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Goodwill and Other Intangible Assets, Net - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]      
Additional goodwill recognized $ 0   $ 91,300,000
Intangible amortization expense 8,700,000 $ 6,200,000  
Impairment charges of indefinite life intangibles $ 0 $ 0