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Goodwill and Other Assets (Narrative) (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Goodwill And Other Intangible Assets [Line Items]      
Goodwill $ 2,165,672,000 $ 1,746,762,000  
Change in goodwill carrying amount 418,900,000 145,400,000  
Goodwill deductible for tax purpose 73,200,000    
Other intangible assets gross carrying amounts 144,800,000 96,600,000  
Accumulated amortization 46,300,000 31,300,000  
Amortization expense related to other intangible assets 15,000,000 10,300,000 8,500,000
Amortization expense on other intangible assets, 2013 21,000,000    
Amortization expense on other intangible assets, 2014 18,700,000    
Amortization expense on other intangible assets, 2015 15,500,000    
Amortization expense on other intangible assets, 2016 11,400,000    
Amortization expense on other intangible assets, 2017 6,900,000    
Remaining weighted average amortization period of other intangible assets, in years 1 year 10 months 24 days    
Weighted average amortization period includes amortization expense related to years beyond 2017 25,000,000    
Other assets $ 19,787,000 $ 17,828,000