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Business Combinations - Additional Information (Detail) | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) acquisition | Sep. 30, 2017 USD ($) acquisition | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | $ 343,150,000 |  |  |  |  |
Number of acquisitions | acquisition | 18 | 6 |  |  |  |
Aggregate purchase price of acquisitions | $ 21,400 |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 265,890,000 |  |  |  |  |
Document Period End Date | Sep. 30, 2018 |  |  |  |  |
Goodwill, Acquired During Period | $ 214,559,000 |  |  |  |  |
Goodwill assigned | 214,559,000 |  |  |  |  |
Goodwill currently deductible for income tax purposes | 162,900,000 |  |  |  |  |
Goodwill related to the recorded earn-out payables | 51,700,000 |  |  |  |  |
Total revenues related to acquisitions | 29,200,000 |  |  |  |  |
Income before income taxes related to acquisitions | 1,800,000 |  |  |  |  |
Estimated acquisition earn-out payables | 65,308,000 | $ 34,174,000 | $ 52,540,000 | $ 36,175,000 | $ 57,943,000 | $ 63,821,000
Maximum Future Contingency payments Acquisitions | 151,600,000 |  |  |  |  |
Accounts payable |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Estimated acquisition earn-out payables | $ 14,100,000 |  |  |  |  |
Purchased customer accounts |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Weighted average life (years) | 15 years |  |  |  |  |
Non-compete agreements |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Weighted average life (years) | 5 years |  |  |  |  |
Services |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill, Acquired During Period | $ 173,025,000 |  |  |  |  |
Goodwill assigned | 173,000,000.0 |  |  |  |  |
National Programs |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill, Acquired During Period | 18,737,000 |  |  |  |  |
Goodwill assigned | 18,700,000 |  |  |  |  |
Wholesale Brokerage |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill, Acquired During Period | 5,524,000 |  |  |  |  |
Goodwill assigned | 5,500,000 |  |  |  |  |
Services [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill, Acquired During Period | 17,273,000 |  |  |  |  |
Goodwill assigned | 17,300,000 |  |  |  |  |
Other non-current liability |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Estimated acquisition earn-out payables | $ 51,200,000 |  |  |  |  |
Business Combinations - Asset Deals [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of acquisitions | acquisition | 15 |  |  |  |  |
Other Acquisitions [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | $ 33,523,000 |  |  |  |  |
Number of acquisitions | acquisition | 1 |  |  |  |  |
Goodwill assigned | $ 20,245,000 |  |  |  |  |
Business Combinations - Stock Deals [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of acquisitions | acquisition | 3 |  |  |  |  |

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