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Financial Instruments and Derivatives - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended |  | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Sep. 28, 2014 | Sep. 29, 2013 | Sep. 28, 2014 | Sep. 29, 2013 | Dec. 31, 2013 | Sep. 28, 2014 Foreign Currency Forward Contracts | Dec. 31, 2013 Foreign Currency Forward Contracts | Oct. 25, 2013 ZTEC Instruments, Inc.
Financial Instruments and Fair Value [Line Items] |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  |  | $ 2,200,000
Contingent consideration, maximum |  |  |  |  |  |  |  | 5,000,000
Contingent consideration discount rate |  |  | 5.20% |  |  |  |  |
Changes to fair value of contingent consideration | 630,000 |  | 630,000 |  |  |  |  |
Fair market value of investments with unrealized losses | 212,156,000 |  | 212,156,000 |  | 241,760,000 |  |  |
Fair market value of investments with unrealized losses greater than one year | 5,000,000 |  | 5,000,000 |  | 900,000 |  |  |
Fair market value of investments with unrealized losses less than one year | 207,200,000 |  | 207,200,000 |  | 240,900,000 |  |  |
Notional amount of foreign currency forward contracts |  |  |  |  |  | 67,900,000 | 74,800,000 |
Gains (losses) on foreign currency transactions | (400,000) | (400,000) | 900,000 | (5,000,000) |  | (600,000) | 200,000 |
Offsetting foreign exchange contracts | 0 |  | 0 |  | 0 |  |  |
Realized (losses) gains on foreign currency contracts | $ 200,000 | $ 0 | $ (1,600,000) | $ 4,100,000 |  |  |  |

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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479 + Details
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