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Business Segments (Schedule Of Revenue By Segment And Business Line) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Revenue | $ 762,775 | $ 752,179 | $ 751,201 | $ 485,379 | $ 479,913 | $ 478,417 | $ 458,113 | $ 417,294 | $ 2,751,534 | $ 1,833,737 | $ 1,510,970
Hub [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 2,183,914 | 1,833,737 | 1,510,970
Mode [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 586,251 |  |
Inter-Segment Elims [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | (18,631) |  |
Intermodal [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,795,289 | 1,285,163 | 1,054,862
Intermodal [Member] | Hub [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,553,594 | 1,285,163 | 1,054,862
Intermodal [Member] | Mode [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 258,087 |  |
Intermodal [Member] | Inter-Segment Elims [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | (16,392) |  |
Truck Brokerage [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 576,829 | 335,000 | 292,639
Truck Brokerage [Member] | Hub [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 339,444 | 335,000 | 292,639
Truck Brokerage [Member] | Mode [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 238,418 |  |
Truck Brokerage [Member] | Inter-Segment Elims [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | (1,033) |  |
Logistics [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 379,416 | 213,574 | 163,469
Logistics [Member] | Hub [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 290,876 | 213,574 | 163,469
Logistics [Member] | Mode [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 89,746 |  |
Logistics [Member] | Inter-Segment Elims [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ (1,206) |  |

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- Definition Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 1 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
Name: | us-gaap_SalesRevenueServicesNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration