The Company and Subsequent Events - Additional Information (Detail) $ in Thousands	3 Months Ended		9 Months Ended	12 Months Ended
	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2018 USD ($) Facility	Dec. 31, 2017 USD ($)
Company And Subsequent Events [Line Items]
Restructuring expenses		$ 5,818	$ 12,898
Tax cuts and jobs act of 2017, incomplete accounting, provisional income tax expense			19,997	$ 20,153
Tax cuts and jobs act of 2017, incomplete accounting, change in tax rate, deferred tax balances, provisional income tax expense			4,950
Tax cuts and jobs act of 2017, incomplete accounting, provisional income tax expense related to onetime transition tax liability of foreign subsidiaries			24,625
Tax cuts and jobs act of 2017, incomplete accounting, benefit included in provision for income taxes to offset one-time transition tax related to previous deferred tax liability that existed for undistributed foreign earnings that were not permanently reinvested				$ 9,578
Automotive Segments
Company And Subsequent Events [Line Items]
Restructuring expenses		4,332	7,578
Industrial Segments
Company And Subsequent Events [Line Items]
Restructuring expenses		1,486	5,320
One-Time Employee Termination Benefit Costs
Company And Subsequent Events [Line Items]
Restructuring expenses			6,550
Contract Termination Costs
Company And Subsequent Events [Line Items]
Restructuring expenses			1,035
Asset Disposal Costs
Company And Subsequent Events [Line Items]
Restructuring expenses			2,357
Fit-for-Growth | Consultant Costs
Company And Subsequent Events [Line Items]
Restructuring expenses		1,332	2,831
Fit-for-Growth | One-Time Employee Termination Benefit Costs
Company And Subsequent Events [Line Items]
Restructuring expenses		3,303	5,040
Fit-for-Growth | One-Time Employee Termination Benefit Costs | Scenario Forecast
Company And Subsequent Events [Line Items]
Restructuring expenses	$ 1,220
Fit-for-Growth | Contract Termination Costs
Company And Subsequent Events [Line Items]
Restructuring expenses		0	11
Advanced Research and Development Rationalization and Site Consolidation | One-Time Employee Termination Benefit Costs
Company And Subsequent Events [Line Items]
Restructuring expenses		157	1,038
Advanced Research and Development Rationalization and Site Consolidation | Contract Termination Costs
Company And Subsequent Events [Line Items]
Restructuring expenses		589	1,024
Advanced Research and Development Rationalization and Site Consolidation | Loss on the Sale of Battery Management Systems
Company And Subsequent Events [Line Items]
Restructuring expenses			$ 1,107
Advanced Research and Development Rationalization and Site Consolidation | Facility Closing
Company And Subsequent Events [Line Items]
Number of leased facilities vacated | Facility			2
Advanced Research and Development Rationalization and Site Consolidation | Asset Disposal Costs
Company And Subsequent Events [Line Items]
Restructuring expenses		50	$ 1,250
GPT and CSZ-IC | Consultant Costs
Company And Subsequent Events [Line Items]
Restructuring expenses		125
GPT and CSZ-IC | One-Time Employee Termination Benefit Costs
Company And Subsequent Events [Line Items]
Restructuring expenses		$ 262	$ 472