Financial instruments - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 27, 2015	Jun. 28, 2015	Mar. 29, 2015	Dec. 31, 2014	Sep. 28, 2014	Jun. 29, 2014	Mar. 30, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivatives Fair Value [Line Items]
Allowance for doubtful accounts	$ 8,000				$ 8,800				$ 8,000	$ 8,800
Current portion of allowance for doubtful accounts	2,000				2,400				2,000	2,400
Noncurrent portion of allowance for doubtful accounts	6,000				6,400				6,000	6,400
Net revenues	484,501	$ 443,714	$ 452,045	$ 429,430	476,008	$ 457,173	$ 468,105	$ 438,546	1,809,690	1,839,832	$ 1,696,271
Spain, Italy, Portugal, and Greece
Derivatives Fair Value [Line Items]
Current portion of allowance for doubtful accounts	7,200				8,100				7,200	8,100
Long-term portion of accounts receivable net	8,100				11,300				8,100	11,300
Net revenues									126,200	150,500	$ 142,600
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	49,500				$ 0				49,500	$ 0
Not Designated as Hedging Instrument | Foreign Currency Exchange Contracts
Derivatives Fair Value [Line Items]
Total notional amount for all open foreign currency forward contracts	$ 69,100								69,100
Loss on derivative									$ 1,500
Maximum | Designated as Hedging Instrument | Foreign Currency Exchange Contracts | Cash Flow Hedging
Derivatives Fair Value [Line Items]
Duration of foreign currency forward contracts									6 months