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

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The amount of identifiable intangible assets recognized as of the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 55
-Paragraph 37
-URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472

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