Acquisitions and Divestitures - Summary of Preliminary Allocation (Detail) - USD ($) $ in Thousands		9 Months Ended
	Apr. 01, 2019	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Business Acquisition [Line Items]
Purchase price, cash consideration, net of cash acquired		$ 14,823	$ 15
Goodwill		$ 63,501		$ 55,311
Stihler Electronic GmbH
Business Acquisition [Line Items]
Purchase price, cash consideration, net of cash acquired	$ 14,823
Business combination future contingent consideration milestone payment	653
Total purchase price, net of cash acquired	15,476
Accounts receivable	883
Inventory	1,698
Prepaid expenses and other assets	241
Operating lease right-of-use assets	263
Property and equipment	260
Other intangible assets	4,380
Goodwill	9,816
Assumed liabilities	(2,065)
Net assets acquired	$ 15,476