Acquisitions - Intangible Assets Acquired (Details) - Command Transportation, LLC |
Jun. 01, 2015
USD ($)
|
|---|---|
| Business Acquisition [Line Items] | |
| Value | $ 125,400,000 |
| Customer relationships | |
| Business Acquisition [Line Items] | |
| Value | $ 97,200,000 |
| Useful Life | 17 years |
| Carrier relationships | |
| Business Acquisition [Line Items] | |
| Value | $ 18,300,000 |
| Useful Life | 17 years |
| Trade names | |
| Business Acquisition [Line Items] | |
| Value | $ 5,000,000 |
| Useful Life | 4 years |
| Noncompete agreements | |
| Business Acquisition [Line Items] | |
| Value | $ 4,900,000 |
| Noncompete agreements | Minimum | |
| Business Acquisition [Line Items] | |
| Useful Life | 5 years |
| Noncompete agreements | Maximum | |
| Business Acquisition [Line Items] | |
| Useful Life | 8 years |