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Business Combinations - Additional Information (Details)
$ in Thousands, € in Billions
3 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Apr. 09, 2018
EUR (€)
Dec. 10, 2017
EUR (€)
shares
Business Acquisition          
Income from continuing operations   $ 140,809      
Number of acquisitions     26    
Cash used in acquisitions, net of cash acquired $ 2,966 77,056      
Goodwill 3,572,198   $ 3,536,511    
Pending Acquisition, Enterprise Value | €         € 1.5
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares         8,055,569
Restructuring and acquisition related expenses $ 4,054 2,928      
Disposal Group, Including Discontinued Operation, Revenue   111,130      
Disposal Groups, including Discontinued Operations, Operating income   $ 2,677      
Wholesale Distribution Businesses in North America [Member]          
Business Acquisition          
Number of acquisitions 1        
Europe          
Business Acquisition          
Number of acquisitions     16    
Goodwill $ 1,457,667   $ 1,414,898    
North America Segment [Member]          
Business Acquisition          
Number of acquisitions     6    
North America          
Business Acquisition          
Goodwill 1,707,047   $ 1,709,354    
Specialty          
Business Acquisition          
Number of acquisitions     4    
Goodwill $ 407,484   $ 412,259    
Wholesale Distribution Businesses in Belgium [Member]          
Business Acquisition          
Number of acquisitions     4    
All 2017 acquisitions [Member]          
Business Acquisition          
Total acquisition date fair value of the consideration for acquisitions     $ 542,000    
Cash used in acquisitions, net of cash acquired     510,000    
Notes issued     20,187    
Goodwill     307,000    
Business Acquisition, Goodwill, Expected Tax Deductible Amount     21,000    
Business Combincation, Contingent Consideration Arrangements, Maximum Potential Consideration     19,000    
2017 acquisitions and adjustments to 2016 acquisitions [Member]          
Business Acquisition          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment     41,039    
Cash used in acquisitions, net of cash acquired     513,088    
Gains on bargain purchases     (3,870)    
Notes issued     20,187    
Other purchase price obligations     5,074    
Settlement of pre-existing balances     242    
Goodwill     314,817    
Debt assumed     33,586    
Contingent consideration liabilities     (6,234)    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets     (295)    
Andrew Page          
Business Acquisition          
Gains on bargain purchases     (2,000)    
Adjustments in 2017 [Member] | Rhiag          
Business Acquisition          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment     6,000    
Adjustments in 2017 [Member] | PGW          
Business Acquisition          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets     $ 3,000    
Euro Notes 2026/28 [Member]          
Business Acquisition          
Debt Instrument, Face Amount | €       € 1.0