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Financial Instruments and Derivatives - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended |  |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jun. 29, 2014 | Jun. 30, 2013 | Jun. 29, 2014 | Jun. 30, 2013 | Dec. 31, 2013 | Oct. 25, 2013 ZTEC Instruments, Inc. | Oct. 25, 2013 ZTEC Instruments, Inc. Maximum | Jun. 29, 2014 Foreign Currency Forward Contracts | Dec. 31, 2013 Foreign Currency Forward Contracts
Financial Instruments and Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Available-for-sale securities, realized gain | $ 400,000 | $ 100,000 | $ 700,000 | $ 300,000 |  |  |  |  |
Available-for-sale securities, realized losses | 0 | 0 | 0 | 0 |  |  |  |  |
Contingent consideration |  |  |  |  |  | 2,200,000 | 5,000,000 |  |
Contingent consideration discount rate |  |  | 5.20% |  |  |  |  |  |
Changes to fair value of contingent consideration |  |  | 0 |  |  |  |  |  |
Fair market value of investments with unrealized losses | 104,322,000 |  | 104,322,000 |  | 241,760,000 |  |  |  |
Fair market value of investments with unrealized losses greater than one year | 6,900,000 |  | 6,900,000 |  | 900,000 |  |  |  |
Fair market value of investments with unrealized losses less than one year | 97,400,000 |  | 97,400,000 |  | 240,900,000 |  |  |  |
Notional amount of foreign currency forward contracts |  |  |  |  |  |  |  | 69,400,000 | 74,800,000
Gains (losses) on foreign currency transactions | 700,000 | (1,800,000) | 1,300,000 | (4,600,000) |  |  |  | (300,000) | 200,000
Offsetting foreign exchange contracts | 0 |  | 0 |  | 0 |  |  |  |
Realized (losses) gains on foreign currency contracts | $ (1,100,000) | $ 1,800,000 | $ (1,900,000) | $ 4,100,000 |  |  |  |  |

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