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Financial instruments - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 25, 2016 | Sep. 27, 2015 | Sep. 25, 2016 | Sep. 27, 2015 | Dec. 31, 2015
Derivatives Fair Value [Line Items] |  |  |  |  |
Allowance for doubtful accounts receivable | $ 9,000,000 |  | $ 9,000,000 |  | $ 8,000,000
Current portion of allowance for doubtful accounts | 2,100,000 |  | 2,100,000 |  | 2,000,000
Noncurrent portion of allowance for doubtful accounts | 6,900,000 |  | 6,900,000 |  | 6,000,000
Net revenues | 455,648,000 | $ 443,714,000 | 1,354,094,000 | $ 1,325,189,000 |
Spain, Italy, Portugal, and Greece |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Allowance for doubtful accounts receivable | 8,000,000 |  | 8,000,000 |  | 7,200,000
Net revenues |  |  | 95,800,000 | 94,400,000 |
Cash flow hedging |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Ineffectiveness related to derivatives | 0 | $ 0 | $ 0 | $ 0 |
Designated as Hedging Instrument | Cash flow hedging | Foreign Currency Contract |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative duration |  |  | 9 months |  |
Forward Contracts | Designated as Hedging Instrument | Cash flow hedging | Foreign Currency Contract |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Total notional amount for all open foreign currency forward contracts | 100,100,000 |  | $ 100,100,000 |  | 49,500,000
Forward Contracts | Not Designated as Hedging Instrument | Foreign Currency Contract |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Loss related to currency forward contracts | 100,000 |  | 1,700,000 |  |
Total notional amount for all open foreign currency forward contracts | $ 77,400,000 |  | $ 77,400,000 |  | $ 69,100,000

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5074-111524 + Details
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- Definition A valuation allowance for receivables due to an Entity for more than one year from the balance sheet date that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 + Details
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