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Investments - Summary of Available-for-Sale Investments (Detail) $ in Thousands	Dec. 31, 2017 USD ($)
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost	$ 89,683
Gross Unrealized (Losses)	(412)
Estimated Fair Value	89,271
Certificates of Deposit [Member]
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost	4,915
Gross Unrealized (Losses)	(3)
Estimated Fair Value	4,912
Municipal Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost	84,768
Gross Unrealized (Losses)	(409)
Estimated Fair Value	$ 84,359

X

- Definition

Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

No definition available.

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X

- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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No definition available.

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X

- Definition

Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer.

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No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Details

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