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Property and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]    
Property and Equipment, gross $ 373,692 $ 257,667
Less: Accumulated depreciation and amortization (113,292) (100,083)
Property and Equipment, net 260,400 157,584
Land [Member]
   
Property, Plant and Equipment [Line Items]    
Property and Equipment, gross 9,855 9,855
Building and improvements [Member]
   
Property, Plant and Equipment [Line Items]    
Property and Equipment, gross 35,212 72
Leasehold improvements [Member]
   
Property, Plant and Equipment [Line Items]    
Property and Equipment, gross 4,245 4,621
Computer equipment and software [Member]
   
Property, Plant and Equipment [Line Items]    
Property and Equipment, gross 74,751 65,515
Furniture and equipment [Member]
   
Property, Plant and Equipment [Line Items]    
Property and Equipment, gross 12,729 9,001
Transportation equipment [Member]
   
Property, Plant and Equipment [Line Items]    
Property and Equipment, gross 236,900 162,461
Construction in process [Member]
   
Property, Plant and Equipment [Line Items]    
Property and Equipment, gross   $ 6,142