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Summary of Operating Results (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 1,162,576 | $ 1,054,360 | $ 924,513 | $ 893,448 | $ 978,560 | $ 932,814 | $ 855,557 | $ 805,859 | $ 4,034,897 | $ 3,572,790 | $ 3,525,595
Transportation costs |  |  |  |  |  |  |  |  | 3,577,380 | 3,118,005 | 3,112,900
Gross margin | 138,091 | 116,524 | 101,317 | 101,585 | 120,454 | 111,454 | 114,490 | 108,387 | 457,517 | 454,785 | 412,695
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |
Salaries and benefits |  |  |  |  |  |  |  |  | 188,389 | 180,459 | 158,938
Agent fees and commissions |  |  |  |  |  |  |  |  | 74,082 | 72,896 | 68,724
General and administrative |  |  |  |  |  |  |  |  | 85,182 | 68,630 | 60,015
Depreciation and amortization |  |  |  |  |  |  |  |  | 13,313 | 8,966 | 7,988
Total costs and expenses |  |  |  |  |  |  |  |  | 360,966 | 330,951 | 295,665
Operating income | $ 41,127 | $ 21,669 | $ 16,578 | $ 17,177 | $ 30,839 | $ 29,855 | $ 34,297 | $ 28,843 | 96,551 | 123,834 | 117,030
Capital expenditures |  |  |  |  |  |  |  |  | 74,541 | 107,409 | 83,042
Operating Segments [Member] | Hub [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 3,107,394 | 2,734,541 | 2,679,318
Transportation costs |  |  |  |  |  |  |  |  | 2,771,291 | 2,404,946 | 2,385,197
Gross margin |  |  |  |  |  |  |  |  | 336,103 | 329,595 | 294,121
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |
Salaries and benefits |  |  |  |  |  |  |  |  | 174,573 | 165,136 | 143,993
Agent fees and commissions |  |  |  |  |  |  |  |  | 58 | 66 | 56
General and administrative |  |  |  |  |  |  |  |  | 77,085 | 60,811 | 53,023
Depreciation and amortization |  |  |  |  |  |  |  |  | 12,139 | 7,698 | 6,688
Total costs and expenses |  |  |  |  |  |  |  |  | 263,855 | 233,711 | 203,760
Operating income |  |  |  |  |  |  |  |  | 72,248 | 95,884 | 90,361
Capital expenditures |  |  |  |  |  |  |  |  | 73,772 | 106,316 | 79,860
Operating Segments [Member] | Mode LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,029,160 | 948,735 | 928,661
Transportation costs |  |  |  |  |  |  |  |  | 907,746 | 823,545 | 810,087
Gross margin |  |  |  |  |  |  |  |  | 121,414 | 125,190 | 118,574
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |
Salaries and benefits |  |  |  |  |  |  |  |  | 13,816 | 15,323 | 14,945
Agent fees and commissions |  |  |  |  |  |  |  |  | 74,024 | 72,830 | 68,668
General and administrative |  |  |  |  |  |  |  |  | 8,097 | 7,819 | 6,992
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,174 | 1,268 | 1,300
Total costs and expenses |  |  |  |  |  |  |  |  | 97,111 | 97,240 | 91,905
Operating income |  |  |  |  |  |  |  |  | 24,303 | 27,950 | 26,669
Capital expenditures |  |  |  |  |  |  |  |  | 769 | 1,093 | 3,182
Intersegment Elims [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | (101,657) | (110,486) | (82,384)
Transportation costs |  |  |  |  |  |  |  |  | $ (101,657) | $ (110,486) | $ (82,384)

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