Acquisitions - Narrative (Details)
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1 Months Ended |
3 Months Ended |
6 Months Ended |
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Jun. 01, 2015
USD ($)
Employee_grantedoptions
$ / shares
shares
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Jun. 30, 2015
USD ($)
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Jun. 30, 2016
USD ($)
shares
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Mar. 31, 2016
USD ($)
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Jun. 30, 2015
USD ($)
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Jun. 30, 2016
USD ($)
shares
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Jun. 30, 2015
USD ($)
shares
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Dec. 31, 2015
USD ($)
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| Business Acquisition [Line Items] |
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| Echo share price | $ / shares |
$ 32.52
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| Marketability discount percentage applied |
10.00%
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| Goodwill |
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$ 307,314,171
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$ 307,314,171
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$ 308,490,588
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| Contingent asset due from seller |
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32,006
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(32,006)
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$ 0
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| Receipt of contingent consideration due from seller |
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750,000
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750,000
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0
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| Stock-based compensation expense |
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3,793,083
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$ 2,613,768
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$ 9,109,921
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$ 4,504,835
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| Restricted stock |
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| Business Acquisition [Line Items] |
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| Grants in period, other than options (in shares) | shares |
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236,375
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674,947
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| Contingent consideration |
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| Business Acquisition [Line Items] |
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| Contingent consideration receivable |
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$ 400,000
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$ 400,000
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| Contingent consideration | Maximum |
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| Business Acquisition [Line Items] |
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| Contingent consideration receivable |
$ 1,500,000
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| Command Transportation, LLC |
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| Business Acquisition [Line Items] |
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| Fair value of total consideration transferred |
$ 407,706,392
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| Equity portion of purchase price (in shares) | shares |
503,829
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| Goodwill |
$ 225,304,568
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| Contingent asset due from seller |
$ (1,176,417)
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$ (1,200,000)
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| Command Transportation, LLC | Restricted stock |
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| Business Acquisition [Line Items] |
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| Grants in period, other than options (in shares) | shares |
335,882
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| Number of employees granted shares | Employee_grantedoptions |
33
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| Command Transportation, LLC | Restricted stock | Sellers with new Employment Agreements |
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| Business Acquisition [Line Items] |
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| Grants in period, other than options (in shares) | shares |
100,766
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| Number of employees granted shares | Employee_grantedoptions |
2
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| Award vesting period |
3 years
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| Number of shares of restricted common stock and performance stock outstanding | shares |
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33,588
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33,588
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| Stock-based compensation expense |
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$ 1,000,000
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$ 2,100,000
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$ 5,200,000
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| Command Transportation, LLC | Performance Shares | Sellers with new Employment Agreements |
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| Business Acquisition [Line Items] |
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| Grants in period, other than options (in shares) | shares |
67,178
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| Number of shares of restricted common stock and performance stock outstanding | shares |
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33,589
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33,589
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