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Commitments and contingent liabilities - Additional Information (Detail) (USD $) In Millions, unless otherwise specified |  |  | 9 Months Ended |  |  |  |  |  | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 28, 2014 | Dec. 31, 2013 | Sep. 28, 2014 Minimum | Sep. 28, 2014 Maximum | Sep. 28, 2014 Accrued Liabilities | Dec. 31, 2013 Accrued Liabilities | Sep. 28, 2014 Other Liability | Dec. 31, 2013 Other Liability | Sep. 28, 2014 Property, Plant and Equipment | Sep. 28, 2014 Property, Plant and Equipment Build To Suit Lease
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Estimated fair value of the costs to construct buildings |  |  |  |  |  |  |  |  | $ 28.2 | $ 28.3
Lease commencement date |  |  |  |  |  |  |  |  |  | Sep. 01, 2013
Waste disposed accrued liability |  |  |  |  | 2.2 | 2.5 | 5.3 | 5.8 |  |
Time-frame over which the accrued amounts may be paid out, in years |  |  | 15 years | 20 years |  |  |  |  |  |
Contingency reserve for litigation | $ 4.2 | $ 6.8 |  |  |  |  |  |  |  |
Expected construction completion year |  |  |  |  |  |  |  |  |  | 2014-10

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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 + Details
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- Definition Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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