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Property and Equipment - Schedule of Property and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property Plant And Equipment Gross $ 223,055 $ 191,043
Less: accumulated depreciation and amortization (132,938) (109,968)
Property Plant And Equipment Net 90,117 81,075
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property Plant And Equipment Gross   66
Building [Member]    
Property, Plant and Equipment [Line Items]    
Property Plant And Equipment Gross   218
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property Plant And Equipment Gross 6,717 6,152
Furniture, Fixtures and Equipment[Member]    
Property, Plant and Equipment [Line Items]    
Property Plant And Equipment Gross 38,369 30,863
Vehicles and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property Plant And Equipment Gross $ 177,969 $ 153,744