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