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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, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 3,210,853 | $ 3,419,253 | $ 3,545,088 | $ 3,300,890 | $ 3,357,202 | $ 3,467,362 | $ 3,502,918 | $ 3,142,585 | $ 13,476,084 | $ 13,470,067 | $ 12,752,076
Revenue, pro forma |  |  |  |  |  |  |  |  |  | 14,093,312 |
Income from operations | $ 214,579 | $ 232,711 | $ 229,095 | $ 181,925 | $ 187,728 | $ 203,337 | $ 200,382 | $ 156,971 | $ 858,310 | 748,418 | $ 682,650
Income from operations, pro forma |  |  |  |  |  |  |  |  |  | 772,549 |
Freightquote |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 623,245 |
Income from operations |  |  |  |  |  |  |  |  |  | $ 24,131 |

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- Definition The pro forma income from continuing operations before changes in accounting and extraordinary items, net of tax effect, for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + Details
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