The Company - Additional Information (Detail)		3 Months Ended		12 Months Ended
	Feb. 01, 2019 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) Facility Segment	Dec. 31, 2016 USD ($)
Nature Of Company [Line Items]
Restructuring expenses				$ 14,772,000
Amount paid withholding taxes in Canadian Revenue Agency					$ 7,600,000
Income tax expense related to intercompany dividends			$ 2,500,000		2,500,000
Accrued one-time income tax payment			$ 32,600,000		$ 32,600,000
Payments for reorganization				$ 0
Number of reportable segments | Segment				2
Automotive Segments
Nature Of Company [Line Items]
Restructuring expenses				$ 9,164,000
Industrial Segments
Nature Of Company [Line Items]
Restructuring expenses				5,608,000
One-Time Employee Termination Benefit Costs
Nature Of Company [Line Items]
Restructuring expenses				8,449,000
Contract Termination Costs
Nature Of Company [Line Items]
Restructuring expenses				660,000
Asset Disposal Costs
Nature Of Company [Line Items]
Restructuring expenses				2,507,000
Fit-for-Growth | Consultant Costs
Nature Of Company [Line Items]
Restructuring expenses				2,852,000
Fit-for-Growth | One-Time Employee Termination Benefit Costs
Nature Of Company [Line Items]
Restructuring expenses				6,598,000
Fit-for-Growth | Contract Termination Costs
Nature Of Company [Line Items]
Restructuring expenses				17,000
Advanced Research and Development Rationalization and Site Consolidation | One-Time Employee Termination Benefit Costs
Nature Of Company [Line Items]
Restructuring expenses				1,094,000
Advanced Research and Development Rationalization and Site Consolidation | Contract Termination Costs
Nature Of Company [Line Items]
Restructuring expenses				643,000
Advanced Research and Development Rationalization and Site Consolidation | Loss on the Sale of Battery Management Systems
Nature Of Company [Line Items]
Restructuring expenses				$ 1,107,000
Advanced Research and Development Rationalization and Site Consolidation | Facility Closing
Nature Of Company [Line Items]
Number of leased facilities vacated | Facility				2
Advanced Research and Development Rationalization and Site Consolidation | Asset Disposal Costs
Nature Of Company [Line Items]
Restructuring expenses				$ 1,400,000
GPT and CSZ-IC | Consultant Costs
Nature Of Company [Line Items]
Restructuring expenses				304,000
GPT and CSZ-IC | One-Time Employee Termination Benefit Costs
Nature Of Company [Line Items]
Restructuring expenses				$ 757,000
Subsequent Event | Fit-for-Growth | Consultant Costs
Nature Of Company [Line Items]
Restructuring expenses		$ 600,000
Subsequent Event | CSZ-IC
Nature Of Company [Line Items]
Total cash proceeds	$ 47,500,000