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Reportable Segments - Selected Financial Data for Each of Operating Segments (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Segment Reporting Information [Line Items]          
Revenue $ 137,091 $ 54,540 $ 251,090 $ 99,100  
Operating income (loss) from operations (14,015) (3,368) (25,382) (7,592)  
Depreciation and amortization 1,795 423 3,349 741  
Interest expense (income) 3,106 3 6,170 15  
Tax provision (benefit) 74 1,780 296 259  
Goodwill 69,927 19,084 69,927 19,084 55,947
Total assets 394,479 260,731 394,479 260,731 413,208
Freight Brokerage [Member]
          
Segment Reporting Information [Line Items]          
Goodwill 49,145   49,145   38,988
Expedited Transportation [Member]
          
Segment Reporting Information [Line Items]          
Goodwill 11,560   11,560   7,737
Freight Forwarding [Member]
          
Segment Reporting Information [Line Items]          
Goodwill 9,222   9,222   9,222
Operating Segments [Member] | Freight Brokerage [Member]
          
Segment Reporting Information [Line Items]          
Revenue 95,360 13,877 173,590 21,805  
Operating income (loss) from operations (4,990) (825) (8,810) (911)  
Depreciation and amortization 1,180 76 2,194 96  
Interest expense (income) 3   5 1  
Tax provision (benefit)     41    
Goodwill 49,145 2,125 49,145 2,125  
Total assets 208,408 12,899 208,408 12,899  
Operating Segments [Member] | Expedited Transportation [Member]
          
Segment Reporting Information [Line Items]          
Revenue 26,445 25,731 50,320 48,151  
Operating income (loss) from operations 1,187 2,634 1,940 4,422  
Depreciation and amortization 291 129 559 266  
Interest expense (income) 2 1 4 2  
Tax provision (benefit) 2   2    
Goodwill 11,560 7,737 11,560 7,737  
Total assets 63,303 28,953 63,303 28,953  
Operating Segments [Member] | Freight Forwarding [Member]
          
Segment Reporting Information [Line Items]          
Revenue 19,338 16,468 35,571 31,925  
Operating income (loss) from operations 478 218 850 459  
Depreciation and amortization 93 145 181 289  
Interest expense (income)   1      
Goodwill 9,222 9,222 9,222 9,222  
Total assets 31,088 22,920 31,088 22,920  
Operating Segments [Member] | Corporate [Member]
          
Segment Reporting Information [Line Items]          
Revenue 0        
Operating income (loss) from operations (10,690) (5,395) (19,362) (11,562)  
Depreciation and amortization 231 73 415 90  
Interest expense (income) 3,101 1 6,161 12  
Tax provision (benefit) 72 1,780 253 259  
Total assets 422,672 237,335 422,672 237,335  
Operating Segments [Member] | Eliminations [Member]
          
Segment Reporting Information [Line Items]          
Revenue (4,052) (1,536) (8,391) (2,781)  
Total assets $ (330,992) $ (41,376) $ (330,992) $ (41,376)