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Summary of Operating Results (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 801,023 | $ 804,888 | $ 778,312 | $ 739,885 | $ 762,775 | $ 752,179 | $ 751,201 | $ 485,379 | $ 3,124,108 | $ 2,751,534 | $ 1,833,737
Transportation costs |  |  |  |  |  |  |  |  | 2,768,042 | 2,438,986 | 1,620,304
Gross margin | 93,379 | 91,587 | 87,358 | 83,742 | 83,811 | 86,701 | 84,729 | 57,307 | 356,066 | 312,548 | 213,433
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |
Salaries and benefits |  |  |  |  |  |  |  |  | 129,143 | 121,044 | 99,138
Agent fees and commissions |  |  |  |  |  |  |  |  | 55,112 | 41,491 | 2,410
General and administrative |  |  |  |  |  |  |  |  | 52,832 | 49,951 | 38,211
Depreciation and amortization |  |  |  |  |  |  |  |  | 6,619 | 5,603 | 3,792
Total costs and expenses |  |  |  |  |  |  |  |  | 243,706 | 218,089 | 143,551
Operating income | 31,648 | 30,351 | 27,850 | 22,511 | 27,138 | 26,643 | 23,918 | 16,760 | 112,360 | 94,459 | 69,882
Capital expenditures |  |  |  |  |  |  |  |  | 56,882 | 55,010 | 25,616
Hub |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 2,392,289 | 2,183,914 | 1,833,737
Transportation costs |  |  |  |  |  |  |  |  | 2,128,942 | 1,939,263 | 1,620,304
Gross margin |  |  |  |  |  |  |  |  | 263,347 | 244,651 | 213,433
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |
Salaries and benefits |  |  |  |  |  |  |  |  | 113,855 | 107,378 | 99,138
Agent fees and commissions |  |  |  |  |  |  |  |  | 1,900 | 2,771 | 2,410
General and administrative |  |  |  |  |  |  |  |  | 45,411 | 42,523 | 38,211
Depreciation and amortization |  |  |  |  |  |  |  |  | 4,448 | 3,975 | 3,792
Total costs and expenses |  |  |  |  |  |  |  |  | 165,614 | 156,647 | 143,551
Operating income |  |  |  |  |  |  |  |  | 97,733 | 88,004 | 69,882
Capital expenditures |  |  |  |  |  |  |  |  | 54,266 | 54,683 | 25,616
Mode |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 779,928 | 586,251 |
Transportation costs |  |  |  |  |  |  |  |  | 687,209 | 518,354 |
Gross margin |  |  |  |  |  |  |  |  | 92,719 | 67,897 |
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |
Salaries and benefits |  |  |  |  |  |  |  |  | 15,288 | 13,666 |
Agent fees and commissions |  |  |  |  |  |  |  |  | 53,212 | 38,720 |
General and administrative |  |  |  |  |  |  |  |  | 7,421 | 7,428 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 2,171 | 1,628 |
Total costs and expenses |  |  |  |  |  |  |  |  | 78,092 | 61,442 |
Operating income |  |  |  |  |  |  |  |  | 14,627 | 6,455 |
Capital expenditures |  |  |  |  |  |  |  |  | 2,616 | 327 |
Intersegment Elims |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | (48,109) | (18,631) |
Transportation costs |  |  |  |  |  |  |  |  | $ (48,109) | $ (18,631) |

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