Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Finite Lived Intangible Assets [Line Items]
Trade name	$ 5,871	$ 5,871
Customer relationships	10,644	9,849
Non-compete agreements	194
Intangible Assets, gross	16,709	15,720
Less accumulated amortization	(9,155)	(8,466)
Intangible Assets, net	$ 7,554	$ 7,254
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Estimated useful life in years	11 years
Non-compete Agreements [Member]
Finite Lived Intangible Assets [Line Items]
Estimated useful life in years	5 years