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Property and Equipment - Schedule of Property and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 293,080 $ 264,266
Less: accumulated depreciation and amortization (189,058) (157,856)
Property and equipment, net 104,022 106,410
Land    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 108 108
Buildings    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 3,901 3,901
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 10,288 7,748
Furniture, fixtures and equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 55,780 49,199
Vehicles and equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 223,003 $ 203,310