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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 | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |  |
Total assets measured and recorded at fair value | $ 131,462 |  | $ 166,392 |
Total liabilities measured and recorded at fair value | 195 |  | 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 | 51,014 |  | 54,923 |
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] | 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 |  |  | 3,005 |
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 | 33,496 |  | 31,562 |
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 | 4,008 |  | 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 |  |  | 1,603 |
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 | 40,449 |  | 59,050 |
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 | 2,299 |  | 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 | 196 | [1] | 344 | [1]
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 | 195 | [1] | 143 | [1]
Level 1 [Member] |  |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |  |
Total assets measured and recorded at fair value | 55,022 |  | 59,931 |
Total liabilities measured and recorded at fair value | 0 |  | 0 |
Level 1 [Member] | 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 | 51,014 |  | 54,923 |
Level 1 [Member] | 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 |  |  | 0 |
Level 1 [Member] | 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 |  |  | 3,005 |
Level 1 [Member] | 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 | 0 |  | 0 |
Level 1 [Member] | 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 | 4,008 |  | 2,003 |
Level 1 [Member] | 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 |  |  | 0 |
Level 1 [Member] | 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 | 0 |  | 0 |
Level 1 [Member] | 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 | 0 |  | 0 |
Level 1 [Member] | 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 | 0 | [1] | 0 | [1]
Level 1 [Member] | 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 | 0 | [1] | 0 | [1]
Level 2 [Member] |  |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |  |
Total assets measured and recorded at fair value | 76,440 |  | 106,461 |
Total liabilities measured and recorded at fair value | 195 |  | 143 |
Level 2 [Member] | 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 | 0 |  | 0 |
Level 2 [Member] | 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 |
Level 2 [Member] | 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 |  |  | 0 |
Level 2 [Member] | 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 | 33,496 |  | 31,562 |
Level 2 [Member] | 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 | 0 |  | 0 |
Level 2 [Member] | 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 |  |  | 1,603 |
Level 2 [Member] | 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 | 40,449 |  | 59,050 |
Level 2 [Member] | 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 | 2,299 |  | 10,288 |
Level 2 [Member] | 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 | 196 | [1] | 344 | [1]
Level 2 [Member] | 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 | 195 | [1] | 143 | [1]
Level 3 [Member] |  |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |  |
Total assets measured and recorded at fair value | 0 |  | 0 |
Total liabilities measured and recorded at fair value | 0 |  | 0 |
Level 3 [Member] | 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 | 0 |  | 0 |
Level 3 [Member] | 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 |  |  | 0 |
Level 3 [Member] | 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 |  |  | 0 |
Level 3 [Member] | 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 | 0 |  | 0 |
Level 3 [Member] | 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 | 0 |  | 0 |
Level 3 [Member] | 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 |  |  | 0 |
Level 3 [Member] | 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 | 0 |  | 0 |
Level 3 [Member] | 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 | 0 |  | 0 |
Level 3 [Member] | 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 | 0 | [1] | 0 | [1]
Level 3 [Member] | 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 | $ 0 | [1] | $ 0 | [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.

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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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