Restructuring - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) Facility	Sep. 30, 2018 USD ($)
Restructuring Cost And Reserve [Line Items]
Restructuring expenses	$ 8,664,000	$ 5,818,000	$ 11,809,000	$ 12,898,000
Impairment loss	837,000	11,476,000	21,206,000	11,476,000
Manufacturing Footprint Rationalization | Minimum
Restructuring Cost And Reserve [Line Items]
Restructuring and related cost expected total cost	20,000,000		20,000,000
Manufacturing Footprint Rationalization | Maximum
Restructuring Cost And Reserve [Line Items]
Restructuring and related cost expected total cost	24,000,000		24,000,000
Advanced Research and Development Rationalization and Site Consolidation
Restructuring Cost And Reserve [Line Items]
Restructuring expenses			4,669,000
Impairment loss	0		425,000
GPT and CSZ-IC
Restructuring Cost And Reserve [Line Items]
Restructuring expenses			2,173,000
Employee Separation Costs
Restructuring Cost And Reserve [Line Items]
Restructuring expenses		3,303,000	8,177,000	5,040,000
Employee Separation Costs | Manufacturing Footprint Rationalization
Restructuring Cost And Reserve [Line Items]
Restructuring expenses	5,200,000
Restructuring reserve accelerated depreciation and fixed asset impairment	1,612,000
Employee Separation Costs | Manufacturing Footprint Rationalization | Minimum
Restructuring Cost And Reserve [Line Items]
Restructuring and related cost expected total cost	9,000,000		9,000,000
Employee Separation Costs | Manufacturing Footprint Rationalization | Maximum
Restructuring Cost And Reserve [Line Items]
Restructuring and related cost expected total cost	11,000,000		11,000,000
Employee Separation Costs | Other Restructuring Activities
Restructuring Cost And Reserve [Line Items]
Restructuring expenses	1,467,000		2,726,000
Employee Separation Costs | Advanced Research and Development Rationalization and Site Consolidation
Restructuring Cost And Reserve [Line Items]
Restructuring expenses		157,000		1,038,000
Employee Separation Costs | GPT and CSZ-IC
Restructuring Cost And Reserve [Line Items]
Restructuring expenses	0	262,000	251,000	472,000
Cash Expenditures | Manufacturing Footprint Rationalization | Minimum
Restructuring Cost And Reserve [Line Items]
Restructuring and related cost expected total cost	17,000,000		17,000,000
Cash Expenditures | Manufacturing Footprint Rationalization | Maximum
Restructuring Cost And Reserve [Line Items]
Restructuring and related cost expected total cost	21,000,000		21,000,000
Restructuring Capital Expenditures | Manufacturing Footprint Rationalization | Minimum
Restructuring Cost And Reserve [Line Items]
Restructuring and related cost expected total cost	4,500,000		4,500,000
Restructuring Capital Expenditures | Manufacturing Footprint Rationalization | Maximum
Restructuring Cost And Reserve [Line Items]
Restructuring and related cost expected total cost	5,500,000		5,500,000
Accelerated Depreciation and Impairment
Restructuring Cost And Reserve [Line Items]
Restructuring expenses			2,037,000
Accelerated Depreciation and Impairment | Manufacturing Footprint Rationalization
Restructuring Cost And Reserve [Line Items]
Restructuring and related cost expected total cost	3,000,000		3,000,000
Other Restructuring
Restructuring Cost And Reserve [Line Items]
Restructuring expenses			1,595,000
Other Restructuring | Manufacturing Footprint Rationalization | Minimum
Restructuring Cost And Reserve [Line Items]
Restructuring and related cost expected total cost	3,500,000		3,500,000
Other Restructuring | Manufacturing Footprint Rationalization | Maximum
Restructuring Cost And Reserve [Line Items]
Restructuring and related cost expected total cost	4,500,000		4,500,000
Other Restructuring | Other Restructuring Activities
Restructuring Cost And Reserve [Line Items]
Restructuring expenses	385,000		734,000
Other Restructuring | Advanced Research and Development Rationalization and Site Consolidation
Restructuring Cost And Reserve [Line Items]
Restructuring expenses		589,000		1,024,000
Other Restructuring | GPT and CSZ-IC
Restructuring Cost And Reserve [Line Items]
Restructuring expenses	$ 0	125,000	$ 861,000	125,000
Consultant Costs
Restructuring Cost And Reserve [Line Items]
Restructuring expenses		1,332,000		2,831,000
Loss on the Sale of Battery Management Systems | Advanced Research and Development Rationalization and Site Consolidation
Restructuring Cost And Reserve [Line Items]
Restructuring expenses		1,107,000		1,107,000
Asset Disposal Costs | Advanced Research and Development Rationalization and Site Consolidation
Restructuring Cost And Reserve [Line Items]
Restructuring expenses		$ 50,000		$ 1,250,000
Facility Closing | Advanced Research and Development Rationalization and Site Consolidation
Restructuring Cost And Reserve [Line Items]
Number of leased facilities vacated | Facility			2