Common stock |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 15,564 | 18,811
Level 1 | Fair Value, Measurements, Recurring | Mutual funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 47,713 | 43,404
Level 2 | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments |  | 10,000
Total assets accounted for at fair value | 820,438 | 649,334
Level 2 | Fair Value, Measurements, Recurring | U.S. government obligations and agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Debt Securities | 66,637 | 59,604
Level 2 | Fair Value, Measurements, Recurring | Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Debt Securities | 428,865 | 227,504
Level 2 | Fair Value, Measurements, Recurring | Mortgage-backed and asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Debt Securities | 309,597 | 219,452
Level 2 | Fair Value, Measurements, Recurring | Municipal bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Debt Securities | 3,362 | 120,295
Level 2 | Fair Value, Measurements, Recurring | Redeemable preferred stock |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Debt Securities | $ 11,977 | $ 12,479

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