Quarterly report pursuant to Section 13 or 15(d)

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

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Goodwill and Other Intangible Assets - Summary of Goodwill and Intangible Assets (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Jan. 01, 2018
Goodwill and Intangible Assets Disclosure [Abstract]        
Goodwill, gross carrying amount $ 11,459 $ 11,459    
Intangible assets, gross carrying amount 4,240 4,240    
Goodwill and intangible assets, gross carrying amount, total 15,699 15,699    
Intangible assets, accumulated amortization (566) (314)    
Goodwill, net book value 11,459 11,459    
Intangible assets, net book value 3,674 3,926 $ 0 $ 0
Goodwill and intangible assets, net book value $ 15,133 $ 15,385