Investment In Joint Venture - Summary of Changes In Investment In Joint Venture (Detail) $ in Thousands	12 Months Ended
Dec. 31, 2017 USD ($)
Schedule Of Equity Method Investments [Line Items]
Company's share of earnings	$ 390
Dividend received	(176)
Carrying value, end of year	3,383
Xuzhou-PAT Control Technologies Limited [Member]
Schedule Of Equity Method Investments [Line Items]
Acquisition through business combination (Note 3)	3,036
Currency gain on financial statement translation	133
Company's share of earnings	390
Dividend received	(176)
Carrying value, end of year	$ 3,383

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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- Definition

Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

+ References

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- Definition

Amount of distribution received from equity method investee for return of investment, classified as investing activities. Excludes distribution for return on investment, classified as operating activities.

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