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Goodwill and Other Intangibles - Schedule of Identifiable Intangibles (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
Nonamortizable identifiable intangibles $ 0 $ 458,589
Identifiable intangibles (net of amortization of $168.8 and $153.7 million at December 31, 2017 and 2016, respectively) 639,203 201,859
Total identifiable intangibles 639,203 660,448
Accumulated amortization of identifiable intangibles $ 168,800 $ 153,700