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Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]        
Impairment of goodwill   $ 6,500,000 $ 0 $ 0
Amortization expense for intangible assets $ 11,900,000 12,700,000 $ 36,400,000 $ 36,900,000
Contractual fees   5,300,000    
Maintenance expense   $ 1,000,000