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SUPPLEMENTARY DATA (UNAUDITED) Summary of Unaudited Results of Operations for Each Quarter (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ 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
Revenues: |  |  |  |  |  |  |  |  |  |  |
Transportation | $ 2,867,301 | $ 3,044,500 | $ 3,130,722 | $ 2,947,257 | $ 3,014,251 | $ 3,073,382 | $ 3,042,102 | $ 2,806,777 | $ 11,989,780 | $ 11,936,512 | $ 11,082,942
Sourcing | 343,552 | 374,753 | 414,366 | 353,633 | 342,951 | 393,980 | 460,816 | 335,808 | 1,486,304 | 1,533,555 | 1,669,134
Total 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
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |
Purchased transportation and related services | 2,323,376 | 2,484,409 | 2,582,374 | 2,452,112 | 2,536,440 | 2,575,619 | 2,555,959 | 2,376,388 | 9,842,271 | 10,044,406 | 9,373,797
Purchased products sourced for resale | 316,700 | 346,269 | 378,696 | 323,668 | 318,946 | 364,179 | 425,922 | 308,962 | 1,365,333 | 1,418,009 | 1,542,184
Personnel expenses | 268,190 | 264,077 | 263,999 | 255,144 | 235,117 | 244,621 | 238,986 | 220,297 | 1,051,410 | 939,021 | 826,661
Other selling, general, and administrative expenses | 88,008 | 91,787 | 90,924 | 88,041 | 78,971 | 79,606 | 81,669 | 79,967 | 358,760 | 320,213 | 326,784
Total costs and expenses | 2,996,274 | 3,186,542 | 3,315,993 | 3,118,965 | 3,169,474 | 3,264,025 | 3,302,536 | 2,985,614 | 12,617,774 | 12,721,649 | 12,069,426
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
Net income | $ 126,583 | $ 139,432 | $ 137,208 | $ 106,476 | $ 112,947 | $ 124,981 | $ 118,596 | $ 93,187 | $ 509,699 | $ 449,711 | $ 415,904
Basic net income per share (in dollars per share) | $ 0.88 | $ 0.96 | $ 0.94 | $ 0.73 | $ 0.77 | $ 0.85 | $ 0.80 | $ 0.63 | $ 3.52 | $ 3.06 | $ 2.65
Diluted net income per share (in dollars per share) | $ 0.88 | $ 0.96 | $ 0.94 | $ 0.73 | $ 0.77 | $ 0.85 | $ 0.80 | $ 0.63 | $ 3.51 | $ 3.05 | $ 2.65
Basic weighted average shares outstanding (in shares) | 143,484 | 144,578 | 145,515 | 146,204 | 145,856 | 146,646 | 147,826 | 148,517 | 144,967 | 147,202 | 156,915
Dilutive effect of outstanding stock awards (in shares) | 660 | 204 | 164 | 179 | 794 | 210 | 148 | 491 | 382 | 340 | 165
Diluted weighted average shares outstanding (in shares) | 144,144 | 144,782 | 145,679 | 146,383 | 146,650 | 146,856 | 147,974 | 149,008 | 145,349 | 147,542 | 157,080
Market price range of common stock: |  |  |  |  |  |  |  |  |  |  |
High (in dollars per share) | $ 73.34 | $ 71.50 | $ 73.09 | $ 76.18 | $ 77.49 | $ 69.50 | $ 64.09 | $ 60.31 |  |  |
Low (in dollars per share) | $ 59.71 | $ 61.64 | $ 61.46 | $ 67.11 | $ 63.42 | $ 63.09 | $ 51.10 | $ 50.21 |  |  |

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