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Business Combinations - Additional Information (Detail) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 USD ($) acquisition | Mar. 31, 2018 USD ($) acquisition | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | $ 115,653,000 |  |  |
Number of acquisitions | acquisition | 8 | 2 |  |
Aggregate purchase price of acquisitions | $ (6,800,000) |  |  |
Payments to Acquire Businesses, Gross | $ 98,299,000 |  |  |
Document Period End Date | Mar. 31, 2019 |  |  |
Goodwill, Acquired During Period | $ 80,432,000 |  |  |
Goodwill assigned | 80,432,000 |  |  |
Goodwill currently deductible for income tax purposes | 62,200,000 |  |  |
Goodwill related to the recorded earn-out payables | 18,200,000 |  |  |
Total revenues related to acquisitions | 4,800,000 |  |  |
Income before income taxes related to acquisitions | 1,000,000.0 |  |  |
Estimated acquisition earn-out payables | 108,710,000 | $ 40,600,000 | $ 89,924,000 | $ 36,175,000
Maximum Future Contingency payments Acquisitions | 218,200,000 |  |  |
Accounts payable |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated acquisition earn-out payables | $ 25,200,000 |  |  |
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 | $ 55,117,000 |  |  |
Goodwill assigned | 55,100,000 |  |  |
National Programs |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill, Acquired During Period | 0 |  |  |
Wholesale Brokerage |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill, Acquired During Period | 6,063,000 |  |  |
Goodwill assigned | 6,100,000 |  |  |
Services [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill, Acquired During Period | 19,252,000 |  |  |
Goodwill assigned | 19,200,000 |  |  |
Other non-current liability |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated acquisition earn-out payables | $ 83,500,000 |  |  |
Business Combinations - Asset Deals [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of acquisitions | acquisition | 7 |  |  |
Other Acquisitions [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | $ 15,619,000 |  |  |
Goodwill assigned | $ 15,911,000 |  |  |
Business Combinations - Stock Deals [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of acquisitions | acquisition | 1 |  |  |

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