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Statements of Operations Recast for Discontinued Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Jun. 30, 2014
Jun. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2014
Dec. 31, 2013
Income Statement [Abstract]                              
Revenues $ 1,861,386 $ 2,027,614 $ 2,145,958 $ 1,838,209 $ 1,735,448 $ 1,792,147 $ 1,618,049 $ 1,447,263 $ 1,554,118 $ 3,573,657 $ 3,001,381 $ 5,719,615 $ 4,619,430 $ 7,747,229 $ 6,411,577
Cost of services (including depreciation) 1,623,480 1,715,986 1,809,055 1,574,000 1,479,394 1,502,791 1,362,172 1,223,377 1,336,304 3,053,394 2,559,681 4,862,449 3,921,853 6,578,435 5,424,644
Gross profit 237,906 311,628 336,903 264,209 256,054 289,356 255,877 223,886 217,814 520,263 441,700 857,166 697,577 1,168,794 986,933
Selling, general and administrative expenses 145,463 204,884 196,494 135,210 168,889 139,035 120,966 115,163 109,905 304,099 225,068 500,593 346,034 705,477 485,069
Amortization of intangible assets 8,293 9,097 9,125 8,202 7,833 9,697 6,613 4,667 4,888 16,035 9,555 25,160 16,168 34,257 25,865
Operating income 84,150 97,647 131,284 120,797 79,332 140,624 128,298 104,056 103,021 200,129 207,077 331,413 335,375 429,060 475,999
Interest expense (1,400) (1,334) (1,321) (1,128) (982) (1,188) (475) (503) (502) (2,110) (1,005) (3,431) (1,480) (4,765) (2,668)
Interest income 453 695 900 599 1,542 1,150 1,139 568 521 2,141 1,089 3,041 2,228 3,736 3,378
Equity in earnings (losses) of unconsolidated affiliates, including gain on sale of investment       (332)   112,744       (332)   (332)   (332) 112,744
Other income (expense), net (212) (465) (378) (901) 644 558 (825) (352) (514) (257) (866) (635) (1,691) (1,100) (1,133)
Income from continuing operations before income taxes 82,991 96,543 130,485 119,035 80,536 253,888 128,137 103,769 102,526 199,571 206,295 330,056 334,432 426,599 588,320
Provision for income taxes 30,601 31,738 37,195 41,220 28,854 86,967 37,724 36,796 35,388 70,074 72,184 107,269 109,908 139,007 196,875
Net income from continuing operations 52,390 64,805 93,290 77,815 51,682 166,921 90,413 66,973 67,138 129,497 134,111 222,787 224,524 287,592 391,445
Net income from discontinued operations 5,795 6,170 6,725 7,629 6,966 4,396 7,996 7,753 9,719 14,595 17,472 21,320 25,468 27,490 29,864
Net income 58,185 70,975 100,015 85,444 58,648 171,317 98,409 74,726 76,857 144,092 151,583 244,107 249,992 315,082 421,309
Less: Net income attributable to non-controlling interests 4,701 4,399 5,367 4,362 4,240 4,620 5,503 4,489 4,776 8,602 9,265 13,969 14,768 18,368 19,388
Net income attributable to common stock 53,484 66,576 94,648 81,082 54,408 166,697 92,906 70,237 72,081 135,490 142,318 230,138 235,224 296,714 401,921
Amounts attributable to common stock:                              
Net income from continuing operations 47,689 60,406 87,923 73,453 47,442 162,301 84,910 62,484 62,362 120,895 124,846 208,818 209,756 269,224 372,057
Net income (loss) from discontinued operations 5,795 6,170 6,725 7,629 6,966 4,396 7,996 7,753 9,719 14,595 17,472 21,320 25,468 27,490 29,864
Net income attributable to common stock $ 53,484 $ 66,576 $ 94,648 $ 81,082 $ 54,408 $ 166,697 $ 92,906 $ 70,237 $ 72,081 $ 135,490 $ 142,318 $ 230,138 $ 235,224 $ 296,714 $ 401,921
Earnings (loss) per share attributable to common stock - basic:                              
Continuing operations $ 0.22 $ 0.27 $ 0.40 $ 0.33 $ 0.22 $ 0.75 $ 0.39 $ 0.30 $ 0.29 $ 0.55 $ 0.59 $ 0.95 $ 0.98 $ 1.22 $ 1.73
Discontinued operations 0.03 0.03 0.03 0.04 0.03 0.02 0.04 0.03 0.05 0.07 0.08 0.10 0.12 0.13 0.14
Net income attributable to common stock 0.25 0.30 0.43 0.37 0.25 0.77 0.43 0.33 0.34 0.62 0.67 1.05 1.10 1.35 1.87
Earnings (loss) per share attributable to common stock - diluted                              
Continuing operations 0.22 0.27 0.40 0.33 0.22 0.75 0.39 0.30 0.29 0.55 0.59 0.95 0.98 1.22 1.73
Discontinued operations 0.03 0.03 0.03 0.04 0.03 0.02 0.04 0.03 0.05 0.07 0.08 0.10 0.12 0.13 0.14
Net income attributable to common stock $ 0.25 $ 0.30 $ 0.43 $ 0.37 $ 0.25 $ 0.77 $ 0.43 $ 0.33 $ 0.34 $ 0.62 $ 0.67 $ 1.05 $ 1.10 $ 1.35 $ 1.87
Shares used in computing earnings per share:                              
Weighted average basic shares outstanding 215,473 220,451 219,492 219,612 219,033 217,287 214,866 214,314 213,453 219,345 213,833 219,395 214,178 219,668 214,929
Weighted average diluted shares outstanding 215,490 220,472 219,517 219,642 219,075 217,338 214,916 214,368 213,512 219,375 213,886 219,420 214,229 219,690 214,978