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Business Combinations - Additional Information (Details) $ in Thousands, € in Millions, £ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |
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Sep. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Jun. 30, 2017 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 GBP (£) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 EUR (€) | Dec. 31, 2016 EUR (€) | Mar. 31, 2016 EUR (€)
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Businesses Acquired |  |  |  |  |  |  | 21 |  |  |  |  |  |  |  |  |
Acquisitions, net of cash acquired |  |  |  |  |  |  | $ (252,667) | $ (1,301,127) |  |  |  |  |  |  |  |
Gains on bargain purchases | $ 913 |  | $ 8,000 | $ 0 |  |  | 3,990 | 0 | $ 11,000 |  |  |  |  |  |  |
Gains on foreign exchange contracts - acquisition related | 0 |  |  | 0 |  |  | 0 | (18,342) |  |  |  |  |  |  |  |
Goodwill | $ 3,392,363 |  | 3,054,769 |  |  |  | $ 3,392,363 |  | $ 3,392,363 |  |  |  | $ 3,054,769 |  |  |
Possible divestiture of branches due to acquisition | 10 |  |  |  |  |  | 10 |  | 10 |  |  |  |  |  |  |
Inventory step-up adjustment - acquisition related |  |  |  | 12 |  |  |  | 3,614 |  |  |  |  |  |  |  |
Restructuring and acquisition related expenses | $ 4,922 |  |  | 6,923 |  |  | $ 10,371 | 30,814 |  |  |  |  |  |  |  |
Acquisition-related expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and acquisition related expenses | 3,000 |  |  | $ 3,000 |  |  | $ 8,000 | 18,000 |  |  |  |  |  |  |  |
North America |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Businesses Acquired |  |  |  |  |  |  | 4 |  |  |  |  | 5 | 5 | 5 |  |
Specialty |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Businesses Acquired |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |
Goodwill | 298,352 |  | 292,993 |  |  |  | $ 298,352 |  | $ 298,352 |  |  |  | $ 292,993 |  |  |
Europe |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Businesses Acquired |  |  |  |  |  |  | 14 |  |  |  |  |  |  |  |  |
Goodwill | 1,391,389 |  | 1,099,976 |  |  |  | $ 1,391,389 |  | 1,391,389 |  |  |  | 1,099,976 |  |  |
Andrew Page |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  |  |  |  |  |  |  |  | £ 16 | 20,000 |  |  |
Gains on bargain purchases | 3,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
All 2017 Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  |  |  | 280,000 |  |  |  |  |  |  |  |  |
Acquisitions, net of cash acquired |  |  |  |  |  |  | (250,000) |  |  |  |  |  |  |  |  |
Contingent consideration liabilities | (6,234) |  |  |  |  |  | (6,234) |  | (6,234) |  |  |  |  |  |  |
Business Combincation, Contingent Consideration Arrangements, Maximum Potential Consideration | 18,900 |  |  |  |  |  | 18,900 |  | 18,900 |  |  |  |  |  |  |
Other Purchase Price Obligations (non-interest bearing) | 4,308 |  |  |  |  |  | 4,308 |  | 4,308 |  |  |  |  |  |  |
Notes issued | (18,899) |  |  |  |  |  | (18,899) |  | (18,899) |  |  |  |  |  |  |
Settlement of pre-existing balances | 1,000 |  |  |  |  |  | 1,000 |  | 1,000 |  |  |  |  |  |  |
Goodwill | 185,000 |  |  |  |  |  | 185,000 |  | 185,000 |  |  |  |  |  |  |
Business Acquisition, Goodwill, Expected Tax Deductible Amount | $ 20,000 |  |  |  |  |  | 20,000 |  | $ 20,000 |  |  |  |  |  |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  |  |  |  |  |  | 106,000 |  |  |  |  |  |  |  |  |
Business Combination, Pro Forma Information, Operating Income or Loss of Acquiree since Acquisition Date, Actual |  |  |  |  |  |  | (2,000) |  |  |  |  |  |  |  |  |
PGW |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions, net of cash acquired |  |  |  |  |  |  |  |  |  |  |  |  | (661,748) |  |  |
Notes issued |  |  | 0 |  |  |  |  |  |  |  |  |  | 0 |  |  |
Other purchase price obligations |  |  | 0 |  |  |  |  |  |  |  |  |  | 0 |  |  |
Settlement of pre-existing balances |  |  | 0 |  |  |  |  |  |  |  |  |  | 0 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Debt |  |  | 4,027 |  |  |  |  |  |  |  |  |  | 4,027 |  |  |
Goodwill |  |  | 205,058 |  |  | $ 208,000 |  |  |  | $ 208,000 |  |  | 205,058 |  |  |
Business Acquisition, Goodwill, Expected Tax Deductible Amount |  |  |  |  |  | 104,000 |  |  |  | 104,000 |  |  |  |  |  |
Goodwill, Purchase Accounting Adjustments |  |  |  |  |  |  |  |  |  | 24,000 |  |  |  |  |  |
Inventory step-up adjustment - acquisition related |  |  |  |  |  |  |  |  |  |  |  |  | 10,000 |  |  |
PGW | Acquisition-related expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and acquisition related expenses |  |  |  |  |  |  |  | 4,000 |  |  |  |  |  |  |  |
Rhiag |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  |  |  |  |  |  |  |  |  | 602,000 | € 534 |  |
Acquisitions, net of cash acquired |  |  |  |  |  |  |  |  |  |  |  |  | (601,416) | € (534) |  |
Notes issued |  |  | 0 |  |  |  |  |  |  |  |  |  | 0 |  |  |
Other purchase price obligations |  |  | 0 |  |  |  |  |  |  |  |  |  | 0 |  |  |
Settlement of pre-existing balances |  |  | 591 |  |  |  |  |  |  |  |  |  | 591 |  | € 1 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Debt |  |  | 550,843 |  |  |  |  |  |  |  |  |  | 550,843 |  | € 489 |
Gains on foreign exchange contracts - acquisition related |  |  |  |  | $ (18,000) |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 591,000 | 585,415 |  |  |  |  |  |  |  | $ 591,000 |  | 585,415 |  |  |
Goodwill, Purchase Accounting Adjustments |  |  |  |  |  |  |  |  |  |  | 149,000 |  |  |  |  |
Rhiag | Acquisition-related expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and acquisition related expenses |  |  |  |  |  |  |  | $ 11,000 |  |  |  |  |  |  |  |
Rhiag | Forward Contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount | € |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 588
All 2016 Acquisitions Excluding Rhiag PGW and Andrew Page |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  |  |  |  |  |  |  |  |  | 76,000 |  |  |
Acquisitions, net of cash acquired |  |  |  |  |  |  |  |  |  |  |  |  | (68,000) |  |  |
Notes issued |  |  | (4,000) |  |  |  |  |  |  |  |  |  | (4,000) |  |  |
Other purchase price obligations |  |  | 4,200 |  |  |  |  |  |  |  |  |  | $ 4,200 |  |  |
All 2016 Acquisitions Excluding Rhiag PGW and Andrew Page | Europe |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Businesses Acquired |  |  |  |  |  |  |  |  |  |  |  | 7 | 7 | 7 |  |
Adjustments in 2016 | PGW |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | 205,000 |  |  |  |  |  |  |  |  |  | $ 205,000 |  |  |
Adjustments in 2016 | Rhiag |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | $ 585,000 |  |  |  |  |  |  |  |  |  | $ 585,000 |  |  |
Adjustments in 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gains on bargain purchases |  |  |  |  |  |  | 3,000 |  |  |  |  |  |  |  |  |
Adjustments in 2017 | All 2017 Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, Purchase Accounting Adjustments |  |  |  |  |  |  | $ 11,000 |  |  |  |  |  |  |  |  |
Adjustments in 2017 | PGW |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | 3,000 |  |  |  | $ 3,000 |  |  |  |  |  |
Goodwill, Purchase Accounting Adjustments |  |  |  |  |  | $ 3,000 |  |  |  |  |  |  |  |  |  |
Adjustments in 2017 | Rhiag |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | 5,000 |  |  |  |  |  |  |  |  | $ 5,000 |  |  |  |  |
Goodwill, Purchase Accounting Adjustments |  | $ 5,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair value of the notes payable incurred by the acquirer to former owners of the acquirees as a result of the business combinations during the period. + References No definition available. + Details
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- Definition This element represents the amount of any measurement period adjustment (as defined), realized during the reporting period to inventory acquired in connection with a business combination. + References No definition available. + Details
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- Definition This element represents the amount of operating income or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References No definition available. + Details
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- Definition Possible divestiture of branches due to Governmental review of the acquisition based on competition rules + References No definition available. + Details
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- Definition Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations. Additionally, this element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References No definition available. + Details
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- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition In a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred (as defined), this element represents the amount of gain recognized by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6393-128476 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6527-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (f)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6571-128477 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6387-128476 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6396-128476 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463 + Details
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- Definition Amount before tax of foreign currency transaction realized gain (loss) recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=64836518&loc=d3e30690-110894 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64836518&loc=d3e30700-110894 + Details
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