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Financial instruments - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 27, 2015 | Jun. 28, 2015 | Mar. 29, 2015 | Dec. 31, 2014 | Sep. 28, 2014 | Jun. 29, 2014 | Mar. 30, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Derivatives Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts | $ 8,000 |  |  |  | $ 8,800 |  |  |  | $ 8,000 | $ 8,800 |
Current portion of allowance for doubtful accounts | 2,000 |  |  |  | 2,400 |  |  |  | 2,000 | 2,400 |
Noncurrent portion of allowance for doubtful accounts | 6,000 |  |  |  | 6,400 |  |  |  | 6,000 | 6,400 |
Net revenues | 484,501 | $ 443,714 | $ 452,045 | $ 429,430 | 476,008 | $ 457,173 | $ 468,105 | $ 438,546 | 1,809,690 | 1,839,832 | $ 1,696,271
Spain, Italy, Portugal, and Greece |  |  |  |  |  |  |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Current portion of allowance for doubtful accounts | 7,200 |  |  |  | 8,100 |  |  |  | 7,200 | 8,100 |
Long-term portion of accounts receivable net | 8,100 |  |  |  | 11,300 |  |  |  | 8,100 | 11,300 |
Net revenues |  |  |  |  |  |  |  |  | 126,200 | 150,500 | $ 142,600
Designated as Hedging Instrument | Foreign Currency Exchange Contracts | Cash Flow Hedging |  |  |  |  |  |  |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total notional amount for all open foreign currency forward contracts | 49,500 |  |  |  | $ 0 |  |  |  | 49,500 | $ 0 |
Not Designated as Hedging Instrument | Foreign Currency Exchange Contracts |  |  |  |  |  |  |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total notional amount for all open foreign currency forward contracts | $ 69,100 |  |  |  |  |  |  |  | 69,100 |  |
Loss on derivative |  |  |  |  |  |  |  |  | $ 1,500 |  |
Maximum | Designated as Hedging Instrument | Foreign Currency Exchange Contracts | Cash Flow Hedging |  |  |  |  |  |  |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Duration of foreign currency forward contracts |  |  |  |  |  |  |  |  | 6 months |  |

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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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