Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Other Intangible Assets - Summary of Net Change in Carrying Value of Intangible Assets (Detail)

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Goodwill and Other Intangible Assets - Summary of Net Change in Carrying Value of Intangible Assets (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Finite-Lived Intangible Assets, Net [Abstract]    
Beginning balance $ 11,459 $ 0
Additions from acquisitions 0 4,186
Impairment losses 0 0
Ending balance $ 11,459 $ 4,186