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Segment Reporting - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) Customer	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Nov. 01, 2017 USD ($)
Segment Reporting Information [Line Items]
Goodwill	$ 69,685	$ 51,735	$ 27,765
Reimbursed research and development costs	12,037	6,660	9,607
Selling, general and administrative costs	130,522	115,252	95,456
Acquisition transaction expenses	$ 789	743
Number of customers | Customer	3
United States
Segment Reporting Information [Line Items]
Number of customers | Customer	2
Foreign
Segment Reporting Information [Line Items]
Number of customers | Customer	1
Automotive Segments
Segment Reporting Information [Line Items]
Goodwill	$ 38,912	20,962
Industrial Segments
Segment Reporting Information [Line Items]
Goodwill	30,773	30,773
Reimbursed research and development costs	2,116	641	2,483
Selling, general and administrative costs	43,457	39,059	32,116
Acquisition transaction expenses	$ 789	$ 743	$ 0
Etratech Inc.
Segment Reporting Information [Line Items]
Date of acquisition	Nov. 01, 2017
Goodwill				$ 14,866

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