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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 12 Months Ended | 1 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Furniture and fixtures [Member] | Dec. 31, 2013 Internal Use Software [Member] | Dec. 31, 2013 Machinery and equipment [Member] | Dec. 31, 2013 Leasehold Improvements [Member] | Dec. 31, 2013 Forward Contracts [Member] Minimum [Member] | Dec. 31, 2013 Forward Contracts [Member] Maximum [Member] | Dec. 31, 2013 Software [Member] | Dec. 31, 2013 Software Development [Member] | Dec. 31, 2012 Software Development [Member] | Dec. 31, 2011 Software Development [Member] | Dec. 31, 2013 Accounts Receivable [Member] Customer | Dec. 31, 2012 Accounts Receivable [Member] Customer | Dec. 31, 2013 Customer Concentration Risk [Member] Net Revenue [Member] Comcast [Member] | Dec. 31, 2012 Customer Concentration Risk [Member] Net Revenue [Member] Comcast [Member] | Dec. 31, 2011 Customer Concentration Risk [Member] Net Revenue [Member] Comcast [Member] | Mar. 05, 2013 HFC business [Member]
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from sale of cable access HFC business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 46,000,000
Recorded remeasurement losses for foreign currency exchange rate | 500,000 | 700,000 | 700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forward exchange contracts maturity term description | These derivative instruments generally have maturities between one to three months. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative contract term |  |  |  |  |  |  |  | 1 month | 3 months |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents maximum maturity | 3 months | 3 months | 3 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities, maturity term | 24 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Entity-wide revenue, major customer, accounts receivable percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% | 10.00% | 12.00% | 11.00% | 10.00% |
Number of significant customers for accounts receivable |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |
Revenue recognition period, associated with service and maintenance agreement | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of revenue recognized upon completion contract method | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment estimated useful life |  |  |  | 5 years | 3 years | 4 years | 10 years |  |  | 3 years |  |  |  |  |  |  |  |  |
Internal use software development cost capitalized |  |  |  |  |  |  |  |  |  |  | 1,400,000 | 800,000 | 1,100,000 |  |  |  |  |  |
Property, plant and equipment leasehold improvements useful lives |  |  |  |  |  |  | shorter of the remaining useful lives of the assets, up to ten years, or the lease term of the respective assets |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, impairment loss | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Advertising expense | $ 400,000 | $ 500,000 | $ 800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
More Likely Than Not Threshold Recognition of Uncertain Tax Position | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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