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Segment Information - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 135,037 | $ 112,149 | $ 113,366 | $ 104,543 | $ 141,241 | $ 97,017 | $ 92,423 | $ 87,743 | $ 465,095 | $ 418,424 | $ 405,755
Geographic Concentration Risk |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of revenues |  |  |  |  |  |  |  |  | No country outside of the United States accounted for more than 10% of the Company’s consolidated revenues during the years ended December 31, 2011, 2010 and 2009. | No country outside of the United States accounted for more than 10% of the Company’s consolidated revenues during the years ended December 31, 2011, 2010 and 2009. | No country outside of the United States accounted for more than 10% of the Company’s consolidated revenues during the years ended December 31, 2011, 2010 and 2009.
Customer Concentration Risk |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of revenues |  |  |  |  |  |  |  |  | No single customer accounted for more than 10% of the Company's consolidated revenues during the years ended December 31, 2011. | No single customer accounted for more than 10% of the Company's consolidated revenues during the years ended December 31, 2010. | No single customer accounted for more than 10% of the Company's consolidated revenues during the years ended December 31, 2009.
Americas - United States |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 188,000 | $ 163,100 | $ 172,700
BASE24 |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of total revenues from licensing BASE24 product line |  |  |  |  |  |  |  |  | 43.00% | 46.00% | 46.00%

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- Definition Percentage of total revenues derived from licensing the BASE24 product line, which does not include the BASE24-eps product, and providing related services and maintenance. + References No definition available. + Details
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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 1 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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- Definition Disclosure of the extent of enterprise reliance on its major customers. For example, includes revenues from transactions with a single external customer amounting to 10 percent or more of the entity's revenues, the total amount of revenues from each such customer, and the identity of the segment or segments reporting the revenues. A group of entities that the entity knows to be under common control generally will be considered a single customer for inclusion in this item. The federal government, a state government, a local government (for example, a county or municipality), or a foreign government each will generally be considered as a single customer for inclusion in this item. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 39 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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