Stock-Based Compensation (Detail) - Stock-Based Compensation Expense Recognized In Consolidated Statements Of Operations (USD $)	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Total expense (1)	$ 9,200,000	[1]	$ 7,800,000	[1]	$ 28,021,000	[1]	$ 24,750,000	[1]
Retirement Eligible Employees Equity Award [Member]
Total expense (1)	1,500,000		200,000		4,700,000		3,000,000
Cost of Sales [Member]
Stock-based compensation expense	3,500,000		3,300,000		12,000,000		11,300,000
Selling, General and Administrative Expenses [Member]
Stock-based compensation expense	$ 5,700,000		$ 4,500,000		$ 16,000,000		$ 13,500,000

[1] The three months ended September 30, 2012 and 2011 included charges of $1.5 million and $0.2 million, respectively, related to awards to retirement-eligible employees, since awards granted to retirement-eligible employees vest on an accelerated basis. The nine months ended September 30, 2012 and 2011 included charges of $4.7 million and $3.0 million, respectively, for retirement-eligible employees.