Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Additional Information (Detail)

v2.4.0.8
Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2013
Customer
Entity
Jun. 30, 2012
Customer
Jun. 30, 2013
Customer
Entity
Jun. 30, 2012
Customer
Jun. 30, 2013
Sales
Jun. 30, 2012
Sales
Jun. 30, 2013
Sales
Jun. 30, 2012
Sales
Jun. 30, 2013
North America
Dec. 31, 2012
North America
Jun. 30, 2013
International Subsidiaries
Dec. 31, 2012
International Subsidiaries
Schedule Of Significant Accounting Policies [Line Items]                        
Net long-lived assets                 $ 39.9 $ 29.9 $ 2.7 $ 2.6
Primary sources of revenue 3   3                  
Revenue recognition access period 4 years   4 years                  
Renewal of additional term license 1 year   1 year                  
Customers contribution to revenue         5.00% 5.00% 5.00% 5.00%        
Number of customer accounted for 5% or more of revenue 0 0 0 0