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Goodwill and Other Asset - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Goodwill And Intangible Assets Disclosure [Abstract]      
Goodwill $ 2,393,731,000 $ 2,165,672,000  
Change in goodwill carrying amount 228,100,000 418,900,000  
Goodwill deductible for tax purpose 111,000,000    
Other intangible assets gross carrying amounts 174,400,000 144,800,000  
Accumulated amortization 70,800,000 46,300,000  
Amortization expense related to other intangible assets 24,500,000 15,000,000 10,300,000
Amortization expense on other intangible assets, 2014 25,400,000    
Amortization expense on other intangible assets, 2015 20,800,000    
Amortization expense on other intangible assets, 2016 15,500,000    
Amortization expense on other intangible assets, 2017 9,500,000    
Amortization expense on other intangible assets, 2018 8,600,000    
Remaining weighted average amortization period of other intangible assets, in years 1 year 7 months 6 days    
Weighted average amortization period includes amortization expense related to years beyond 2018 23,800,000    
Other assets $ 25,799,000 $ 19,787,000