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Investments - Summary of Available-for-Sale Debt Securities and Equity Securities (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Schedule Of Available For Sale Securities [Line Items]
Proceeds from sales and maturities (fair value)			$ 8,285	$ 75,027
Available-for-Sale Debt Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Proceeds from sales and maturities (fair value)	$ 32,287	$ 49,762	225,989	100,413
Gross realized gains on sale of securities	1	302	318	330
Gross realized losses on sale of securities	(11)	(19)	(3,125)	(59)
Equity Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Proceeds from sales and maturities (fair value)	4,158	18,056	8,285	75,027
Gross realized gains on sale of securities	$ 413	547	$ 714	2,332
Gross realized losses on sale of securities		$ (27)		$ (153)

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- Definition

Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
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