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Goodwill And Intangible Assets - (Narrative) (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Goodwill And Intangible Assets [Line Items]          
Goodwill $ 1,708,585   $ 1,708,585   $ 1,708,585
Amortization expense 15,959 16,422 47,877 49,537  
Performance And Risk Segment [Member]
         
Goodwill And Intangible Assets [Line Items]          
Goodwill 1,477,500   1,477,500    
Governance Segment [Member]
         
Goodwill And Intangible Assets [Line Items]          
Goodwill $ 231,100   $ 231,100