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Pro Forma Effect of Businesses Acquired (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition                      
Revenue, as reported $ 2,469,855 $ 2,465,800 $ 2,458,411 $ 2,342,843 $ 2,150,406 $ 2,207,343 $ 2,304,806 $ 1,921,476 $ 9,736,909 $ 8,584,031 $ 7,192,633
Pro forma revenue                 10,070,904 9,754,548 9,141,688
Income from continuing operations $ 122,870 $ 122,381 $ 150,914 $ 140,809 $ 96,298 $ 109,844 $ 137,810 $ 112,171 536,974 456,123 423,223
Pro forma income from continuing operations                 $ 558,275 $ 494,538 $ 453,963
Basic earnings per share from continuing operations $ 0.40 $ 0.40 $ 0.49 $ 0.46 $ 0.31 $ 0.36 $ 0.45 $ 0.37 $ 1.74 $ 1.49 $ 1.39
Pro forma earnings per share from continuing operations, basic (4)                 1.81 1.61 1.49
Diluted earnings per share from continuing operations $ 0.39 $ 0.39 $ 0.49 $ 0.45 $ 0.31 $ 0.35 $ 0.45 $ 0.36 1.73 1.47 1.38
Pro forma earnings per share from continuing operations, diluted (4)                 $ 1.80 $ 1.60 $ 1.48
Restructuring and acquisition related expenses                 $ 19,672 $ 37,762 $ 19,511
Rhiag                      
Business Acquisition                      
Revenue of purchased businesses for the period prior to acquisition                 0 213,376 994,903
Net income of purchased businesses for the period prior to acquisition, including pro forma purchase accounting adjustments                 $ 0 $ (84) $ 10,310
Effect of purchased businesses for the period prior to acquisition                 $ 0.00 $ 0.00 $ 0.03
Effect of purchased businesses for the period prior to acquisition                 $ 0.00 $ 0.00 $ 0.03
PGW                      
Business Acquisition                      
Pro Forma costs excluded                   $ 5,000 $ 18,000
Revenue of purchased businesses for the period prior to acquisition                 $ 0 102,540 339,012
Net income of purchased businesses for the period prior to acquisition, including pro forma purchase accounting adjustments                 $ 0 $ 7,574 $ 3,334
Effect of purchased businesses for the period prior to acquisition                 $ 0.00 $ 0.02 $ 0.01
Effect of purchased businesses for the period prior to acquisition                 $ 0.00 $ 0.02 $ 0.01
All 2016 Acquisitions Excluding Rhiag and PGW [Member]                      
Business Acquisition                      
Revenue of purchased businesses for the period prior to acquisition                 $ 333,995    
Net income of purchased businesses for the period prior to acquisition, including pro forma purchase accounting adjustments                 $ 15,431    
Effect of purchased businesses for the period prior to acquisition                 $ 0.05    
Effect of purchased businesses for the period prior to acquisition                 $ 0.05    
All 2016 and 2015 Acquisitions Excluding Rhiag and PGW [Member]                      
Business Acquisition                      
Revenue of purchased businesses for the period prior to acquisition                   $ 854,601  
Net income of purchased businesses for the period prior to acquisition, including pro forma purchase accounting adjustments                   $ 19,323  
Effect of purchased businesses for the period prior to acquisition                   $ 0.06  
Effect of purchased businesses for the period prior to acquisition                   $ 0.06  
All 2016 and 2015 Acquisitions Excluding Rhiag and PGW [Member]                      
Business Acquisition                      
Revenue of purchased businesses for the period prior to acquisition                     $ 615,140
Net income of purchased businesses for the period prior to acquisition, including pro forma purchase accounting adjustments                     $ 15,266
Effect of purchased businesses for the period prior to acquisition                     $ 0.05
Effect of purchased businesses for the period prior to acquisition                     $ 0.05
All 2017 acquisitions [Member]                      
Business Acquisition                      
Acquisition Related Costs, Net of Tax                 $ 5,870    
Business Acquisition Pro Forma Income Loss From Acquisition Related Costs, Net of Tax, Per Basic Share Effect                 $ 0.02    
Business Acquisition Pro Forma Income Loss From Acquisition Related Costs, Net of Tax, Per Diluted Share Effect                 $ 0.02    
All 2016 Acquisitions [Member]                      
Business Acquisition                      
Acquisition Related Costs, Net of Tax                   $ 11,602  
Business Acquisition Pro Forma Income Loss From Acquisition Related Costs, Net of Tax, Per Basic Share Effect                   $ 0.04  
Business Acquisition Pro Forma Income Loss From Acquisition Related Costs, Net of Tax, Per Diluted Share Effect                   $ 0.04  
All 2014 Acquisitions [Member]                      
Business Acquisition                      
Acquisition Related Costs, Net of Tax                     $ 1,830
Business Acquisition Pro Forma Income Loss From Acquisition Related Costs, Net of Tax, Per Basic Share Effect                     $ 0.01
Business Acquisition Pro Forma Income Loss From Acquisition Related Costs, Net of Tax, Per Diluted Share Effect                     $ 0.01
Acquisition related expenses                      
Business Acquisition                      
Restructuring and acquisition related expenses                 $ 15,000 $ 22,000 $ 6,000
Acquisition related expenses | Rhiag                      
Business Acquisition                      
Restructuring and acquisition related expenses                   11,000 $ 2,000
Acquisition related expenses | PGW                      
Business Acquisition                      
Restructuring and acquisition related expenses                   $ 4,000