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Investments - Schedule of Investment (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Investment [Line Items]
Investments, at fair value	$ 6,756	$ 4,902
Rabbi Trust Associated With Deferred Compensation Plan [Member]
Investment [Line Items]
Investments, at fair value	6,734	4,881
Fair Value, Inputs, Level 1 [Member] \| Investments in equity securities
Investment [Line Items]
Investments, at fair value	$ 22	$ 21

- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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