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Acquisitions - Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenue from continuing operations [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 1,808,950 | $ 1,747,403 | $ 1,798,094 | $ 1,637,671 | $ 1,752,530 | $ 1,747,775 | $ 1,737,371 | $ 1,583,210 | $ 6,992,118 | $ 6,820,886 | $ 6,043,224
Pro forma |  |  |  |  |  |  |  |  | 6,992,434 | 6,858,255 |
Earnings from continuing operations [Abstract] |  |  |  |  |  |  |  |  |  |  |
As reported | $ 157,975 | $ 157,305 | $ 166,456 | $ 109,409 | $ 289,645 | $ 159,455 | $ 142,475 | $ 155,088 | 591,145 | 746,663 | $ 502,128
Pro forma |  |  |  |  |  |  |  |  | $ 594,786 | $ 747,537 |
Basic earnings per share from continuing operations [Abstract] |  |  |  |  |  |  |  |  |  |  |
As reported (in dollars per share) | $ 1.08 | $ 1.07 | $ 1.10 | $ 0.71 | $ 1.86 | $ 1.02 | $ 0.92 | $ 1.00 | $ 3.94 | $ 4.80 | $ 3.23
Pro forma (in dollars per share) |  |  |  |  |  |  |  |  | 3.97 | 4.80 |
Diluted earnings per share from continuing operations [Abstract] |  |  |  |  |  |  |  |  |  |  |
As reported (in dollars per share) | $ 1.07 | $ 1.05 | $ 1.08 | $ 0.70 | $ 1.83 | $ 1.01 | $ 0.90 | $ 0.99 | 3.89 | 4.73 | $ 3.21
Pro forma (in dollars per share) |  |  |  |  |  |  |  |  | $ 3.91 | $ 4.74 |

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