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Summary of Significant Accounting Policies - Schedule of Gross Carrying Values, Accumulated Amortization and Net Carrying Amounts of Major Classes of Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Finite Lived Intangible Assets [Line Items]    
Gross $ 39,900 $ 31,700
Accumulated amortization, intangible assets 6,952 3,320
Net 32,948 28,380
Customer Relationships [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross 39,500 31,000
Accumulated amortization, intangible assets 6,729 2,850
Net 32,771 28,150
Tradenames [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross 200 500
Accumulated amortization, intangible assets 183 450
Net 17 50
Leasehold Interests [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross 200 200
Accumulated amortization, intangible assets 40 20
Net $ 160 $ 180