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Stock-based Compensation Expense by Operating Expense (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total stock-based compensation $ 2,365 $ 3,702 $ 6,875 $ 12,395
Income tax benefit related to stock-based compensation included in net income (loss) 686 1,088 1,937 3,750
Service Costs
        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total stock-based compensation 455 554 818 1,545
Sales and Marketing
        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total stock-based compensation 211 153 474 2,008
Product Development
        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total stock-based compensation 361 203 1,127 860
General and Administrative
        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total stock-based compensation $ 1,338 $ 2,792 $ 4,456 $ 7,982