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Property and Equipment - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Property, Plant and Equipment [Line Items]      
Property and Equipment, gross $ 373,692,000 $ 257,667,000  
Transportation equipment 236,900,000 162,500,000  
Equipment, capital lease obligation     26,400,000
Equipment, capital lease obligation, net 20,000,000 22,600,000  
Depreciation and amortization expense related to property and equipment 20,200,000 19,600,000 14,800,000
Amortization expense under capital lease obligation 2,600,000 2,600,000 1,100,000
Building and improvements [Member]
      
Property, Plant and Equipment [Line Items]      
Property and Equipment, gross 35,212,000 72,000  
Construction in process [Member]
      
Property, Plant and Equipment [Line Items]      
Property and Equipment, gross   $ 6,142,000