Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (b)(4)

-URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479

Acquisitions - Additional information (Detail) (USD $)			1 Months Ended					1 Months Ended
Acquisitions - Additional information (Detail) (USD $)	Jun. 30, 2013	Dec. 31, 2012	May 06, 2013 Interide Logistics, LC ("Interide Logistics") [Member]	Feb. 26, 2013 Covered Logistics & Transportation LLC ("Covered Logistics") [Member]	Oct. 24, 2012 Turbo Logistics, Inc. [Member]	Jun. 30, 2013 Kelron Logistics, Inc. [Member]	Aug. 03, 2012 Kelron Logistics, Inc. [Member]	Aug. 03, 2012 Kelron Logistics, Inc. [Member] Note Payable to Sellers [Member]	Aug. 03, 2012 Kelron Logistics, Inc. [Member] Minimum [Member] Customer	Jun. 30, 2013 Continental Freight Services, Inc. [Member]	May 08, 2012 Continental Freight Services, Inc. [Member]	May 08, 2012 Continental Freight Services, Inc. [Member] Maximum [Member] Potential Earn-Out [Member]	Feb. 08, 2013 ECAC [Member]
Loans At Acquisition Date [Line Items]
Business Acquisition, Cost of Acquired Entity, Cash Paid			$ 3,100,000	$ 8,000,000	$ 50,100,000						$ 3,500,000		$ 9,300,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares			36,878	173,712
Business Acquisition, Equity Interest Issued or Issuable			600,000	3,000,000
Business Acquisition, Purchase Price Allocation, Goodwill Amount			3,000,000	7,100,000									3,800,000
Business Acquisition, Purchase Price Allocation, Intangible Assets			1,800,000	2,800,000									4,800,000
Business Acquisition, Cost Consideration, Final Working Capital Adjustment					200,000
Business Acquisition, Cost of Acquired Entity, Purchase Price							8,000,000
Business Acquisition, Cost of Acquired Entity, Equity Interests Issued and Issuable							2,600,000
Business Acquisition, Purchase Price Allocation, Liabilities Assumed							5,400,000
Number of customers									750
Business Acquisition, Cost of Acquired Entity, Liabilities Incurred								1,000,000
Fair Value Inputs, Discount Rate								4.53%
Notes payable	1,119,000	863,000				700,000
Business Acquisition, Contingent Consideration, Potential Cash Payment												300,000
Business Acquisition, Contingent Consideration, at Fair Value	$ 443,000	$ 392,000								$ 300,000	$ 300,000