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Commitments and Contingencies - Additional Information (Detail) (USD $) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2010 Patents | Dec. 31, 2009 Respondent | Sep. 30, 2009 Respondent | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Commitment And Contingencies [Line Items] |  |  |  |  |  |
Purchase order outstanding |  |  |  | $ 7,156,000 |  |
Total annual rental expense |  |  |  | 5,806,000 | 5,557,000 | 5,190,000
Total annual rental income |  |  |  | $ 854,000 | $ 791,000 | $ 607,000
Number of respondents with whom a settlement was reached |  | 5 | 2 |  |  |
Number of the Company's patents found invalid | 2 |  |  |  |  |

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