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