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Goodwill and Other Intangible Assets Components of Other Intangible Assets (Detail) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Amortizable: |  |
Gross amortized other intangible assets | $ 521,281 | $ 193,137
Accumulated Amortization | (84,312) | (76,634)
Net amortized other intangible assets | 436,969 | 116,503
Total other intangible assets, net | $ 877,945 | 347,212
Non-compete agreements |  |
Amortizable: |  |
Total estimated life | 4 years |
Gross amortized other intangible assets | $ 2,370 | 540
Dealer/customer related |  |
Amortizable: |  |
Gross amortized other intangible assets | $ 505,543 | 169,694
Dealer/customer related | Minimum |  |
Amortizable: |  |
Total estimated life | 5 years |
Dealer/customer related | Maximum |  |
Amortizable: |  |
Total estimated life | 20 years |
Developed technology |  |
Amortizable: |  |
Gross amortized other intangible assets | $ 13,368 | 22,903
Developed technology | Minimum |  |
Amortizable: |  |
Total estimated life | 5 years |
Developed technology | Maximum |  |
Amortizable: |  |
Total estimated life | 7 years |
Brand names |  |
Non-amortizable—indefinite lived: |  |
Non-amortizable, Net | $ 440,976 | $ 230,709

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