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Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2017 | Oct. 01, 2016 | Sep. 30, 2017 | Oct. 01, 2016 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 31, 2016
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill | $ 924,000,000 |  | $ 924,000,000 |  |  |  | $ 895,500,000
Gross carrying value, Total | 413,200,000 |  | 413,200,000 |  |  |  | 367,900,000
Non-amortized trademarks | 115,800,000 |  | 115,800,000 |  |  |  | 64,200,000
Accumulated impairment losses | 0 |  | $ 0 |  |  |  |
Weighted-average amortization period (in years) |  |  | 11 years |  |  |  |
Aggregate amortization expense | 7,100,000 | $ 5,900,000 | $ 20,700,000 | $ 18,200,000 |  |  |
Estimated annual amortization expense for fiscal period 2017 | 27,600,000 |  | 27,600,000 |  |  |  |
Estimated annual amortization expense for fiscal period 2018 | 26,300,000 |  | 26,300,000 |  |  |  |
Estimated annual amortization expense for fiscal period 2019 | 22,700,000 |  | 22,700,000 |  |  |  |
Estimated annual amortization expense for fiscal period 2020 | 18,000,000 |  | 18,000,000 |  |  |  |
Estimated annual amortization expense for fiscal period 2021 | 14,700,000 |  | 14,700,000 |  |  |  |
Estimated annual amortization expense for fiscal period 2022 | 9,900,000 |  | 9,900,000 |  |  |  |
Repair Systems & Information Group [Member] |  |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill | 614,300,000 |  | 614,300,000 |  |  |  | 640,600,000
Commercial & Industrial Group [Member] |  |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill | 297,200,000 |  | 297,200,000 |  |  |  | 242,400,000
BTC [Member] |  |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill | 5,900,000 |  | 5,900,000 |  | $ 5,900,000 |  |
Car-O-Liner Holding AB [Member] |  |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill | 77,700,000 |  | 77,700,000 |  |  |  |
Car-O-Liner Holding AB [Member] | Repair Systems & Information Group [Member] |  |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill | 76,900,000 |  | 76,900,000 |  |  |  |
Car-O-Liner Holding AB [Member] | Commercial & Industrial Group [Member] |  |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill | 800,000 |  | 800,000 |  |  |  |
Car-O-Liner Holding AB [Member] | Trademarks [Member] |  |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Gross carrying value, Total |  |  | 30,200,000 |  |  |  |
Ryeson Corporation [Member] |  |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill | 5,000,000 |  | 5,000,000 |  |  | $ 5,000,000 |
Norbar [Member] |  |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill | 23,700,000 |  | 23,700,000 |  |  |  |
Torque Control Specialist [Member] |  |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill | 1,900,000 |  | 1,900,000 |  |  |  |
Customer relationships [Member] |  |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Gross carrying value, Total | 175,500,000 |  | $ 175,500,000 |  |  |  | $ 142,600,000
Weighted-average amortization period (in years) |  |  | 15 years |  |  |  |
Customer relationship contractual term, minimum (in years) |  |  | 3 years |  |  |  |
Customer relationship contractual term, maximum (in years) |  |  | 5 years |  |  |  |
Customer relationships [Member] | BTC [Member] |  |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Gross carrying value, Total | 1,200,000 |  | $ 1,200,000 |  |  |  |
Customer relationships [Member] | Car-O-Liner Holding AB [Member] |  |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Gross carrying value, Total | 29,100,000 |  | 29,100,000 |  |  |  |
Customer relationships [Member] | Norbar [Member] |  |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Gross carrying value, Total | $ 1,100,000 |  | 1,100,000 |  |  |  |
BTC [Member] | Trademarks [Member] |  |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Gross carrying value, Total |  |  | 2,100,000 |  |  |  |
Norbar [Member] | Trademarks [Member] |  |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Gross carrying value, Total |  |  | $ 16,900,000 |  |  |  |

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