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Financial instruments - Additional Information (Detail) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jul. 01, 2018 USD ($) | Apr. 01, 2018 USD ($) | Dec. 31, 2017 USD ($) | Oct. 01, 2017 USD ($) | Jul. 02, 2017 USD ($) | Apr. 02, 2017 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Oct. 04, 2018 USD ($) | Oct. 04, 2018 EUR (€)
Derivatives Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation, continuing operations, adjustments, net of tax |  |  |  |  |  |  |  |  | $ (83,889,000) | $ 173,074,000 | $ (69,162,000) |  |
Ineffectiveness on hedging derivatives |  |  |  |  |  |  |  |  | 0 | 0 | 0 |  |
Allowance for doubtful accounts | $ 9,348,000 |  |  |  | $ 10,255,000 |  |  |  | 9,348,000 | 10,255,000 |  |  |
Current portion of allowance for doubtful accounts | 4,400,000 |  |  |  | 3,500,000 |  |  |  | 4,400,000 | 3,500,000 |  |  |
Net revenues | 641,615,000 | $ 609,672,000 | $ 609,866,000 | $ 587,230,000 | 595,106,000 | $ 534,703,000 | $ 528,613,000 | $ 487,881,000 | 2,448,383,000 | 2,146,303,000 | 1,868,027,000 |  |
Spain, Italy, Portugal, and Greece |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 142,700,000 | 129,400,000 | $ 125,300,000 |  |
Cross Currency Interest Rate Contract | Cash Flow Hedging |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation, continuing operations, adjustments, net of tax |  |  |  |  |  |  |  |  | 4,000,000 |  |  |  |
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 | 115,300,000 |  |  |  | 88,500,000 |  |  |  | 115,300,000 | 88,500,000 |  |  |
Designated as Hedging Instrument | Cross Currency Interest Rate Contract |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total notional amount for all open foreign currency forward contracts |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 | € 433,900,000.0
Derivative, number of instruments held |  |  |  |  |  |  |  |  |  |  |  | 6 | 6
Derivative, fixed interest rate |  |  |  |  |  |  |  |  |  |  |  | 4.625% | 4.625%
Derivative, annual interest rate |  |  |  |  |  |  |  |  |  |  |  | 1.942% | 1.942%
Not Designated as Hedging Instrument | Foreign Currency Exchange Contracts |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on derivative |  |  |  |  |  |  |  |  | 1,900,000 | 2,600,000 |  |  |
Total notional amount for all open foreign currency forward contracts | $ 125,900,000 |  |  |  | $ 110,600,000 |  |  |  | $ 125,900,000 | $ 110,600,000 |  |  |

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