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, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 7,200	[1]	$ 0	[1]	$ 19,574	[1]	$ 18,802	[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		8,800		8,600
Selling, general and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 4,000		$ 0		$ 10,800		$ 10,200

[1] Includes charges of $1.7 million and $0.2 million for the three months ended June 30, 2013 and 2012, respectively, for awards to retirement-eligible employees since these awards vest on an accelerated basis. The six months ended June 30, 2013 and 2012 include retirement-eligible charges of $8.8 million and $3.2 million, respectively.