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Property and Equipment
 12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Property and Equipment
7.PROPERTY AND EQUIPMENT
Property and equipment are summarized as follows:
 As of December 31,
 20212020
Construction and transportation equipment$315,756 $231,799 
Buildings and improvements24,098 21,025 
Land3,891 3,891 
Office equipment3,839 3,012 
Total property and equipment347,584 259,727 
Less accumulated depreciation(143,268)(133,059)
Total property and equipment, net$204,316 $126,668 
Depreciation Expense—Depreciation expense is primarily included within cost of revenues and was $22,737, $21,349 and $16,045 for 2021, 2020 and 2019, respectively.