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Acquisitions - Additional Information (Detail) - USD ($) |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Nov. 16, 2016 | Oct. 31, 2016 | Jul. 27, 2015 | May 28, 2014 | Dec. 31, 2016 | Jan. 02, 2016 | Jan. 03, 2015
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash purchase price of acquisition |  |  |  |  | $ 160,400,000 | $ 11,800,000 | $ 41,300,000
Goodwill recorded on a preliminary basis |  |  |  |  | 895,500,000 | $ 790,100,000 | $ 810,700,000
Ryeson Corporation [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Preliminary cash purchase price of acquisition | $ 12,900,000 |  |  |  |  |  |
Cash purchase price of acquisition | $ 12,500,000 |  |  |  |  |  |
Goodwill recorded on a preliminary basis |  |  |  |  | 3,200,000 |  |
Goodwill expected tax deductible amount |  |  |  |  | 0 |  |
Ryeson Corporation [Member] | Trademarks [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Non-amortized trademark |  |  |  |  | 3,700,000 |  |
Car-O-Liner Holding AB [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Preliminary cash purchase price of acquisition |  | $ 151,800,000 |  |  |  |  |
Cash purchase price of acquisition |  | 147,900,000 |  |  |  |  |
Goodwill recorded on a preliminary basis |  | $ 128,100,000 |  |  | 128,100,000 |  |
Goodwill expected tax deductible amount |  |  |  |  | $ 0 |  |
Ecotechnics S.p.A [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash purchase price of acquisition |  |  | $ 11,800,000 |  |  |  |
Pro-Cut International, Inc [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash purchase price of acquisition |  |  |  | $ 41,300,000 |  |  |

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- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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