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Goodwill - Schedule of Goodwill (Detail) (USD $) In Thousands, unless otherwise specified | 6 Months Ended |
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012
Goodwill [Line Items] |  |
Goodwill at beginning of period | $ 55,947 | $ 19,084
Acquisitions and other adjustments | 13,980 |
Goodwill at end of period | 69,927 | 19,084
Expedited Transportation [Member] |  |
Goodwill [Line Items] |  |
Goodwill at beginning of period | 7,737 |
Acquisitions and other adjustments | 3,823 |
Goodwill at end of period | 11,560 |
Freight Forwarding [Member] |  |
Goodwill [Line Items] |  |
Goodwill at beginning of period | 9,222 |
Acquisitions and other adjustments |  |
Goodwill at end of period | 9,222 |
Freight Brokerage [Member] |  |
Goodwill [Line Items] |  |
Goodwill at beginning of period | 38,988 |
Acquisitions and other adjustments | 10,157 |
Goodwill at end of period | $ 49,145 |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of increase (decrease) of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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