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Intangible Assets - Summary of Intangible Assets (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Goodwill And Intangible Assets Disclosure [Abstract]    
Trade name $ 5,700 $ 5,700
Customer relationships 9,611 9,611
Intangible Assets, gross 15,311 15,311
Less accumulated amortization (7,587) (6,716)
Intangible Assets, net $ 7,724 $ 8,595
Estimated useful life in years, Customer relationships 11 years