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Investments - Summary of Investments (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost	$ 69,192	$ 89,683
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	(438)	(412)
Estimated Fair Value	68,754	89,271
Certificates of Deposit [Member]
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost		4,915
Gross Unrealized Gains		0
Gross Unrealized (Losses)		(3)
Estimated Fair Value		4,912
Municipal Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost	69,192	84,768
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	(438)	(409)
Estimated Fair Value	$ 68,754	$ 84,359

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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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

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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.

+ References

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