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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]      
Goodwill $ 3,366,150 $ 2,776,188  
Change in goodwill carrying amount 590,000 382,500  
Goodwill deductible for tax purpose 83,700    
Change in carrying amount of intangible assets, net 226,100    
Amortization expense for existing other intangible assets $ 42,000 $ 30,100 $ 24,500