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Goodwill and Other Intangibles - Schedule of Identifiable Intangibles (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]    
Nonamortizable identifiable intangibles $ 488,144 $ 498,517
Identifiable intangibles (net of amortization of $131.5 and $103.6 million at December 31, 2015 and 2014, respectively) 212,161 240,227
Total identifiable intangibles 700,305 738,744
Accumulated amortization of identifiable intangibles $ 131,500 $ 103,600