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Property and Equipment - Components of Property and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Less: Accumulated depreciation and amortization $ (20,043) $ (17,074)
Property and equipment, net 53,572 41,351
Land [Member]    
Property, Plant and Equipment [Line Items]    
Total 5,344 5,344
Building [Member]    
Property, Plant and Equipment [Line Items]    
Total 24,091 24,091
Computers [Member]    
Property, Plant and Equipment [Line Items]    
Total 9,186 7,885
Furniture [Member]    
Property, Plant and Equipment [Line Items]    
Total 2,012 2,002
Automobiles and other vehicles [Member]    
Property, Plant and Equipment [Line Items]    
Total 11,544 9,481
Software [Member]    
Property, Plant and Equipment [Line Items]    
Total 7,166 2,835
Net of accumulated depreciation [Member]    
Property, Plant and Equipment [Line Items]    
Total 59,343 51,638
Property and equipment, net 39,300 34,564
Construction in progress [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, net $ 14,272 $ 6,787