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Segment Information - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Segment
Dec. 31, 2011
Dec. 31, 2010
Segment Reporting Information [Line Items]                      
Number of geographic regions considered as reportable operating segments                 3    
Revenues $ 224,095 $ 155,062 $ 149,797 $ 137,625 $ 135,037 $ 112,149 $ 113,366 $ 104,543 $ 666,579 $ 465,095 $ 418,424
BASE24
                      
Segment Reporting Information [Line Items]                      
Percentage of total revenues from licensing BASE24 product line                 32.00% 43.00% 46.00%
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, 2012, 2011 and 2010. No country outside of the United States accounted for more than 10% of the Company's consolidated revenues during the years ended December 31, 2012, 2011 and 2010. No country outside of the United States accounted for more than 10% of the Company's consolidated revenues during the years ended December 31, 2012, 2011 and 2010.
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, 2012, 2011 and 2010. No single customer accounted for more than 10% of the Company’s consolidated revenues during the years ended December 31, 2012, 2011 and 2010. No single customer accounted for more than 10% of the Company’s consolidated revenues during the years ended December 31, 2012, 2011 and 2010.
Americas - United States
                      
Segment Reporting Information [Line Items]                      
Revenues                 $ 277,800 $ 188,000 $ 163,100