The Company and Subsequent Events - Additional Information (Detail)	3 Months Ended		4 Months Ended	6 Months Ended		12 Months Ended
	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Oct. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)	Jun. 30, 2018 USD ($) Facility	Dec. 31, 2017 USD ($)
Company And Subsequent Events [Line Items]
Restructuring expenses		$ 6,215,000			$ 7,080,000
Statutory Federal income tax rate					21.00%	35.00%
Tax cuts and jobs act of 2017, incomplete accounting, provisional income tax expense					$ 0	$ 20,153,000
Tax cuts and jobs act of 2017, incomplete accounting, change in tax rate, deferred tax balances, provisional income tax expense						5,808,000
Tax cuts and jobs act of 2017, incomplete accounting, provisional income tax expense related to onetime transition tax liability of foreign subsidiaries						23,923,000
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						$ 9,578,000
Automotive Segments
Company And Subsequent Events [Line Items]
Restructuring expenses					3,247,000
Industrial Segments
Company And Subsequent Events [Line Items]
Restructuring expenses					3,833,000
One-Time Employee Termination Benefit Costs
Company And Subsequent Events [Line Items]
Restructuring expenses					2,828,000
Contract Termination Costs
Company And Subsequent Events [Line Items]
Restructuring expenses					446,000
Asset Disposal Costs
Company And Subsequent Events [Line Items]
Restructuring expenses					2,307,000
Fit-for-Growth | Consultant Costs
Company And Subsequent Events [Line Items]
Restructuring expenses					1,499,000
Fit-for-Growth | One-Time Employee Termination Benefit Costs
Company And Subsequent Events [Line Items]
Restructuring expenses		1,737,000			1,737,000
Fit-for-Growth | Contract Termination Costs
Company And Subsequent Events [Line Items]
Restructuring expenses					11,000
Fit-for-Growth | Scenario Forecast | Consultant Costs
Company And Subsequent Events [Line Items]
Restructuring expenses				$ 840,000
Advanced Research and Development Rationalization and Site Consolidation | One-Time Employee Termination Benefit Costs
Company And Subsequent Events [Line Items]
Restructuring expenses					881,000
Advanced Research and Development Rationalization and Site Consolidation | Loss on the Sale of Battery Management Systems
Company And Subsequent Events [Line Items]
Restructuring expenses		1,107,000			1,107,000
Advanced Research and Development Rationalization and Site Consolidation | Termination of 1 Leased Facility
Company And Subsequent Events [Line Items]
Restructuring expenses		435,000			$ 435,000
Number of leased facilities vacated | Facility					1
Number of leased facilities closure | Facility					2
Advanced Research and Development Rationalization and Site Consolidation | Asset Disposal Costs
Company And Subsequent Events [Line Items]
Restructuring expenses		$ 1,200,000			$ 1,200,000
Advanced Research and Development Rationalization and Site Consolidation | Scenario Forecast | One-Time Employee Termination Benefit Costs
Company And Subsequent Events [Line Items]
Restructuring expenses			$ 166,000
Advanced Research and Development Rationalization and Site Consolidation | Scenario Forecast | Termination of 1 Leased Facility
Company And Subsequent Events [Line Items]
Restructuring expenses	$ 537,000
GPT and CSZ-IC | One-Time Employee Termination Benefit Costs
Company And Subsequent Events [Line Items]
Restructuring expenses					$ 210,000