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Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value Based on Three-Tier Fair Value Hierarchy (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 29, 2013 | Dec. 31, 2012
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Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | $ 174,897 | $ 166,392
Total liabilities measured and recorded at fair value | 63 | 143
Level 1 [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 72,375 | 59,931
Level 2 [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 102,522 | 106,461
Total liabilities measured and recorded at fair value | 63 | 143
Cash equivalents [Member] | Money market funds [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 62,370 | 54,923
Cash equivalents [Member] | U.S. federal government bonds [Member] | Maturity less than 90 days [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 2,002 | 3,005
Cash equivalents [Member] | Corporate bonds [Member] | Maturity less than 90 days [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total assets measured and recorded at fair value |  | 3,614
Cash equivalents [Member] | Level 1 [Member] | Money market funds [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 62,370 | 54,923
Cash equivalents [Member] | Level 1 [Member] | U.S. federal government bonds [Member] | Maturity less than 90 days [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 2,002 | 3,005
Cash equivalents [Member] | Level 2 [Member] | Corporate bonds [Member] | Maturity less than 90 days [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total assets measured and recorded at fair value |  | 3,614
Short-term investments [Member] | U.S. federal government bonds [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 8,003 | 2,003
Short-term investments [Member] | Certificates of deposit [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 1,605 | 1,603
Short-term investments [Member] | State, municipal and local government agencies bonds [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 59,191 | 59,050
Short-term investments [Member] | Corporate bonds [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 31,047 | 31,562
Short-term investments [Member] | Commercial paper [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 9,944 | 10,288
Short-term investments [Member] | Level 1 [Member] | U.S. federal government bonds [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 8,003 | 2,003
Short-term investments [Member] | Level 2 [Member] | Certificates of deposit [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 1,605 | 1,603
Short-term investments [Member] | Level 2 [Member] | State, municipal and local government agencies bonds [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 59,191 | 59,050
Short-term investments [Member] | Level 2 [Member] | Corporate bonds [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 31,047 | 31,562
Short-term investments [Member] | Level 2 [Member] | Commercial paper [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 9,944 | 10,288
Prepaids and other current assets [Member] | Foreign exchange forward contracts [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 735 | 344
Prepaids and other current assets [Member] | Level 2 [Member] | Foreign exchange forward contracts [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 735 | 344
Accrued liabilities [Member] | Foreign exchange forward contracts [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total liabilities measured and recorded at fair value | 63 | 143
Accrued liabilities [Member] | Level 2 [Member] | Foreign exchange forward contracts [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total liabilities measured and recorded at fair value | $ 63 | $ 143

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