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Stock-Based Compensation Expense by Award Type (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share Based Compensation $ 32,865 [1] $ 32,634 [1] $ 26,066 [1]
Retirement Eligible Employees, Equity Award
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share Based Compensation $ 3,100 $ 3,100 $ 1,900
[1] Includes charges of $3.1 million in both 2011 and 2010 and $1.9 million in 2009 for awards to retirement-eligible employees.