Financial instruments - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Sep. 25, 2016	Oct. 01, 2017	Sep. 25, 2016	Dec. 31, 2016
Derivatives Fair Value [Line Items]
Net revenues	$ 534,703,000	$ 455,648,000	$ 1,551,197,000	$ 1,354,094,000
Spain, Italy, Portugal, and Greece
Derivatives Fair Value [Line Items]
Net revenues			96,000,000	95,800,000
Cash flow hedging
Derivatives Fair Value [Line Items]
Ineffectiveness related to derivatives	0	0	0	0
Foreign exchange contract | Designated as Hedging Instrument | Cash flow hedging
Derivatives Fair Value [Line Items]
Total notional amount for all open foreign currency forward contracts	76,100,000		76,100,000		$ 101,800,000
Foreign exchange contract | Not Designated as Hedging Instrument
Derivatives Fair Value [Line Items]
Loss related to currency forward contracts	600,000	$ 100,000	3,700,000	$ 1,700,000
Total notional amount for all open foreign currency forward contracts	$ 112,300,000		$ 112,300,000		$ 73,400,000