XML 86 R71.htm IDEA: XBRL DOCUMENT v3.20.4
Detail of Certain Balance Sheet Accounts - Property and Equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Finance lease assets and rental purchase options (see Note 9) $ 52,160 $ 14,162
Property and equipment, gross 2,932,788 2,636,851
Less — Accumulated depreciation and amortization (1,372,132) (1,250,197)
Property and equipment, net of accumulated depreciation 1,560,656 1,386,654
Land    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 69,389 67,560
Buildings and leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 249,106 $ 231,920
Buildings and leasehold improvements | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated useful lives 5 years 5 years
Buildings and leasehold improvements | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated useful lives 30 years 30 years
Operating equipment and vehicles    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 2,297,120 $ 2,068,644
Operating equipment and vehicles | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated useful lives 1 year 1 year
Operating equipment and vehicles | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated useful lives 25 years 25 years
Office equipment, furniture and fixtures and information technology systems    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 244,113 $ 228,329
Office equipment, furniture and fixtures and information technology systems | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated useful lives 3 years 3 years
Office equipment, furniture and fixtures and information technology systems | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated useful lives 10 years 10 years
Construction work in progress    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 20,900 $ 26,236
Finance lease assets and rental purchase options | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated useful lives 5 years 5 years
Finance lease assets and rental purchase options | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated useful lives 20 years 20 years