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Contingencies - Additional Information (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 31, 2017 USD ($) | Sep. 30, 2019 USD ($) lawsuit | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) lawsuit insurance_carrier | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) lawsuit | Dec. 31, 2017 USD ($) lawsuit
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Product liability expense |  | $ 1,730 | $ 14,627 | $ 8,155 | $ 25,469 |  |
Loss contingency, years of activity |  |  |  | 5 years |  |  |
Minimum number of insurance carriers | insurance_carrier |  |  |  | 20 |  |  |
Insurance receivables |  | 57,900 |  | $ 57,900 |  | $ 71,700 | $ 134,700
Insurance receivables, current |  | 9,900 |  | 9,900 |  | 14,800 |
Insurance receivables, noncurrent |  | 48,000 |  | 48,000 |  | 56,900 |
Notes receivable from insurance companies |  | 55,600 |  | 55,600 |  | 59,600 | $ 76,900
Notes receivable from insurance companies, current |  | 3,646 |  | 3,646 |  | 3,555 |
Amount reported in notes receivable, insurance companies, noncurrent |  | 52,000 |  | 52,000 |  | 56,000 |
Product warranty expense |  |  |  | 8,800 | 7,900 |  |
Single Incident |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Product liability accrual |  | $ 3,000 |  | 3,000 |  | $ 3,600 |
Product liability expense |  |  |  | $ (600) | 1,300 |  |
Lawsuit |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Number of lawsuits | lawsuit |  | 1,591 |  | 1,591 |  | 1,481 | 1,420
Damages from Product Defects |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Number of lawsuits | lawsuit |  | 2,493 |  | 2,493 |  | 2,355 | 2,242
Cumulative Trauma |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Product liability accrual |  | $ 151,600 |  | $ 151,600 |  | $ 187,300 |
Product liability expense |  |  |  | 9,600 |  |  |
Claims Settled, But Not Yet Paid |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Product liability accrual |  | 9,500 |  | 9,500 |  | 24,500 |
Uninsured Cumulative Trauma |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Product liability expense |  |  |  | 8,600 | $ 25,500 |  |
Other Current Liabilities | Cumulative Trauma |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Product liability accrual |  | 10,400 |  | 10,400 |  | 38,800 |
Other Noncurrent Liabilities | Cumulative Trauma |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Product liability accrual |  |  |  |  |  | 148,500 |
Other Noncurrent Liabilities | Cumulative Trauma, Reported Claims |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Product liability, gross |  | $ 141,200 |  | 141,200 |  |  |
Settled Litigation |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Damages awarded | $ 75,200 |  |  |  |  |  |
Payments to resolve cumulative trauma claims |  |  |  | $ 21,400 |  | $ 28,600 |

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