Stock-Based Compensation (Detail) - Stock-Based Compensation Expense Recognized In Consolidated Statements Of Operations (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 7,400	[1]	$ 0	[1]	$ 27,049	[1]	$ 28,021	[1]
Cost of services and product development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	3,200		0		12,000		12,000
Selling, general and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 4,200		$ 0		$ 15,000		$ 16,000

[1] Includes charges of $1.8 million and $1.5 million for the three months ended September 30, 2013 and 2012, respectively, for awards to retirement-eligible employees since these awards vest on an accelerated basis. The nine months ended September 30, 2013 and 2012 include retirement-eligible charges of $10.6 million and $4.7 million, respectively.