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Detail of Certain Balance Sheet Accounts - Property and Equipment (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Land $ 45,919 $ 41,428
Buildings and leasehold improvements 137,515 116,697
Operating equipment and vehicles 1,634,850 1,517,630
Office equipment, furniture and fixtures and information technology systems 145,174 137,670
Construction work in progress 73,461 43,806
Property and equipment, Gross 2,036,919 1,857,231
Less - Accumulated depreciation and amortization (862,825) (755,272)
Property and equipment, net $ 1,174,094 $ 1,101,959
Minimum [Member] | Buildings and Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment of Estimated Useful Lives in Years 5 years  
Minimum [Member] | Operating Equipment and Vehicles [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment of Estimated Useful Lives in Years 5 years  
Minimum [Member] | Office Equipment, Furniture and Fixtures and Information Technology Systems [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment of Estimated Useful Lives in Years 3 years  
Maximum [Member] | Buildings and Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment of Estimated Useful Lives in Years 30 years  
Maximum [Member] | Operating Equipment and Vehicles [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment of Estimated Useful Lives in Years 25 years  
Maximum [Member] | Office Equipment, Furniture and Fixtures and Information Technology Systems [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment of Estimated Useful Lives in Years 10 years