Annual report pursuant to Section 13 and 15(d)

Detail of Certain Balance Sheet Accounts - Property and Equipment (Detail)

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Detail of Certain Balance Sheet Accounts - Property and Equipment (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Land $ 41,428 $ 40,657
Buildings and leasehold improvements 116,697 93,042
Operating equipment and vehicles 1,517,630 1,459,409
Office equipment, furniture and fixtures and information technology systems 137,670 119,529
Construction work in progress 43,806 38,496
Property and equipment, Gross 1,857,231 1,751,133
Less - Accumulated depreciation and amortization (755,272) (651,559)
Property and equipment, net $ 1,101,959 $ 1,099,574
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 15 years