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Intangible Assets - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Intangible Assets Net Excluding Goodwill [Abstract]        
Amortization expense $ 1.3 $ 1.0 $ 2.7 $ 1.5