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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 | Jun. 28, 2013 | Dec. 31, 2012
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | $ 119,188 | $ 166,392
Total liabilities measured and recorded at fair value | 232 | 143
Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 46,582 | 59,931
Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 72,606 | 106,461
Total liabilities measured and recorded at fair value | 232 | 143
Cash equivalents [Member] | Money market funds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 40,579 | 54,923
Cash equivalents [Member] | U.S. federal government bonds [Member] | Maturity less than 90 days [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets measured and recorded at fair value |  | 3,005
Cash equivalents [Member] | Corporate bonds [Member] | Maturity less than 90 days [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring 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, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 40,579 | 54,923
Cash equivalents [Member] | Level 1 [Member] | U.S. federal government bonds [Member] | Maturity less than 90 days [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets measured and recorded at fair value |  | 3,005
Cash equivalents [Member] | Level 2 [Member] | Corporate bonds [Member] | Maturity less than 90 days [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring 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, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 6,003 | 2,003
Short-term investments [Member] | Certificates of deposit [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 1,607 | 1,603
Short-term investments [Member] | State, municipal and local government agencies bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 41,597 | 59,050
Short-term investments [Member] | Corporate bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 25,425 | 31,562
Short-term investments [Member] | Commercial paper [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 3,846 | 10,288
Short-term investments [Member] | Level 1 [Member] | U.S. federal government bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 6,003 | 2,003
Short-term investments [Member] | Level 2 [Member] | Certificates of deposit [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 1,607 | 1,603
Short-term investments [Member] | Level 2 [Member] | State, municipal and local government agencies bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 41,597 | 59,050
Short-term investments [Member] | Level 2 [Member] | Corporate bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 25,425 | 31,562
Short-term investments [Member] | Level 2 [Member] | Commercial paper [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 3,846 | 10,288
Prepaids and other current assets [Member] | Foreign exchange forward contracts [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 131 | 344
Prepaids and other current assets [Member] | Level 2 [Member] | Foreign exchange forward contracts [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 131 | 344
Accrued liabilities [Member] | Foreign exchange forward contracts [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total liabilities measured and recorded at fair value | 232 | 143
Accrued liabilities [Member] | Level 2 [Member] | Foreign exchange forward contracts [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total liabilities measured and recorded at fair value | $ 232 | $ 143

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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