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Goodwill and Intangible Assets - Schedule of Gross Carrying Value and Accumulated Amortization for Each Major Class of Intangible Asset (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Goodwill And Intangible Assets [Line Items] |  |
Amortized intangible assets - Gross Carrying Amount | $ 484,175 | $ 536,160
Intangible assets - Gross Carrying Amount | 575,075 | 627,060
Amortized intangible assets - Accumulated Amortization | (179,578) | (212,314)
Amortized intangible assets - Net | 304,597 | 323,846
Intangible assets - Net | 395,497 | 414,746
Banjo trade name |  |
Goodwill And Intangible Assets [Line Items] |  |
Indefinite lived intangible assets - Net | 62,100 | 62,100
Akron Brass trade name |  |
Goodwill And Intangible Assets [Line Items] |  |
Indefinite lived intangible assets - Net | 28,800 | 28,800
Patents |  |
Goodwill And Intangible Assets [Line Items] |  |
Amortized intangible assets - Gross Carrying Amount | 9,640 | 9,633
Amortized intangible assets - Accumulated Amortization | (7,789) | (7,143)
Amortized intangible assets - Net | $ 1,851 | 2,490
Amortized intangible assets - Weighted Average Life | 12 years |
Trade names |  |
Goodwill And Intangible Assets [Line Items] |  |
Amortized intangible assets - Gross Carrying Amount | $ 116,895 | 117,206
Amortized intangible assets - Accumulated Amortization | (55,799) | (50,604)
Amortized intangible assets - Net | $ 61,096 | 66,602
Amortized intangible assets - Weighted Average Life | 16 years |
Customer relationships |  |
Goodwill And Intangible Assets [Line Items] |  |
Amortized intangible assets - Gross Carrying Amount | $ 258,789 | 317,316
Amortized intangible assets - Accumulated Amortization | (81,485) | (124,566)
Amortized intangible assets - Net | $ 177,304 | 192,750
Amortized intangible assets - Weighted Average Life | 14 years |
Unpatented technology |  |
Goodwill And Intangible Assets [Line Items] |  |
Amortized intangible assets - Gross Carrying Amount | $ 98,151 | 91,166
Amortized intangible assets - Accumulated Amortization | (34,015) | (29,428)
Amortized intangible assets - Net | $ 64,136 | 61,738
Amortized intangible assets - Weighted Average Life | 12 years |
Other |  |
Goodwill And Intangible Assets [Line Items] |  |
Amortized intangible assets - Gross Carrying Amount | $ 700 | 839
Amortized intangible assets - Accumulated Amortization | (490) | (573)
Amortized intangible assets - Net | $ 210 | $ 266
Amortized intangible assets - Weighted Average Life | 10 years |

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