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Goodwill and Other Intangible Assets, Net - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]            
Additional goodwill recognized       $ 27,984,000   $ 40,157,000
Measurement period adjustments       (180,000)   $ (2,368,000)
Impairment of goodwill   $ 0        
Intangible amortization expense $ 1,300,000   $ 1,300,000 $ 2,600,000 $ 2,800,000