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Business Combinations - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) acquisition | Dec. 31, 2016 USD ($) acquisition | Dec. 31, 2015 USD ($) acquisition customer_account | Dec. 31, 2014 USD ($)
Business Acquisition [Line Items] |  |  |  |
Maximum Future Contingency payments Acquisitions | $ 88,400,000 |  |  |
Number of acquisitions | acquisition | 11 | 8 |  |
Aggregate purchase price of acquisitions | $ 1,500,000 | $ 917,497 | $ 503,442 |
Payments to Acquire Businesses, Gross | 41,471,000 | 124,716,000 | 136,000,000.0 |
Goodwill assigned | 42,172,000 | 93,376,000 | 136,381,000 |
Goodwill currently deductible for income tax purposes | 35,300,000 | 88,900,000 | 91,100,000 |
Goodwill currently non-deductible for income tax purposes |  |  | 8,400,000 |
Goodwill related to the recorded earn-out payables | 6,900,000 | 4,500,000 | 36,900,000 |
Total revenues related to acquisitions | 7,800,000 | 34,200,000 | 28,200,000 |
Income before income taxes related to acquisitions | 2,400,000 | 4,300,000 | 1,500,000 |
Estimated acquisition earn-out payables | 36,175,000 | 63,821,000 | 78,387,000 | $ 75,283,000
Other Payable | 11,708,000 | 10,664,000 | 10,028,000 |
Business Acquisitions Contingent Consideration At Fair Value | 6,921,000 | 4,462,000 | 36,899,000 |
Net Assets Acquired | 60,100,000 | 140,334,000 | 182,927,000 |
Maximum Potential Earn- Out Payable | 27,451,000 | 16,285,000 | 73,074,000 |
Accounts payable |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated acquisition earn-out payables | $ 25,100,000 | $ 31,800,000 | $ 25,300,000 |
Purchased customer accounts |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Weighted average life (years) | 15 years | 15 years | 15 years |
Non-compete agreements |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Weighted average life (years) | 5 years | 5 years | 5 years |
National Programs |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill assigned | $ 7,200,000 | $ 57,900,000 | $ 18,000,000.0 |
Wholesale Brokerage [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill assigned | 1,200,000 | (1,200) | 4,600,000 |
Services [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill assigned | 700,000 | 22,400,000 |  |
Other non-current liability |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated acquisition earn-out payables | $ 11,100,000 | 32,000,000.0 | $ 53,100,000 |
Social Security Advocates for the Disabled LLC [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill assigned |  | 22,352,000 |  |
Net Assets Acquired |  | $ 33,989,000 |  |
Social Security Advocates for the Disabled LLC [Member] | Services [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Effective Date of Acquisition |  | Feb. 01, 2016 |  |
Payments to Acquire Businesses, Gross |  | $ 32,526,000 |  |
Other Payable |  | 0 |  |
Business Acquisitions Contingent Consideration At Fair Value |  | 971,000 |  |
Net Assets Acquired |  | 33,989,000 |  |
Maximum Potential Earn- Out Payable |  | 3,500,000 |  |
Morstan General Agency, Inc [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill assigned |  | 51,454,000 |  |
Net Assets Acquired |  | $ 79,341,000 |  |
Morstan General Agency, Inc [Member] | Wholesale Brokerage [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Effective Date of Acquisition |  | Jun. 01, 2016 |  |
Payments to Acquire Businesses, Gross |  | $ 66,050,000 |  |
Other Payable |  | 10,200,000 |  |
Business Acquisitions Contingent Consideration At Fair Value |  | 3,091,000 |  |
Net Assets Acquired |  | 79,341,000 |  |
Maximum Potential Earn- Out Payable |  | $ 5,000,000 |  |
Asset Acquisitions [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of acquisitions | acquisition | 11 | 7 | 13 |
Book of Business Purchases [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of acquisitions | 1 | 3 | 4 |
Other Acquisitions [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill assigned |  |  | $ 21,040,000 |
Net Assets Acquired |  |  | 17,605,000 |
Other Acquisitions [Member] | Various |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Payments to Acquire Businesses, Gross | $ 41,471,000 | $ 26,140,000 | 12,926,000 |
Other Payable | 11,708,000 | 464,000 | 95,000 |
Business Acquisitions Contingent Consideration At Fair Value | 6,921,000 | 400,000 | 4,584,000 |
Net Assets Acquired | 60,100,000 | 27,004,000 | 17,605,000 |
Maximum Potential Earn- Out Payable | $ 27,451,000 | $ 7,785,000 | $ 8,212,000 |

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