Stock-Based Compensation (Detail) - Stock-Based Compensation Expense Recognized In Consolidated Statements Of Operations (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 6,900	[1],[2]	$ 7,200	[1],[2]	$ 20,600	[1],[2]	$ 19,574	[1],[2]
Cost of services and product development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	3,700		3,200		9,500		8,800
Selling, general and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 3,200		$ 4,000		$ 11,100		$ 10,800

[1] The three and six months ended June 30, 2014 include a reversal of $1.9 million of expense from forfeited awards related to the departure of the Company's former CFO.

[2] Includes charges of $2.1 million and $1.7 million for the three months ended June 30, 2014 and 2013, respectively, and $9.8 million and $8.8 million for the six months ended June 30, 2014 and 2013, respectively, for awards to retirement-eligible employees since these awards vest on an accelerated basis.