|
Stock-Based Compensation Expense by Operating Expense (Detail) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
|
| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | |||
| Total stock-based compensation | $ 11,903 | $ 9,237 | $ 15,638 |
| Service Costs | |||
| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | |||
| Total stock-based compensation | 1,382 | 1,180 | 1,869 |
| Sales and Marketing | |||
| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | |||
| Total stock-based compensation | 894 | 645 | 2,029 |
| Product Development | |||
| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | |||
| Total stock-based compensation | 2,595 | 1,635 | 1,038 |
| General and Administrative | |||
| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | |||
| Total stock-based compensation | $ 7,032 | $ 5,777 | $ 10,702 |