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Financial instruments - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 25, 2016 | Jun. 26, 2016 | Mar. 27, 2016 | Dec. 31, 2015 | Sep. 27, 2015 | Jun. 28, 2015 | Mar. 29, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Derivatives Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts | $ 8,600 |  |  |  | $ 8,000 |  |  |  | $ 8,600 | $ 8,000 |
Current portion of allowance for doubtful accounts | 2,000 |  |  |  | 2,000 |  |  |  | 2,000 | 2,000 |
Noncurrent portion of allowance for doubtful accounts | 6,600 |  |  |  | 6,000 |  |  |  | 6,600 | 6,000 |
Net revenues | 513,933 | $ 455,648 | $ 473,553 | $ 424,893 | 484,501 | $ 443,714 | $ 452,045 | $ 429,430 | 1,868,027 | 1,809,690 | $ 1,839,832
Spain, Italy, Portugal, and Greece |  |  |  |  |  |  |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Current portion of allowance for doubtful accounts | 7,700 |  |  |  | 7,200 |  |  |  | 7,700 | 7,200 |
Long-term portion of accounts receivable net | 2,700 |  |  |  | 8,100 |  |  |  | 2,700 | 8,100 |
Net revenues |  |  |  |  |  |  |  |  | 125,300 | 126,200 | $ 150,500
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 | 101,800 |  |  |  | 49,500 |  |  |  | 101,800 | 49,500 |
Not Designated as Hedging Instrument | Foreign Currency Exchange Contracts |  |  |  |  |  |  |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss on derivative |  |  |  |  |  |  |  |  | 2,300 | 1,500 |
Total notional amount for all open foreign currency forward contracts | $ 73,400 |  |  |  | $ 69,100 |  |  |  | $ 73,400 | $ 69,100 |

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