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Financial instruments - additional information (Detail) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 28, 2014 | Sep. 29, 2013 | Sep. 28, 2014 | Sep. 29, 2013 | Dec. 31, 2013
Derivatives Fair Value [Line Items] |  |  |  |  |
Total notional amount for all open foreign currency forward contracts | $ 20,500,000 |  | $ 20,500,000 |  | $ 0
Amount of gains in accumulated other comprehensive income to be reclassified as expense to the statement of income | 200,000 |  | 200,000 |  |
Allowance for doubtful accounts | 10,400,000 |  | 10,400,000 |  | 10,700,000
Net revenues | 457,173,000 | 413,796,000 | 1,363,824,000 | 1,245,732,000 |
Spain, Italy, Portugal, and Greece |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Net revenues |  |  | $ 114,800,000 | $ 106,300,000 |

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- Definition The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7668309&loc=d3e80748-113994 + Details
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