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Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value Based on Three-Tier Fair Value Hierarchy (Detail) (USD $) | Sep. 26, 2014 | Dec. 31, 2013
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | $ 0 |  |  |
Liabilities, Fair Value Disclosure, Nonrecurring | 0 |  |  |
Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets measured and recorded at fair value | 7,393,000 |  | 55,022,000 |
Total liabilities measured and recorded at fair value | 0 |  | 0 |
Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets measured and recorded at fair value | 55,170,000 |  | 76,440,000 |
Total liabilities measured and recorded at fair value | 331,000 |  | 195,000 |
Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets measured and recorded at fair value | 0 |  | 0 |
Total liabilities measured and recorded at fair value | 0 |  | 0 |
Estimate of Fair Value Measurement [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets measured and recorded at fair value | 62,563,000 |  | 131,462,000 |
Total liabilities measured and recorded at fair value | 331,000 |  | 195,000 |
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 | 4,292,000 |  | 51,014,000 |
Cash equivalents [Member] | Level 2 [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 | 0 |  | 0 |
Cash equivalents [Member] | Level 3 [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 | 0 |  | 0 |
Cash equivalents [Member] | Estimate of Fair Value Measurement [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 | 4,292,000 |  | 51,014,000 |
Short-term investments [Member] | Level 1 [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 | 0 |  | 0 |
Short-term investments [Member] | Level 1 [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 | 0 |  | 0 |
Short-term investments [Member] | Level 1 [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 | 0 |  | 0 |
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 |  |  | 4,008,000 |
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 | 25,714,000 |  | 40,449,000 |
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 | 26,138,000 |  | 33,496,000 |
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 | 3,299,000 |  | 2,299,000 |
Short-term investments [Member] | Level 2 [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 | 0 |  | 0 |
Short-term investments [Member] | Level 3 [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 | 0 |  | 0 |
Short-term investments [Member] | Level 3 [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 | 0 |  | 0 |
Short-term investments [Member] | Level 3 [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 | 0 |  | 0 |
Short-term investments [Member] | Level 3 [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 | 0 |  | 0 |
Short-term investments [Member] | Estimate of Fair Value Measurement [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 | 25,714,000 |  | 40,449,000 |
Short-term investments [Member] | Estimate of Fair Value Measurement [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 | 26,138,000 |  | 33,496,000 |
Short-term investments [Member] | Estimate of Fair Value Measurement [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 | 3,299,000 |  | 2,299,000 |
Short-term investments [Member] | Estimate of Fair Value Measurement [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 | 0 |  | 4,008,000 |
Prepaids and other current assets [Member] | Level 1 [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 | 0 | [1] | 0 | [1]
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 | 19,000 | [1] | 196,000 | [1]
Prepaids and other current assets [Member] | Level 3 [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 | 0 | [1] | 0 | [1]
Prepaids and other current assets [Member] | Estimate of Fair Value Measurement [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 | 19,000 | [1] | 196,000 | [1]
Other Long-term Investments [Member] | Equity Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets measured and recorded at fair value | 3,101,000 |  |  |
Other Long-term Investments [Member] | Level 1 [Member] | Equity Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets measured and recorded at fair value | 3,101,000 |  |  |
Accrued Liabilities [Member] | Level 1 [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 | 0 | [1] | 0 | [1]
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 | 331,000 | [1] | 195,000 | [1]
Accrued Liabilities [Member] | Level 3 [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 | 0 | [1] | 0 | [1]
Accrued Liabilities [Member] | Estimate of Fair Value Measurement [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 | $ 331,000 | [1] | $ 195,000 | [1]
[1] | Derivative assets and liabilities represent forward currency exchange contracts. The Company enters into these contracts to minimize the short-term impact of foreign currency exchange rates fluctuations primarily from trade and inter-company receivables and payables.

X
- 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 This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + 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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- Definition Aggregation of the liabilities reported on the balance sheet measured at fair value on a nonrecurring basis by the entity. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant