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Property and Equipment - Components of Property and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property Plant And Equipment [Line Items]    
Total $ 38,862 $ 36,638
Less: Accumulated depreciation (10,829) (8,527)
Property and equipment, net 32,866 32,162
Land [Member]    
Property Plant And Equipment [Line Items]    
Total 4,489 4,489
Building [Member]    
Property Plant And Equipment [Line Items]    
Total 17,644 17,633
Computers [Member]    
Property Plant And Equipment [Line Items]    
Total 5,589 5,577
Furniture [Member]    
Property Plant And Equipment [Line Items]    
Total 1,637 1,381
Automobiles and Other Vehicles [Member]    
Property Plant And Equipment [Line Items]    
Total 6,857 5,523
Software [Member]    
Property Plant And Equipment [Line Items]    
Total 2,646 2,035
Net of Accumulated Depreciation [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, net 28,033 28,111
Construction in progress [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, net $ 4,833 $ 4,051