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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 |

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