Annual report pursuant to Section 13 and 15(d)

Acquisitions, Goodwill and Other Intangible Assets - Summary of Goodwill and Intangible Assets (Detail)

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Acquisitions, Goodwill and Other Intangible Assets - Summary of Goodwill and Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]      
Goodwill, gross carrying amount $ 11,459 $ 0  
Intangible assets, gross carrying amount 4,240 0  
Goodwill and intangible assets, gross carrying amount, total 15,699 0  
Intangible assets, accumulated amortization (314) 0  
Goodwill, net book value 11,459 0  
Intangible assets, net book value 3,926 0 $ 0
Goodwill and intangible assets, net book value $ 15,385 $ 0