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ACQUISITIONS - Business Acquisition, Pro Forma Infomration (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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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
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 3,414,975 | $ 3,355,754 | $ 3,299,741 | $ 3,073,943 | $ 3,210,853 | $ 3,419,253 | $ 3,545,088 | $ 3,300,890 | $ 13,144,413 | $ 13,476,084 | $ 13,470,067
Revenue, pro forma |  |  |  |  |  |  |  |  |  |  | 14,093,312
Income from operations | $ 193,565 | $ 211,267 | $ 233,747 | $ 198,952 | $ 214,579 | $ 232,711 | $ 229,095 | $ 181,925 | $ 837,531 | $ 858,310 | 748,418
Income from operations, pro forma |  |  |  |  |  |  |  |  |  |  | 772,549
Freightquote |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 623,245
Income from operations |  |  |  |  |  |  |  |  |  |  | $ 24,131

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