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Acquisitions - Narrative (Details)
3 Months Ended
Jun. 01, 2015
USD ($)
Employee_grantedoptions
$ / shares
shares
Mar. 31, 2016
USD ($)
shares
Mar. 31, 2015
USD ($)
shares
Dec. 31, 2015
USD ($)
Business Acquisition [Line Items]        
Goodwill | $   $ 307,314,171   $ 308,490,588
Echo share price | $ / shares $ 32.52      
Marketability discount percentage applied 10.00%      
Stock-based compensation expense | $   $ 5,316,837 $ 1,891,067  
Command Transportation, LLC        
Business Acquisition [Line Items]        
Goodwill | $ $ 225,304,568      
Equity portion of purchase price (shares) 503,829      
Restricted stock        
Business Acquisition [Line Items]        
Grants in period, other than options   222,408 214,832  
Restricted stock | Command Transportation, LLC        
Business Acquisition [Line Items]        
Grants in period, other than options 335,882      
Number of employees granted shares | Employee_grantedoptions 33      
Award vesting period 1 year      
Sellers with new Employment Agreements | Restricted stock | Command Transportation, LLC        
Business Acquisition [Line Items]        
Grants in period, other than options 100,766      
Number of employees granted shares | Employee_grantedoptions 2      
Award vesting period 3 years      
Stock-based compensation expense | $   $ 3,100,000    
Sellers with new Employment Agreements | Performance Shares | Command Transportation, LLC        
Business Acquisition [Line Items]        
Grants in period, other than options 67,178