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Summary of Operating Results (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 978,560 | $ 932,814 | $ 855,557 | $ 805,859 | $ 890,272 | $ 899,869 | $ 899,513 | $ 835,941 | $ 3,572,790 | $ 3,525,595 | $ 3,571,126
Transportation costs |  |  |  |  |  |  |  |  | 3,118,005 | 3,112,900 | 3,200,691
Gross margin | 120,454 | 111,454 | 114,490 | 108,387 | 116,774 | 105,064 | 101,729 | 89,128 | 454,785 | 412,695 | 370,435
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |
Salaries and benefits |  |  |  |  |  |  |  |  | 180,459 | 158,938 | 136,480
Agent fees and commissions |  |  |  |  |  |  |  |  | 72,896 | 68,724 | 62,041
General and administrative |  |  |  |  |  |  |  |  | 68,630 | 60,015 | 58,014
Depreciation and amortization |  |  |  |  |  |  |  |  | 8,966 | 7,988 | 7,799
Driver settlements and related costs |  |  |  |  |  |  |  |  |  |  | 10,343
Impairment of software |  |  |  |  |  |  |  |  |  |  | 11,881
Total costs and expenses |  |  |  |  |  |  |  |  | 330,951 | 295,665 | 286,558
Operating income | $ 30,839 | $ 29,855 | $ 34,297 | $ 28,843 | $ 35,341 | $ 33,418 | $ 29,476 | $ 18,795 | 123,834 | 117,030 | 83,877
Capital expenditures |  |  |  |  |  |  |  |  | 107,409 | 83,042 | 119,171
Operating Segments [Member] | Hub [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 2,734,541 | 2,679,318 | 2,722,799
Transportation costs |  |  |  |  |  |  |  |  | 2,404,946 | 2,385,197 | 2,461,144
Gross margin |  |  |  |  |  |  |  |  | 329,595 | 294,121 | 261,655
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |
Salaries and benefits |  |  |  |  |  |  |  |  | 165,136 | 143,993 | 122,097
Agent fees and commissions |  |  |  |  |  |  |  |  | 66 | 56 | 45
General and administrative |  |  |  |  |  |  |  |  | 60,811 | 53,023 | 51,108
Depreciation and amortization |  |  |  |  |  |  |  |  | 7,698 | 6,688 | 6,238
Driver settlements and related costs |  |  |  |  |  |  |  |  |  |  | 10,343
Impairment of software |  |  |  |  |  |  |  |  |  |  | 11,881
Total costs and expenses |  |  |  |  |  |  |  |  | 233,711 | 203,760 | 201,712
Operating income |  |  |  |  |  |  |  |  | 95,884 | 90,361 | 59,943
Capital expenditures |  |  |  |  |  |  |  |  | 106,316 | 79,860 | 118,640
Operating Segments [Member] | Mode LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 948,735 | 928,661 | 931,131
Transportation costs |  |  |  |  |  |  |  |  | 823,545 | 810,087 | 822,351
Gross margin |  |  |  |  |  |  |  |  | 125,190 | 118,574 | 108,780
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |
Salaries and benefits |  |  |  |  |  |  |  |  | 15,323 | 14,945 | 14,383
Agent fees and commissions |  |  |  |  |  |  |  |  | 72,830 | 68,668 | 61,996
General and administrative |  |  |  |  |  |  |  |  | 7,819 | 6,992 | 6,906
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,268 | 1,300 | 1,561
Total costs and expenses |  |  |  |  |  |  |  |  | 97,240 | 91,905 | 84,846
Operating income |  |  |  |  |  |  |  |  | 27,950 | 26,669 | 23,934
Capital expenditures |  |  |  |  |  |  |  |  | 1,093 | 3,182 | 531
Intersegment Elims [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | (110,486) | (82,384) | (82,804)
Transportation costs |  |  |  |  |  |  |  |  | $ (110,486) | $ (82,384) | $ (82,804)

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