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Financial instruments - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Oct. 01, 2017 | Jul. 02, 2017 | Apr. 02, 2017 | Dec. 31, 2016 | Sep. 25, 2016 | Jun. 26, 2016 | Mar. 27, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Derivatives Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ineffectiveness on hedging derivatives |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0
Allowance for doubtful accounts | $ 10,300 |  |  |  | $ 8,600 |  |  |  | 10,300 | 8,600 |
Current portion of allowance for doubtful accounts | 3,500 |  |  |  | 2,000 |  |  |  | 3,500 | 2,000 |
Noncurrent portion of allowance for doubtful accounts | 6,800 |  |  |  | 6,600 |  |  |  | 6,800 | 6,600 |
Net revenues | 595,106 | $ 534,703 | $ 528,613 | $ 487,881 | 513,933 | $ 455,648 | $ 473,553 | $ 424,893 | 2,146,303 | 1,868,027 | 1,809,690
Spain, Italy, Portugal, and Greece |  |  |  |  |  |  |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 129,400 | 125,300 | $ 126,200
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 | 88,500 |  |  |  | 101,800 |  |  |  | 88,500 | 101,800 |
Not Designated as Hedging Instrument | Foreign Currency Exchange Contracts |  |  |  |  |  |  |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss on derivative |  |  |  |  |  |  |  |  | 2,600 | 2,300 |
Total notional amount for all open foreign currency forward contracts | $ 110,600 |  |  |  | $ 73,400 |  |  |  | $ 110,600 | $ 73,400 |

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