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Identifiable Intangible Assets from Acquisitions - Summary of Identifiable Intangible Assets from Acquisitions (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 21,478	$ 21,478
Accumulated Amortization	2,349	781
Net	19,129	20,697
Customer Relationships
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	12,368	12,368
Accumulated Amortization	913	295
Net	11,455	12,073
Technologies
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	5,879	5,879
Accumulated Amortization	748	258
Net	5,131	5,621
Non-compete Agreements
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,559	2,559
Accumulated Amortization	560	184
Net	1,999	2,375
Tradenames
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	672	672
Accumulated Amortization	128	44
Net	$ 544	$ 628

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