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Detail of Certain Balance Sheet Accounts - Property and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Minimum [Member]
Buildings and leasehold improvements [Member]
Dec. 31, 2013
Minimum [Member]
Operating equipment and vehicles [Member]
Dec. 31, 2013
Minimum [Member]
Fiber optic and related assets [Member]
Dec. 31, 2013
Minimum [Member]
Office equipment, furniture and fixtures and information technology systems [Member]
Dec. 31, 2013
Maximum [Member]
Buildings and leasehold improvements [Member]
Dec. 31, 2013
Maximum [Member]
Operating equipment and vehicles [Member]
Dec. 31, 2013
Maximum [Member]
Fiber optic and related assets [Member]
Dec. 31, 2013
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     5 years 5 years 5 years 3 years 30 years 25 years 20 years 15 years
Land $ 30,743 $ 16,101                
Buildings and leasehold improvements 77,939 59,818                
Operating equipment and vehicles 1,199,807 1,045,248                
Fiber optic and related assets 377,551 350,521                
Office equipment, furniture and fixtures and information technology systems 107,477 95,779                
Construction work in progress 44,030 33,546                
Property and equipment, Gross 1,837,547 1,601,013                
Less - Accumulated depreciation and amortization (631,939) (555,030)                
Property and equipment, net $ 1,205,608 $ 1,045,983